Discover Top Developer Profiles

Our directory at Upstaff.com showcases a talented group of developers, each bringing a wealth of expertise to the table.

  • With profiles highlighting skills in IT development, AI, design, sales, marketing, admin, and customer support, our developers stand out for their rigorous vetting and diverse technical proficiencies. Ranging from seasoned experts with over a decade of experience to skilled mid-level professionals, they excel in languages like JavaScript, Python, and React, tackling complex projects with precision.
  • Hailing from various regions, including Europe, LatAm, Israel, and the United States, our developers offer a global perspective, ensuring adaptability and high-quality work across industries.

Each profile reflects a commitment to excellence, validated through thorough technical assessments and communication evaluations, making them reliable partners for any project.

Python 5yr.
Django 3yr.
Mobile development
Flask
API
FastAPl 5yr.
QA Automation 3yr.
Parse 2yr.
RPA 2yr.
DDOS protection
Solidity
Threads
Aiogram
AsyncIO
pytest
Tortoise ORM
Web3.py
CSS
HTML
FastAPI
Mini-Apps
NestJS
Node.js
React
MariaDB
MongoDB
MySQL
PostgreSQL
Redis
SQL
SQL Alchemy
SQLAlchemy
pyTelegramBotAPI
RESTful API
Telegram API
Celery
Kafka
Crypto Services
TON
TonKeeper
Web3
cyber security
Selenium
Docker
Kubernetes
FDD
serverless
Jinja2
Project Management
Telegram Mini Apps
Ubuntu
VPN
BATM
Multiprocessing
...

- Python Developer with 5+ years of experience in backend development and automation: Django (3 years), Flask, and Fast API for web application development; - Maintaining and supporting production systems using FastAPI and SQLAlchemy, API integrations including financial services and crypto platforms; - Built and supported Telegram bots and automation tools for business operations; - Docker containerization: Docker-compose, Docker via Render (serverless). Deployment and Linux server management (Ubuntu); - Familiar with data reporting and basic analytics through internal monitoring tools; - Open to part-time and distributed team environments with a focus on ongoing system support. - Reached the Top 10 freelance Python engineers on the local market at the age of 17 (showcasing early talent and initiative). - Worked on projects with a multi-million user base, contributing to scalable architecture and high-load system stability. - Successfully launched an educational platform in the USA, now actively used by students, tutors, and academic institutions. - Represented the dev team at the international Wefi Beyond Banking Summit, delivering a product presentation to a global fintech audience.

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Seniority Middle (3-5 years)
Location Ternopil, Ukraine
Haskell 3yr.
Scala 2yr.
Plutus 2yr.
Akka
Cardano
Objective-C
OCaml
Python
Ruby
Swift
NumPy
Akka Actors
Akka Streams
Clojure
Scala Cats
Scala SBT
Matplotlib
Pandas
SciPy
Seaborn
Ruby on Rails
RVM
AWS ElasticSearch
PostgreSQL
Apache Mesos
Apache Subversion
Gitflow
Bash
Regexp
BugZilla
Docker
GraphQL
RESTful API
Jenkins
Jira
Kafka
ZeroMQ
Waterfall
Akka HTTP
Akka Stream
Coq
Emacs Lisp
Marathon
monocle
Plutarch
Plutus Core
portage
pyenv
Skikit-learn
Skipy
...

- 3 years of experience in Plutus / Cardano smart contracts developer role (Plutus Core, Plutarch) - Cardano ecosystem knowledge - Haskell, Scala, Cabal/Stack, GADTs/Type families, Generics, Servant, lenses, mtl, free monads - senior-level professional - Functional programming with FRP, Redux, Event sourcing, Category theory - OOP, OOD, UML, Design patterns, SOLID, DI. TDD, BDD, Unit, functional, and integration testing - 14 years of experience in software engineering

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Seniority Senior (5-10 years)
Location Ukraine
Node.js 5yr.
React 3yr.
Solidity
NFT
Python 10yr.
C++
JavaScript
R
TypeScript
Express
Next.js
HTML
XML
BigChainDB
Cosmos DB
CouchDB
MongoDB
MySQL
PostgreSQL
SQL
Asterisk
Avalanche
BEP-20
BSC
DeFi
ERC-1155
ERC-20
ERC-721
ETH (Ethereum blockchain)
ICO
IPFS (InterPlanetary File System)
TronChain
Wallets (Integration & Transaction Signing)
Bash
Perl
Docker
Kubernetes
GitLab CI
Odoo
Stripe
Payload Verification
Strap
...

• 15+ years of commercial software development experience • Solid knowledge of Solidity, C++, JavaScript, TypeScript; • Deep understanding of blockchain architecture and smart contract logic; • Cosmos, Tron, Avalanche, Binance Smart Chain, Ethereum dApps; • Strong skills in developing NFT smart contracts. Support and payload verification; • NFT Marketplaces (ERC - 721/1155), Crypto Payment Solutions & DeFi Cross Chain Bridges - ERC-20 Tokens, ICO, DEX, Staking, Swapping; • Highly qualified knowledge of Stripe payment system integration to blockchain data; • 10+ years experience working with Python; • 5 years experience working with Node.js; • Strong abilities with Express; • Experience working with Docker, and Kubernetes (K8s); • 3+ years of development experience with React.js. • No scheduled vacations within the next 3 months;

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Seniority Senior (5-10 years)
Location Ukraine
JavaScript 8yr.
React 8yr.
TypeScript 5yr.
Node.js 5yr.
Next.js 3yr.
Redux 4yr.
PHP 1yr.
React Native 1yr.
Angular
AngularJS
Backbone.js
Express
jQuery
NestJS
Angular CLI
Koa.js
ngFor
ngIf
NgRx
ngrx-forms
ngSwitch
React Bootstrap
reactive-forms
Redux-Saga
RxJs
Webpack
Angular Material UI
Ant Design
Material UI
Cordova
Ionic
AWS ElasticSearch
FireStore
MongoDB
MySQL
NoSQL
PostgreSQL
Redis
Sequelize
SQL
AWS
AWS EC2
AWS Lambda
AWS S3
Blockchain
Apache HTTP Server
Nginx
API
GraphQL
RESTful API
Conflict Management
Emotional Intelligence (EI)
Mentor Aptitude
Team Management
Team Management Skills
DeFi
Fortmatic
MetaMask
NFT
Smart Contract
Subsquid
Wallet Link
Web3
Docker
Kubernetes
MVC
REST
WebRTC
WebSockets
WordPress
...

10+ years of experience in web development, M.Sc in Software Engineering Front-End: Angular, React, Vue.js (JavaScript & TypeScript) Back-End: Node.js, Next.js, TypeScript , PHP Mobile: React Native AWS Cloud infrastructure Control systems (e.g., Git) and familiarity with DevOps practices for continuous integration and deployment (CI/CD). Unit testing, integration testing, and end-to-end testing. Experience leading and mentoring a team of developers, including assigning tasks, providing guidance, and ensuring the team's success. Ability to motivate and inspire team members, resolve conflicts, and provide constructive feedback. Experience conducting assessments and interviews remotely.

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Seniority Architect/Team-lead
Location Ukraine
Python
Django
Flask
Anthropic
PandasAI
TensorFlow
C#
JavaScript
APScheduler
AsyncIO
Beautiful Soup
Django Channels
Django ORM
Dramatiq
Pandas
pytest
CSS
HTML
Django REST framework
FastAPI
Vue.js
Vue Router
Vuex
Data Analysis
Data Mining
Elastic Search Platform
AWS ElasticSearch
MongoDB
PostgreSQL
Redis
SQLAlchemy
AWS MWS (Amazon Marketplace Web Service)
AWS S3
SP-API (Amazon Selling Partner API)
Google API
Telegram API
Bash
Celery
RabbitMQ
CI/CD
Cypress
Unit Testing
Docker
Jinja
microservices architecture
Nginx
Marshmallow
Natural Language
quip-API
...

- 5 years of experience in the IT industry as a Python Engineer - Proficient in using technologies such as Django DRF, Flask, Pandas, BeautifulSoup, SQLAlchemy, Asyncio, Flask + Marshmallow, Apscheduler, Jinja, Quip API, Docker, Nginx, Amazon MWS API, Amazon SP-API, Google API, and Telegram API; - Strong in refactoring, bug-fixing, and working with Python, JavaScript, Django, Django Rest Framework; - Skilled in developing faceted search and matching algorithms using ElasticSearch; - Experienced in PDF generation and importing from various formats; - Developed web applications, API interfaces, and automated scripts for data transformation; - Previous experience includes working as a Python developer focused on data scraping for Amazon, eBay, and Walmart products in dropshipping projects; - Also worked as a C# developer on various projects, specializing in web development, scraping, and parsing data; - Upper-Intermediate English; - Available ASAP

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Seniority Senior (5-10 years)
Location United States
JavaScript 5yr.
Web3.js
React
WebRTC
Ant Design 5yr.
Java
TypeScript
OpenAI
Ajax
Bootstrap
Bootstrap 4
CSS
CSS3
HTML
Material UI
SCSS
Socket.io
Storybook
Styled components
Tailwind CSS
Ethers.js
i18next
Mobx
React Hooks
React Query
Redux
Redux Thunk
Redux-toolkit
Zustand
Express
Ext JS
GatsbyJS
NestJS
Next.js
Node.js
MongoDB
PostgreSQL
Blockchain
seo
Agile
Clean Architecture
Kanban
Scrum
Cypress
Jasmine
Jest
Mocha
React-testing-library
Unit Testing
dApps
Hardhat
Solana
Docker
Problem Solving
WebSockets
Chakra UI
React-hook-form
WAGMI
...

- 5+ years of experience as a Front-end JavaScript Developer; - 5+ years of experience in React.js; - Proficient in Solana Blockchain operations, including managing deposits, executing transfers, creating Phantom wallets, and handling contract call interactions; - Strong abilities working with Web3; - Deep experience in Next.js technology; - Experience with WebRTC, Soket.io; - Good knowledge of Tailwind CSS, Bootstrap, and Chakra UI; - Experience working with Redux, and Docker; - Familiar with Node.js; - Proficiency in testing frameworks like Jest and Cypress; - E-commerce, web, and mobile applications, including learning platforms, chatbots, dApps, and cryptocurrency wallet extensions.

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Seniority Senior (5-10 years)
Location Castel San Giovanni, Italy
React 6yr.
Node.js 6yr.
Solidity 5yr.
Next.js 4yr.
Web3 5yr.
Python
Django
DeFi
Smart Contract
...

Innovative Full Stack Web Developer with 6+ years of experience building responsive web applications and 3+ years delivering decentralized applications (dApps) across EVM and non-EVM chains. Proven ability to integrate smart contracts, optimize wallet connectivity (ConnectKit, wagmi, Viem), and deploy scalable backends on AWS. Strong foundation in JavaScript/TypeScript, React, Node.js and DeFi protocols like Uniswap, Aave, and Curve. Experienced in secure, performant infrastructure design across both centralized (AWS) and decentralized (IPFS, Fleek) environments.

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Seniority Senior (5-10 years)
Location Vietnam
Python 8yr.
Django 7yr.
Django REST framework 7yr.
SQL
Jinja2 7yr.
Django Ninja 2yr.
Go
JavaScript
Solidity
TypeScript
LLM
OpenCV
CSS3
HTML5
SASS
Django ORM
Echo
Fiber
Gin
AWS ElasticSearch
PostgreSQL
AWS
DigitalOcean
GCP
Azure App Service
Django unit-tests
Unit Testing
Docker
GRPC
JWT
IPFS (InterPlanetary File System)
Jenkins
Jenkins CI
Kafka
RabbitMQ
Linux
Nginx
sendgrid
InterPlanetary File System
IT security audits
Python Django
...

Backend Software Engineer with over 8 years of experience, specializing in Python, Go, and cloud-native technologies. Expert in API development, system architecture, and integrating distributed systems within research, regulated, and blockchain fields. Proficient in Python, Go, SQL, Docker, Kubernetes, AI/ML tools, and cloud services (GCP, AWS). Has led backend development for decentralized applications, real-time monitoring, file-sharing systems, and automated SDLC focusing on security and performance. Demonstrates proficiency in DevSecOps, regulatory compliance, and modern backend frameworks.

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Seniority Senior (5-10 years)
Location South Africa
FPGA
VHDL
C/C++/C#
Python
Embedded Systems
Ant Design
HTML/CSS Preprocessors
CodeIgniter 3+
MS SQL Server Management Studio
DigitalOcean
Fastly
DSP
3D Modelling
AES
Encryption
Altium
Labview
MathCAD
MatLab
Vivado
ASIC
MCU
STM32
Clean Architecture
Cryptography
USB
CAD
CKDF
CMOS Sensors
Convolutional Filtering
Digital Beam Forming
Docker Machine
ECDSA
ECHD
FFT
MAC Algorithm
PCB Design
Phased Scanning
Quartus
RIPEMD
RSA
SHA256
SHA-3
SHA3
SoC FPGA
USB 3.0
XILINX
...

- Seasoned FPGA and embedded systems engineer with 10+ years of experience, and a track record of architecting and implementing complex hardware and software solutions; - Expert knowledge in VHDL, FPGA, CPLD, MCU, and SoC development, with proficiency in tools like Intel(Altera), Xilinx, and Modelsim; - Strong expertise in cryptographic acceleration, RADAR systems, digital signal processing, and PCB design; - Experience in leading a development team for a cryptography acceleration project and implementing advanced algorithms in various domains; - Robust background in electronic device development and embedded programming in C and Python.

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Seniority Expert (10+ years)
Location Kyiv, Ukraine
JavaScript
TypeScript
Python
SQL
C/C++/C#
Temporal
OpenAI
leveldb
MySQL
PostgreSQL
Redis
API
Docker
Ffmpeg
Git
IPFS (InterPlanetary File System)
Linux
Postman
Prometheus
WebSockets
InterPlanetary File System
Vast
Wasabi
...

The engineer is a proficient Full-Stack Developer and R&D Engineer with a core focus on cutting-edge technologies encompassing JavaScript, TypeScript, Python, SQL, and C++. They have demonstrated expertise in frameworks and technologies like NestJS, Node.js, React.js, Next.js, Blockchain, and Cosmos SDK, coupled with strong database skills in PostgreSQL, MySQL, Redis, and LevelDB. With extensive hands-on experience in DevOps & tooling such as Docker, Git, Linux, Prometheus, and Grafana, the engineer has successfully designed and developed high-availability full-stack applications. Their professional experience includes leading feature development to shorten time-to-market and significantly improving system performance and stability through strategic optimizations. The engineer's deep understanding of RESTful APIs, microservices architecture, and workflow orchestration underscores a commitment to technical excellence in software development practices. Notable achievements include architecting critical blockchain integrations and real-time data streaming functionalities for varied user-intensive platforms. Holding a B.Tech in Computer Science from Medicaps University with a notable academic record further anchors their theoretical understanding and practical application of software engineering principles, securing the foundation for continued professional growth and contribution to technology innovation.

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Seniority Junior (1-2 years)
MS SQL Server Management Studio
Unreal Engine
Linea
Azure VM
PHP
Express
Node.js
React
Java SE
Business Intelligence (BI) Tools
MongoDB
MySQL
Agile
Clean Architecture
FDD
MERN stack (MongoDB, Express, React, Node)
Tools
...

Seasoned Head of Engineering with 8+ years of experience in driving technical strategy and leading multidisciplinary development teams. Expertise in AI, blockchain, and full-stack custom software solutions including MERN stack, PHP, and MySQL. Proven track record at Macromodule Technologies, shaping engineering culture with agile principles and maintaining focus on delivering business-aligned, future-ready software products. Holds a Bachelor of Science in Computer Science and has previously elevated backend systems at Dtech Systems and spearheaded full-stack projects at ArhamSoft. Known for integrating emerging technologies and establishing engineering KPIs that foster continuous improvement and technical excellence.

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Seniority Expert (10+ years)
Project Management 5yr.
MS SQL Server Management Studio 5yr.
Unreal Engine 4yr.
DigitalOcean 4yr.
Core Graphics
CSP
...

- Accomplished Software Engineer with over 4 years of experience in developing robust code for high-volume businesses. - In-depth expertise in project management and a proven track record of applying skills in the efficient completion of several large-scale projects. - Highly skilled in SEO integration, digital marketing, and community management, particularly within the crypto and blockchain domains. - Holds multiple certifications in Moderating and Community Management, Project Management, Digital Marketing, and web3 management. - Technical prowess in project management platforms, community moderation tools such as Discord and Telegram, and leveraging social media analytics to enhance follower retention and engagement. - Recognized for successfully leading the Web3 community management, with achievements including a 20% improvement in follower retention through the introduction of new analytic protocols.

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Seniority Middle (3-5 years)
Location Manchester, United Kingdom
React
Vue.js
Angular
Next.js
Nuxt
JavaScript
Express
GatsbyJS
ASP.NET
Django
Fabric
Laravel
NgRx
Redux
Vuex
Firebase
AWS
...

Organized, collaborative and highly skilled full stack & blockchain developer with 8+ years of professional experience in dynamic and deadline-driven work environments. Self-motivated and self-taught professional who always trends to challenge difficult problems no one dares to try. The following skills can cover your project? - Blockchain (Solidity, Web3.js, Ethers.js) - JS frontend frameworks (React, Vue, Angular, Next, Nuxt, Gatsby) - Backend skills (Laravel, Express, Django, .NET) - Other (GraphQL, Shopify, AWS, Firebase, Google APIs, Typescript) If so, your project is already 99.99% done. The only thing left is to hire me and wait for the perfect result drinking coffee ~_~

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Seniority Senior (5-10 years)
Location Toronto, Canada
Solidity
PHP 13yr.
Node.js 3yr.
C
C#
C++
Java
JavaScript
Kotlin
Android APIs
CSS
HTML
jQuery
EJS
Mocha.js
Express
NestJS
Vue.js
Jhipster
Spring
Smarty
Yii
MySQL
AWS
Android
API
Apache Maven
DeFi
ETH (Ethereum blockchain)
EVM
Geth
Hardhat
NFT
Truffle
Web3
Git
MVC
WebSockets
Unreal Engine
...

- Software engineer with 10+ years of experience, specializing in Web and Blockchain technologies; - Expertise in Solidity for designing and deploying smart contracts; - Experienced in using Hardhat and Truffle for smart contract development and testing; - Deep abilities in Ethereum ecosystems and Solidity-based architectures; - Skilled in Ether.js and Web3.js for building dApps; - Proficient in designing complex systems, including yield farming and DeFi protocols; - Strong background in full-stack development; - Skilled in Node.js, Express.js, PHP, Java, and Kotlin for backend development; - Experienced in front-end development with Vue.js and EJS JavaScript frameworks; - Proven experience leading projects from concept to deployment across the entire SDLC; - Skilled in mentoring remote teams and collaborating effectively across functions; - Experienced in solution architecture, designing scalable systems, and ensuring smooth integration across platforms.

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Seniority Senior (5-10 years)
Location Bulgaria
JavaScript 5yr.
Swift 5yr.
FDD 5yr.
Node.js
React
Objective-C
ASP.NET MVC Pattern
.NET
Backbone.js
Meteor
Ethers.js
p5.js
Web3.js
FireStore
MongoDB
GCP
Agile
Algolia
CI/CD
Docker
Hardhat
Fastlane
Github Actions
Ubuntu
WebRTC
...

Software engineer with 9+ years of experience, excelling in full stack development with expertise in JavaScript, Swift, and iOS development. Proven track record of leading successful projects, including winning multiple hackathons and developing robust blockchain-based solutions. Demonstrates strong technical leadership, having managed diverse engineering teams and fostering agile best practices. Well-versed in various technologies like Node.js, React.js, Firebase services, Ethers.js, Web3.js, and AWS, with a solid foundation in computer science from Universidad Nacional del Nordeste. The engineer's proficiency in building scalable systems for music streaming, live video monitoring, and blockchain integration positions them as a valuable asset to any team seeking deep technical expertise and innovative solutions.

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Seniority Senior (5-10 years)
Blockchain 7yr.
Smart Contract 7yr.
Solidity 6yr.
Dapp 6yr.
DeFi 6yr.
...

Blockchain Developer | Web3 Engineer | Smart Contract Specialist Experienced Blockchain Developer with a deep understanding of decentralized applications (dApps), smart contracts, and blockchain architecture. Skilled in Ethereum, Solana, and Binance Smart Chain (BSC), with expertise in Solidity, Rust, and Web3 integrations. Passionate about building scalable, secure, and efficient blockchain solutions that drive innovation in DeFi, NFTs, and enterprise blockchain applications.Key Skills & Expertise: ✅ Blockchain Development: Smart contracts, tokenomics, DeFi protocols, NFT marketplaces ✅ Smart Contract Programming: Solidity, Rust, Move, Cairo ✅ Fullstack Web3 Development: Node.js, React, Next.js, Nest.js, Web3.js, Ethers.js ✅ Blockchain Frameworks: Ethereum, Solana, BSC, Polygon, Hyperledger ✅ Security & Auditing: Smart contract security, cryptography, vulnerability mitigation ✅ Infrastructure & DevOps: IPFS, The Graph, Oracles, Infura, Alchemy, Hardhat, Truffle ✅ Consensus & Protocols: Proof of Work (PoW), Proof of Stake (PoS), Layer 2 scaling

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Seniority Senior (5-10 years)
Location United States
React Native
React
JavaScript
TypeScript
AngularJS
Express
jQuery
Next.js
Node.js
Canvas
Redux
Redux-Saga
SCSS
Socket.io
Microsoft SQL Server
MongoDB
MySQL
Neo4j
PostgreSQL
AWS
AWS Amplify
AWS S3
Agile
ETH (Ethereum blockchain)
Web3
Git
GraphQL
PWA
...

- React/React Native Engineer with almost 6 years of professional experience - Experience with Amazon/Amplify/S3/Code push - Successfully developed both iOS and Android applications using React Native - Developing React/React Native apps that interface with Restful APIs - Experience with React/Redux/Third-Party API Integrations - Experience with GraphQL/Apollo - Upper Intermediate English - Available ASAP

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Seniority Senior (5-10 years)
Location Armenia
PHP 9yr.
JavaScript 9yr.
MySQL 9yr.
Solidity
Git 9yr.
SOLID 2yr.
C/C++/C# 1yr.
Laravel 1yr.
C++
Python
CodeIgniter
CodeIgniter 3+
CSS
HTML
Ethers.js
Web3.js
Node.js
Remix
MongoDB
BitBucket
Bitcoin Blockchain
BSC
ETH (Ethereum blockchain)
Hardhat
MetaMask
Phantom
Tron
Truffle
WalletConnect
Docker
LAMP
OpenCart
WordPress
Telegram API
LEMP
MERN stack (MongoDB, Express, React, Node)
Metamask SDK
Opencart 3
...

- 10+ years experience as a Full-Stack Developer with of developing robust web applications and services, including extensive experience in both frontend and backend technologies; - Technical proficiency with PHP and MySQL for server-side development, advanced JavaScript utilization on the client side; - Strong abilities with blockchain technology engagement, including smart contracts and wallet development using Solidity, Hardhat, Truffle, WalletConnect, and Metamask SDK; - Experienced with libraries Web3.js, and Ethers.js; - Ability to work Ethereum Blockchain, Binance Smart Chain (BSC), with different wallets including MetaMask; - Adept at working with a variety of frameworks and languages beyond core competencies, such as Laravel, Solidity, Node.js, and C++; - Up-to-date with modern practices, possessing comprehensive experience in codebase upgrades, performance optimization, and integrating third-party APIs; - Successfully led a development team, demonstrating strong leadership and project estimation skills.

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Seniority Senior (5-10 years)
Location Ukraine
Python 7yr.
Solidity 6yr.
Solana 4yr.
JavaScript 3yr.
Rust 2yr.
Cargo 4yr.
PostgreSQL 4yr.
AWS 4yr.
Anchor 4yr.
Celery 4yr.
Docker 4yr.
Docker Compose 4yr.
Audit
Rust 4yr.
Fuzz 4yr.
Pyth 4yr.
RustSecCargo 4yr.
SPL 4yr.
pytest 3yr.
Django 3yr.
Redis 3yr.
Django REST framework 2yr.
BSC 2yr.
Jenkins 2yr.
Alembic 1yr.
Pydantic 1yr.
FastAPI 1yr.
AWS ElasticSearch 1yr.
MongoDB 1yr.
SQLAlchemy 1yr.
AWS SQS 1yr.
Polygon 1yr.
Kafka 1yr.
Kubernetes 1yr.
Terraform 1yr.
TypeScript
Web3.py
Ethers.js
Web3.js
AWS Cloudformation
AWS CloudWatch
AWS Cognito
AWS EC2
AWS ECR
AWS ECS (Amazon Elastic Container Service)
AWS Elastic Kubernetes Service (EKS)
AWS IAM
AWS Lambda
AWS SNS
Aave
DAO
ERC-1155
ERC-20
ERC-721
Hardhat
IPFS (InterPlanetary File System)
MetaMask
OpenZeppelin
Uniswap
Api Gateway
Git
GitHub
Github Actions
GitLab
GitLab CI
Nginx
Base
DeFi Metachain
EIP-712
ERC-721A
EVM networks
Mythril
PancakeSwap
ProxyContracts
RDS
RustSec
Cargo
Slither
Solhint
Subgraphs
v2/v3
Wallets
Wormhole
...

- Team Lead / Tech Lead / Software Engineer / Blockchain Developer with 10 years of experience. - Strong expertise in blockchain development, building decentralized applications (dApps) using Solidity and Rust for EVM and Solana networks. - Proficient in frameworks like HardHat and Anchor. - Develop, test, and deploy smart contracts, integrating wallets (e.g., Metamask) and working with DeFi protocols (Uniswap, Aave) and NFT standards (ERC-20, ERC-721). - Has solid experience in backend development using Django, FastAPI, and SQLAlchemy for scalable APIs and microservices. - Familiar with CI/CD automation (e.g., GitLab CI/CD, GitHub Actions) and cloud infrastructure on AWS (Lambda, EKS, RDS). - Skilled in integrating blockchain technologies with backend systems, ensuring code quality through unit testing, fuzz testing, and security audits with tools like RustSec and Slither.

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Seniority Architect/Team-lead
Location Poland
Go 3yr.
Python 1yr.
TypeScript 1yr.
AWS 4yr.
PostgreSQL 3yr.
...

Software Developer | Backend & Web3 Engineer | Golang, TypeScript, PythonResults-driven software developer with 3+ years of experience in building scalable backend systems, financial infrastructure, and Web3 solutions. Proficient in Golang, Python, TypeScript, C++, and cloud-native technologies (AWS, Kubernetes, Docker).🔹 Currently at Syndr, designing high-performance exchange servers, optimizing data pipelines, and developing Web3 SDKs. 🔹 Previously at Epifi, led UPI-based financial workflows and transaction processing using Temporal. 🔹 Ex-Smarsh, where I improved database architecture and query performance for SaaS compliance solutions.Passionate about distributed systems, blockchain, and high-performance computing. Active contributor to open-source and tech communities.📌 GitHub: AbhinitKumarRai | LinkedIn: Abhinit Rai

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Seniority Middle (3-5 years)
Project Management 5yr.
MS SQL Server Management Studio 5yr.
Unreal Engine 4yr.
DigitalOcean 4yr.
Celonis
Google Analytics
Google Spreadsheets
Azure log analytics
seo
Core Graphics
CSP
Telegram API
Discord Management
...

Software Engineer with 4 years of experience specializing in high-volume business code development and project management. Expertise in SEO integration, digital marketing, and Web3 community management with a strong background in using project management platforms and community moderation tools. Holds certifications in Community Management, Project Management, Digital Marketing, and Web3 management. Recognized for leading Web3 community initiatives, improving follower retention by 20% with analytical protocol enhancements. Technical skills include Project Management (5 years), Unreal Engine, DigitalOcean, and MS SQL Server Management Studio (each 4 years), along with proficiency in iOS Core Graphics and CSP.

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Seniority Middle (3-5 years)
Location Manchester, United Kingdom
Go 14yr.
React
JavaScript
PostgreSQL
C++
Java
Kotlin
Python
Ruby
Scala
Swift
TypeScript
X++
Apache Spark
ASP.NET MVC Pattern
ASP.NET WebForms
Entity Framework
.Net WCF
ATL
libxml++
OmniOrb
ulxmlrpcpp
Boost
MFC
CSS
HTML
jQuery
XML
Echo
Gin
Gorilla Mux
GORM
Expo.io
Vue.js
p5.js
React Hooks
React Native
Robot Framework
AWS ElasticSearch
CockroachDB
FoundationDB
Microsoft SQL Server
MongoDB
Oracle Database
Redis
Google BigQuery
Google Cloud Services
Google Data Studio
Consul
cURL
GRPC
WebSockets
Cucumber
Selenium
Docker
Kubernetes
IBM WebSphere Application Server
loki
microservices
REST
NATS
RabbitMQ
REST C++ SDK
Winforms
STL
Quantiles on Streams
Redemption
SVG
...

- Certified Senior Go Engineer ( 12 years with Go, 19 years in Software Engineering) with experience in software engineer, team lead and software architect roles. - Master’s Degree in Computer Science - Designed and implemented a scalable multi-microservice backend for an enterprise AdTech CRM, integrating 10+ third-party services and streamlining client management operations. - Built and deployed a billing system for a money exchange platform, integrating third-party payment systems and delivering a user-friendly web interface for seamless transactions. - Optimized data processing pipelines by implementing quantiles on streams, enabling real-time analytics and supporting large-scale data operations for scientists and business stakeholders. - Extensive background in data processing and reporting.

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Seniority Expert (10+ years)
Location Kharkiv, Ukraine
Node.js 8yr.
Web3.js 4yr.
Solana 2yr.
EthereumJS 2yr.
React
JavaScript 8yr.
TypeScript 8yr.
NestJS 7yr.
Github Actions 5yr.
RabbitMQ 3yr.
OpenAI
CSS
HTML
SCSS
Styled components
i18next
Mongoose
mui
Pm2
Redux-Saga
Redux Thunk
Redux-toolkit
AWS ElasticSearch
Sequelize
Typeorm
AWS AppSync
AWS CloudWatch
AWS Cognito
AWS EC2
AWS ECR
AWS Elastic Kubernetes Service (EKS)
AWS IAM
AWS Route 53
AWS S3
AWS SDK
AWS VPC
GCE
GCP BigQuery
Artifacts
GitLab CI
Jenkins
BitBucket
Git
Chai
Phantom
Cron
Docker Compose
Kubernetes
Terraform
Figma
Jest
Mocha
Nginx
Prometheus
RESTful API
Swagger
WebSockets
GKE XMPP
IAM\RBAC
RDS
...

- Full-Stack Engineer with over 8 years of experience specializing in Web2 and Web3 technologies, blockchain development, and Full-Stack architecture. - Has 4 years of experience working with web3, implementing blockchain solutions using Ethereum, Solana, and smart contracts. - Proven expertise in tokenization, NFT integration, and cryptocurrency transactions for real estate, voluntary donation, and other industries. - Expertise in Node JS, Nest JS, and RESTful APIs, with proficiency in React JS for frontend development. - Strong experience with databases like PostgreSQL, Redis, MongoDB, and DynamoDB. - Well-versed in cloud services, including AWS and GCP, and experienced in container orchestration with Kubernetes. - Proficient in CI/CD using Jenkins, GitHub Actions, Bitbucket Pipelines, and Terraform. - Familiar with Nginx for web server management and ensuring smooth application deployments.

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Seniority Senior (5-10 years)
Location Warsaw, Poland
Rust 2yr.
Solidity
C++
Go
JavaScript
PHP
TypeScript
Angular
NestJS
Node.js
React
Vue.js
Ethers.js
Web3.js
Laravel
MongoDB
MySQL
SQL
Anchor
Binance
BSC
DAO
Dapp
DeFi
DEX
ERC-1155
ERC-20
ERC-721
ETH (Ethereum blockchain)
EVM
Hardhat
HTX ECO Chain (Heco)
Hyperledger
MetaMask
NFT
NFT marketplace
Phantom
Polkadot
Polygon
Smart Contract
Solana
Tezos
Torus
Tron
Truffle
Web3
Principle
RESTful API
SSV network
...

- Engineer who has 6+ years of experience with many programming languages, frameworks, and platforms; - 2+ years experience with developing smart contracts on Rust; - Solid skills with Solidity; - Working experience in building an NFT marketplace platform on Polygon and Binance Smart Chain using ERC-721 and ERC-1155; - Experience with ether.js, web3.js, and JS/TS frameworks; - Familiar with blockchain Ethereum, Binance, Tron, Solana, Polkadot, Tezos, Polygon, Huobi ECO chain, etc; - Deep knowledge in implemented Metamask, Torus, and other wallets to increase user experiences with the web apps; - Advanced English; - Available ASAP.

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Seniority Senior (5-10 years)
Location Singapore
Web3
Node.js
NestJS
PostgreSQL
AWS
C++
Java
PHP
Solidity
AdonisJS
Angular
jQuery
React
Vue.js
Kohana
Laravel
Lumen
Yii
Spring
Cassandra
Memcached
Microsoft SQL Server
MySQL
Redis
Azure
GCP
AWS SQS
Apache Solr
Cross-chain Swaps
elliptic cryptography
ETH (Ethereum blockchain)
Hyperledger
ICO
NFT
Kafka
RabbitMQ
microservices architecture
Netcat cms
...

- Full Stack Developer with strong blockchain skills. - Over 10 years of experience in IT. - More than 7 years of experience with Node.js and Nest.js. - Strong skills with Express.js. - Over 7 years of experience with PostgreSQL. - In-depth knowledge of Docker and Kubernetes. - Experience with Angular. - Experienced in blockchain projects since 2017. - In-depth knowledge of blockchain integration into the backend. - Upper-intermediate English. - Available ASAP.

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Seniority Senior (5-10 years)
Location Ukraine
NFT 5yr.
Smart Contract
FDD
CI/CD
SOLID
PostgreSQL
Azure Blockchain
Alchemy
BSC
Coinbase wallet
DeFi
DEX
EIP
ERC-20
ERC-721
ERC-777
Infura
IPFS (InterPlanetary File System)
MetaMask
Polygon
Tron
WalletConnect
API
CD DevOps pipelines
Jenkins
Docker
Git
Microsoft Visual Studio Code
Sublime Text
Mocha
Unit Testing
ChaiJs
POS
Stylelint Jira
...

Accomplished Blockchain Developer with over 5 years of expertise in designing and implementing advanced applications with a focus on blockchain technology, smart contract and dApp development. Strengths include hands-on experience with PoS/PoA sidechains, Ethereum, Binance, Tron, and a plethora of ERC standards, backed by robust skills in Golang, JavaScript, Solidity, and cloud technologies. Proficient in fostering innovative database design, API development, and server management, which are further enhanced by a seasoned track record in deploying blockchain solutions on AWS and GCP. Distinguished by participation in high-profile projects like decentralized exchanges and NFT platforms, showcasing not only technical prowess but also effective collaboration with cross-functional global teams and deployment of CI/CD pipelines.

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Seniority Senior (5-10 years)
Location Indore G.P.O., India
PHP
NestJS
microservices architecture
TypeScript
React
AI
JavaScript
Angular
Ext JS
Svelte
Vue.js
Ant Design
Chrome Extensions
HTML/CSS Preprocessors
Laravel
Redux-Saga
MongoDB
PostgreSQL
SQL
AWS
seo
Agile
CI/CD
Docker
Kubernetes
Figma
Prototyping
Git
GraphQL
Jest
Postman
Project Management
OMG UML
Vue draggable
...

Senior Full Stack Developer with a Master’s in Computer Science and a depth of experience in front/backend technologies across multiple domains. Practical knowledge of Python, Django, Next.js, NestJS, and a robust foundation in PostgreSQL. Proven capability in leading development projects, optimizing database schemas, and leveraging CI/CD pipelines with Docker and Kubernetes. Skilled in Agile methodologies, project management, and UI/UX design paired with a substantial background in IoT solutions, showcasing versatility and technical prowess. Recognized for streamlining operations, reducing costs through automation, and advancing retail technology platforms.

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Seniority Senior (5-10 years)
Location Frankfurt, Germany
Go 2yr.
JavaScript
Rust
Node.js
NestJS
Dart
Kotlin
Python
Swift
TypeScript
Axum
Flutter
Tauri
CSS
HTML
SvelteKit
Django
Express
Next.js
React
Svelte
Gin
Jetpack Compose
Redux
CockroachDB
MongoDB
PostgreSQL
Redis
YDB
AWS
DigitalOcean
Heroku
Hetzner
AWS Cognito
AWS EC2
AWS IAM
AWS RDS (Amazon Relational Database Service)
AWS S3
AWS S3 MinIO
A/B Testing
Affinity
CJM
Figma
Procreate
User Flow
User Interviews
Docker
ETH (Ethereum blockchain)
NEAR
Substrate
GRPC
MVC
MVVM
MVP
SwiftUI
UIKit
Tower
...

- 6+ years experience as a Software Engineer; - 2 years experience working with Go; - Deep abilities working with Rust; - Good knowledge of creating smart contracts; - 4 years experience working with JavaScript, React, Next.js, Redux; - Experience working with TypeScript; - 3+ years of experience working with Node.js; - Good skills working with NestJS; - Experience working with Python, Swift, Kotlin, Flutter, Express; - Experience working with AWS; - Experience working with PostgreSQL, MongoDB; - Good skills on team lead - led ~12 people; - Took part in all aspects of product design and engineering, from marketing, and business investigation to the MVPs for start-ups, pitch decks, and mock-ups; - Upper-Intermediate English.

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Seniority Senior (5-10 years)
Location Estonia
AA RPA
Business Analysis
MS Power Automate
Visual Basic .NET
Robot Framework
PHP
VBScript
Jasperreports
Salesforce
XML
XPATH
Tableau
UIPath
SSRS
AWS
Azure
Azure Service Fabric
SAP
Ansible
Jenkins
Jira
Outlook
PowerShell
QA Automation
Blue Prism
LaTeX macros
...

Software engineer with 3+ years of experience in RPA and software development. Holds a Bachelor's in Mechanical Engineering and a Master's in Information Systems. Proficient in Power Automate, UiPath, Power Apps, and has extensive work with automation tools across E-Commerce, Healthcare, Finance, and Banking sectors. Technical expertise in scripting and programming languages such as VB.NET, ASP.NET, Java, JavaScript, Python, and SQL. Recognized for significant contributions to client project success and process efficiencies in professional tenure. Skilled in SDLC, RPA lifecycle, cloud services, and migrations from UIPath to Power Automate, indicating versatility and readiness for complex technical challenges.

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Seniority Middle (3-5 years)
Location India
Flutter 4yr.
GCP 4yr.
Firebase 4yr.
Go
TensorFlow
Laravel
Node.js
GCE
OpenAL
...

* Software engineer with over 4 years of experience in mobile app development, specializing in Flutter and proficient in Dart, Kotlin, and Go. * Strong technical expertise in building robust backend systems, REST APIs, and has a keen interest in Blockchain technology within the GCP ecosystem. * Demonstrated ability in web development using modern technologies including HTML, CSS, JavaScript, React, and NextJs. * Active contributor to open-source projects, enhancing the value of platforms like APIDash and GoCoin. * Holds a Bachelor's and a Master's degree in Computer Engineering, underpinning a solid understanding of software development practices. * Recognized for building impactful mobile applications such as Edutive for education and Racha for addiction management.

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Seniority Middle (3-5 years)
Location Bamenda, Cameroon
Rust 1yr.
C/C++/C# 1yr.
Solana
Axum
Tokio
Apache Velocity
KDB
AWS
Linux
WebAssembly
Backend
Clap
Fat-Free
Rayon
Serde
...

Software Engineer with expertise in backend development, blockchain technology, and big data, boasting a solid foundation in computer science from Ukrainian Catholic University. Holds a strong junior/middle experience level, with hands-on Rust, C++, and a gambit of modern technologies such as Solana, Axum, and Kafka. Proven track record of developing robust solutions for cryptocurrency swapping and NFT architecture, time-series data manipulation, and digital media copyright solutions. Notable achievements include contributions to open-source projects, and winning a national programming tournament. Fluent in advanced software engineering paradigms and well-versed in real-time streaming and machine learning library development.

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Seniority Junior (1-2 years)
Location Lviv, Ukraine
Go
Solidity
Java
JavaScript
PHP
Ruby
Rust
TypeScript
Angular
Next.js
Node.js
React
CSS
HTML5
XML
Django
Echo
Electron
Redux
JSON
Laravel
Ruby on Rails
Cosmos DB
Firebase
MongoDB
MySQL
PostgreSQL
SQLite
AWS
GCP
Atlassian Confluence
Atlassian Trello
Jira
Avalanche
BSC
ClubHouse
Dapp
dApps
DeFi
DEX
ERC-20
ERC-721
ETH (Ethereum blockchain)
Hardhat
LayerZero
NFT
Polygon
Smart Contract
Solana
Substrate
Truffle
Venly
Web3
BitBucket
Git
GitHub
GitLab
Docker
Flux
GraphQL
MVC
MVVM
MVP
...

- Fast-paced, high-quality, detail-oriented, and self-motivated developer with more than 10 years of experience in the IT industry. - I use the TDD approach for designing the architecture and implementing scalable and maintainable web apps/services. - I have been working on a bunch of projects and meanwhile, I worked in several positions across frontend developer, backend developer, full-stack developer, and lead engineer. - Bridge Smart Contract which is for transferring tokens across networks. - NFT Dapps such as madlab, Art Basel, Fateful Youth - eWallet App and GSM e-commerce product. - Smart contracts in complex Defi and DEX structure - Blockchain networks including Ethereum, BSC, Polygon, and Solana. - Deploy and work on various kinds of tokens - ERC20, ERC721, ERC721A, ERC1155. - Cross-chain smart contracts using LayerZero - NFT market smart contract for auction and offer with lazy minting - Proxy smart contract - NFT marketplace Dapp using Venly - Available: ASAP

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Seniority Senior (5-10 years)
Location Hong Kong
C
C++
Rust 3yr.
C#
Java
JavaScript
PHP
Solidity
TypeScript
Vyper
ASP
ASP.NET MVC Pattern
.NET Core
.NET Framework
CSS
HTML
Ethers.js
React Native
Java Server Pages (JSP)
Next.js
Node.js
React
Remix
Vue.js
MongoDB
MySQL
Oracle Database
ORM
PostgreSQL
Redis
SQL
Anchor
Brownie
DEX
EIP
ERC-20
Ganache CLI
Geth
Hardhat
Infura
NFT marketplace
Smock
Truffle
Web3
CI/CD
Git
SVN
WPF MVVM
...

- Senior Blockchain & Full Stack Engineer with over 15 years of experience in Web and Blockchain development. - Highly skilled Blockchain Professional with hands-on experience building Decentralized Applications and NFT Marketplaces. - Deep understanding of the architecture and protocols of Blockchain and Hyperledger including Bitcoin, Ethereum, L2 solutions, Cross-Chain. - Concentrating on ICO/IEO/IDO projects, helped many Startups and enterprising companies to raise funds and build Ecosystems on the Blockchain. - Quant Developer with a rock-solid understanding of Financial Markets, Quant Trading. - Strong at Solidity, Python, Rust, Web3.js, React, Typescript, Next.js, Node.js, Moralis. - A Veteran at C/C++/C#. - Great teamwork and troubleshooting skills. - Full-time remote, 40+ hours a week. - Upper intermediate English

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Seniority Senior (5-10 years)
Location Canada
Rust
C++
Go
TypeScript
React
Cosmos DB
Anchor
Cross-chain Swaps
DEX
Moralis
NEAR
NFT
NFT marketplace
Smart Contract
Solana
Web3
...

- 5+ years of experience in blockchain development - Advanced English - Available ASAP

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Seniority Senior (5-10 years)
Location Sydney, Australia
Rust
C++
Linux
NEAR
Solana
...

- 15 years experience with programming languages VB, C/C++; - First projects - embedded devices on AVR/STM32/ESP and applications for windows. - But since ~2017 I'm using an embedded experience very seldom and mostly developing software for Linux on C++. - Since 2022 I have switched the Rust and don't want to use C++ as the main language anymore. - Intermediate English.

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Seniority Senior (5-10 years)
Location Ukraine
Rust
Solidity
JavaScript
PHP
Python
TypeScript
CSS
HTML
SCSS
Styled components
Ethers.js
React-Saga
React Thunk
Redux
Web3.js
Webpack
Node.js
React
Vue.js
MongoDB
AWS
Anchor
BEP-20
BEP-721
Binance
DeFi
ERC-1155
ERC-20
ERC-721
ETH (Ethereum blockchain)
Fantom
IPFS (InterPlanetary File System)
MetaMask
NFT
NFT marketplace
OptyFi Protocol
Polygon
Quickswap
Smart Contract
Solana
Sushiswap
Terra
Uniswap
Xdai
Docker
GraphQL
...

-As a senior Programmer and Blockchain developer, with over 6 years of development, I am an expert in NFT Website, NFT Art Generation, and NFT Marketplace, Solidity, Web3, EVM based network chains, Custom smart contracts, ERC20/721, ERC1155, NFTs, IDO's, Bridges Block explorers, UI Web3 Dapps Integration, IPFS. - Smart Contract Development (Solidity/ Rust/ Anchor Framework/ Cosmwasm) - Cardano smart contract by utilizing CosmWasm smart contract by utilizing Rust CosmWasm. - Solanasmartcontractimprovement(Unittest,Solana-program-library,Solana-web3,Raydiumtradeandorca)by utilizing Rust and Anchor system. - Polkadot Relay Chain using Substrate in Rust programming. - Smart contract advancement in networks (Ethereum, BSC, Matic/Polygon) by utilizing Solidity. - Uniswap V2, V3, Curve (Yearn, Convex), Sushiswap, Quickswap, etc. - Written smart contracts for ERC20, ERC223, ERC721, ERC1155, ICOs, airdrop, Vesting, MultiSig, Wallet, etc - DeFi, Dex protocols - Front-end development with Smart contract integration by utilizing Web3, truffle. React (Redux/Thunk/Saga), Typescript, Node js. - NFT minting website andNFT marketplace development(Create a listing by admin, flat&Crypto payment,Bundle Sale/ Bulk Transfers, Drop)

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Seniority Middle (3-5 years)
Location Buenos Aires, Argentina
Node.js 5yr.
Go 3yr.
Solidity
Rust 3yr.
Avalanche 2yr.
Substrate 2yr.
Solana 1yr.
Java
JavaScript
PHP
Ruby
TypeScript
Angular
Next.js
React
CSS
HTML5
XML
Django
Echo
Electron
Redux
JSON
Laravel
Ruby on Rails
Cosmos DB
Firebase
MongoDB
MySQL
PostgreSQL
SQLite
AWS
GCP
Atlassian Confluence
Atlassian Trello
Jira
BSC
ClubHouse
Dapp
dApps
DeFi
DEX
ERC-20
ERC-721
ETH (Ethereum blockchain)
Hardhat
LayerZero
NFT
Polygon
Smart Contract
Truffle
Venly
Web3
BitBucket
Git
GitHub
GitLab
Docker
Flux
GraphQL
MVC
MVVM
MVP
...

- Fast-paced, high-quality, detail-oriented, and self-motivated developer with more than 10 years of experience in the IT industry; - I use the TDD approach for designing the architecture and implementing scalable and maintainable web apps/services. - I have been working on a bunch of projects and meanwhile, I worked in several positions across frontend developer, backend developer, full-stack developer, and lead engineer; - In-depth skills develop smart contracts on Solidity; - Good skills working with Go; - 3 years experience with Rust; - 2 years experience with Substrate; - Smart contracts in complex DeFi and DEX structure; - Bridge Smart Contract which is for transferring tokens across networks; - Proxy smart contract; - eWallet App and GSM e-commerce product; - Blockchain networks including Cosmos, Ethereum, BSC, Polygon, Avalanche and Solana; - 5+ years experience with Node.js; - Deep skills working with Apollo GraphQL; - Good abilities working with Hardhat framework; - Deploy and work on various kinds of tokens - ERC20, ERC721, ERC721A, ERC1155; - Cross-chain smart contracts using LayerZero; - NFT Dapps such as madlab, Art Basel, Fateful Youth; - NFT market smart contract for auction and offer with lazy minting; - NFT marketplace Dapp using Venly; - Available: ASAP.

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Seniority Senior (5-10 years)
Location China
Rust 3yr.
Solidity
Dart
Java
JavaScript
Python
Actix Web
CSS
HTML
XML
Django
Flutter
React
MariaDB
Microsoft SQL Server
PostgreSQL
sqlx
Heroku
Agile
microservices architecture
SOAP
GitLab
GraphQL
RESTful API
GRPC
Linux
QA Automation
Smart Contract
Web3
...

- 3 years of experience with Rust - Efficiently deployed web application powered by rust backend. - Built innovative microservices and Web Services using Web Actix and diesel. - Engineered and maintained modern web assembly application using Rust . - Developed web application using sqlx and Web Actix. - Strong front-end interaction skills with Solidity transactions. - Highly qualified knowledge of working with Metamask wallet, transactions, and fees for them. - Upper-Intermediate English. - Available ASAP.

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Seniority Middle (3-5 years)
Location Nigeria
Rust 2yr.
Solana
C# 5yr.
JavaScript
TypeScript
Angular
NestJS
Node.js
Angular Material UI
CSS
SCSS
ASP.NET
.NET
RxJs
Microsoft SQL Server
PostgreSQL
Sequelize
Anchor
Smart Contract
Bash
Docker
Git
Karma
Unit Testing
Web API
...

- 7+ years experience as a web developer; - 2 years of experience with developing smart contracts in Rust; - Deep skills working with Solana blockchain; - Good abilities working with Anchor; - 5+ years experience working with C#; - Good knowledge of JavaScript, and TypeScript; - 2+ years experience working with Angular framework; - Experience with Node.js, and NestJS; - Good abilities working with .NET; - Experience working with Docker; - Upper intermediate English.

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Seniority Senior (5-10 years)
Location Kyiv, Ukraine
Rust
Go
Java
JavaScript
Ruby
Ur/Web
AngularJS
Express
jQuery
React
Capistrano
Capybara
Watir
Gin-gonic
Gorilla Mux
Gulp.js
Redux
Webpack
Hanami
Roda
Ruby on Rails
Sinatra
Socket.io
Spring
Aura
AWS DynamoDB
AWS ElasticSearch
AWS Redshift
BerkeleyDB
Cassandra
Memcached
MongoDB
MySQL
Neo4j
NoSQL
PostgreSQL
Redis
SQL
SQLite
AWS
Azure
AWS EC2
AWS S3
Azure Blob Storage
Azure DB Cloud
Azure DevOps
Azure Flash App
Azure Key Vault
Azure Redis
Big Table
Ansible
CD DevOps pipelines
Jenkins
TeamCity
Atlassian Trello
Jira
Cucumber
Gatling
JMeter
RSpec
Centos
FreeBSD
Linux
Oracle Solaris
Ubuntu
Windows
Docker
Kubernetes
Terraform
Git
Gitflow
Perforce
LAMP
RabbitMQ
vim
...

- More than 17 years of commercial experience in IT; - Experience cooperating with clients worldwide and building products related to various spheres: e-commerce, real estate, custom CRM, trading, social media and many more. Product tech design and full cycle of development and support; - Deep experience in development web applications using Ruby on Rails, Rust, Java, JavaScript, Go; - Strong experience of AWS, Azure Clouds, Google Clouds; - Experience in team leading and CTO; - Upper-Intermediate English; - Available: ASAP.

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Seniority Senior (5-10 years)
Location Ukraine
Rust 2yr.
Solana 2yr.
JavaScript
Solidity
TypeScript
Express
Node.js
Tortoise ORM
Web3.js
MongoDB
PostgreSQL
Redis
AWS API Gateway
AWS CloudWatch
AWS Lambda
AWS S3
AWS SNS
AWS SQS
Anchor
ERC-20
ERC-721
ETH (Ethereum blockchain)
Ganache CLI
IPFS (InterPlanetary File System)
OpenZeppelin
Truffle
BitBucket
Git
GitHub
CLI
Docker
Docker Compose
Jest
ProxyContract
Slither
Solhint
SPL
Waffle
...

- Blockchain Developer with a 5-year background in financial technologies, specializing in Crypto, De-Fi, and NFT domains. - Exhibits proficiency in several programming languages, including Solidity, Rust, JavaScript, and TypeScript. - Key technical experience encompasses Ethereum, Solana, IPFS, and advanced blockchain development tools and practices. - Has experience in smart contract architecture design, blockchain integration, and secure transaction implementation across multiple projects, such as decentralized gaming platforms, NFT collections, and crypto exchanges. - Demonstrated capabilities in both backend technologies (Node.js, Express.js) and cloud infrastructures (AWS suite) - Upper-Intermediate English

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Seniority Senior (5-10 years)
Location Warsaw, Poland
Rust
Solana
Java
PHP
Python
Scala
Apache Spark
Spring
Django
AWS ElasticSearch
Cassandra
MongoDB
MySQL
PostgreSQL
Blockchain
Agile
Bash
Docker
Kubernetes
Git
GraphQL
GRPC
Kafka
RabbitMQ
NEAR
Casper Network
Filecoin
Fuel
Zero Knowledge
...

- 8 + years experience in IT; - 5+ years experience working with Rust; - Good skills in creating smart contracts for Solana and NEAR Blockchains; - Experience in building a bridge to Casper Network; - Experience working with Filecoin, Zero Knowledge modules, and Fuel Blockchain; - Deep abilities with MySQL, PostgreSQL, MongoDB; - Experience working with Python, Java, PHP, Scala, and Spring; - Good knowledge of AWS ElasticSearch; - Experience working with Docker and Kubernetes (K8s); - Experience working with DeFi and DEX projects; - Deep skills with Apache Cassandra and Apache Spark; - English: Upper-Intermediate.

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Seniority Senior (5-10 years)
Location Czech Republic
Rust 2yr.
Python 2yr.
Actix Web
Axum
Rocket
Django
FastAPI
Flask
Django ORM
AWS DynamoDB
MySQL
PostgreSQL
Redis
SQLAlchemy
AWS Cloudformation
AWS Lambda
API
RESTful API
CI/CD
CLI
Docker
Terraform
Grafana
Prometheus
RabbitMQ
GH Actions
Pony ORM
...

- 4 years of development experience, including 2 years of Rust development and 2 years of previous Python backend development experience. - Development and design of high-load fintech solutions using Rust and Python - Experience with Rust microservices (Actix Web, Rocket, AWS Lambda) - Upper-Intermediate English

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Seniority Middle (3-5 years)
Location Kyiv, Ukraine
Elixir 3yr.
Haskell
Plutus
Ruby
Ajax
CSS
HTML
jQuery
Phoenix
AngularJS
Ruby on Rails
PostgreSQL
SQL
Blockchain
API
GraphQL
Cardano
Stellar
CMS
DDD
Metaprogramming
MVC
OOP
Publish/Subscribe Architectural Pattern
SOLID
TDD
Git
Elixir Phoenix
LiveView
test coverage
...

- Started career as a Ruby on Rails developer and worked exclusively with it for around 4 years, after which switched to Elixir and have 3.5 years of commercial experience with it - Last version engaged with RoR: 5.2 - Proficient in Phoenix / Elixir, Ruby on Rails, and AngularJS, focusing on performance improvements, test coverage, and refactoring. - Foundational knowledge of Haskell and Plutus for writing smart contracts on the Cardano blockchain. - Upper-Intermediate English

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Seniority Middle (3-5 years)
Location Serbia
TypeScript 10yr.
JavaScript 10yr.
Node.js 10yr.
Java
PHP
Swift
Ant Design
Bootstrap
CSS
HTML
Material UI
SCSS
Socket.io
ES6
Mongoose
Redux
Express
NestJS
Next.js
React
Vue.js
AWS DynamoDB
MongoDB
MySQL
PostgreSQL
Redis
Sequelize
Typeorm
AWS
DigitalOcean
AWS CloudFront
AWS EC2
AWS Elastic Kubernetes Service (EKS)
AWS Lambda
AWS S3
AWS SQS
Azure Blockchain
ETH (Ethereum blockchain)
Web3
Command and Query Responsibility Segregation (CQRS)
microservices architecture
Docker
Kubernetes
Git
GitLab CI
GraphQL
RESTful API
GRPC
WebRTC
WebSockets
iOS
Linux
macOS
Windows
Jest
Jira
Redmine
Kafka
RabbitMQ
Nginx
...

- More than 10 years of experience in developing applications using JavaScript and TypeScript - Experience with a setup a blockchain IoT network using the Hyperledger(infrastructure) - Built a system and smart contracts, that are deploying into ETH network for digital signing of contracts for each deal of customers - Setup an ETH explorer - Build a web game, based on Solana, NFT tokens - Experience with a migration from a monolithic architecture to microservices, it helped to spread jobs between teams and increased development speed, also here grew and lead the most productive team in the company (11 people) - For the KYB/KYC platform startup based in Estonia architectured and implemented a whole app with Nest.js and React, it helps to build scale and flexible application, CQRS architecture - Built processes for project lifecycle from development to release, CI/CD, started and scaled team, held workshops for the team - Built a headless modern framework for frontend that based on React, swiftly increased a development speed - Solved problem with a slow project building, increased speed x7.7 (210s ->27s) - Supported a quite aging project and migrated some parts to microservices, wrapped into Kubernetes - Optimized database queries, increased x3 - Suggested a better structure for a codebase for GraphQL and React, increased development speed - Architecture & Tech Lead at Node.js Department

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Seniority Expert (10+ years)
Python
JavaScript
OpenAI
Aiogram
AsyncIO
Pandas
Pydantic
pytest
Django
FastAPI
jQuery
MongoDB
MySQL
PostgreSQL
Redis
SQL
SQL Alchemy
AWS
Atlassian Trello
Jira
Bash
Celery
CI/CD
Docker
Docker Compose
RESTful API
Stripe
Telegram API
Git
Kanban
Scrum
Linux
macOS
Windows
Selenium
Pipedrive
...

- Python Software Engineer with more than 4+ years of experience in software development - Proven ability to design and build telegram chatbots from scratch, implementing functionalities like search algorithms (CV parsing), voice recording, and payment processing integrations (Stripe, Liqpay). - Has experience integrating GPT with telegram bots - Expertise in database management (PostgreSQL, SQL Alchemy) and data security. - Implemented continuous integration and deployment practices (Jenkins, Docker) for streamlined deployments. - Excellent knowledge of common software engineering practices, like OOP principles, modern design patterns, test-driven development, continuous integration, and continuous deployment

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Seniority Middle (3-5 years)
Location Kharkiv, Ukraine
PHP
AlpineJS
Webpack
Bootstrap
CSS
HTML
Tailwind CSS
Laravel
October CMS
Symfony
Yii
PHPUnit
Vue.js
MySQL
Redis
Apache HTTP Server
Nginx
API
CMS
Git
Gitflow
iOS
Ubuntu
...

- PHP Backend-developer with 10+ years of experience. Most of my career I use Laravel as my main instrument. Worked in teams up to 10 members as backend-dev. - Also worked as freelancer - full-stack dev/manager: finding clients worldwide and communicating with them directly, creating teams of 2-3 people and managing their work - Upper-Intermediate English

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Seniority Senior (5-10 years)
Location Ukraine
Ruby on Rails 9yr.
Bootstrap
Capistrano
Capybara
omniauth
Sidekiq
Faker
i18next
React
Heroku
Postman
RSpec
Selenium Webdriver
Docker
Jenkins
Mailchimp API
QuickBooks
cancancan
Factory bot
Kaminari
nokogiri
paperclip
Polly
pundit
Recaptcha
spree
Unicorn
...

● 9 years of Ruby on Rails development ● Extensive knowledge in web and mobile development lifecycle ● Skilled in agile and waterfall project management methodologies, SCRUM experience ● Accountable, communicable, dedicated team player, self-motivated, conscientious, creative individual, well-experienced in troubleshooting, able to learn quickly and effectively ● Upper-Intermediate English ● Computer Systems Analyst (Master's degree)

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Seniority Architect/Team-lead
Location Ukraine
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