Upstaff Developer Profile Directory

All vetted software engineers you need to build AI, Web3, and data Products.

  • Dedicated Full-time commitment for long-term or Time& Material for shorter or ongoing support
  • Europe, Israel, LatAm, United States, Asia geography coverage
  • Remote and hybrid engagement
  • Trial period, no termination fees or hidden costs for transparent and risk-free onboarding.
Solidity
JavaScript
TypeScript
Ethers.js
Node.js
React
Chai
Hardhat
Truffle
Web3
...

- 4 years of experience in Ethereum blockchain and Solidity programming. - 2 years of experience in C , Python programming. - Highly professional blockchain developer with comprehensive accomplishments applying high-security smart contracts to ensure success and achieve goals. - Strong experience in EVM-compatible smart contracts development. Demonstrated success developing and seamlessly executing smart contracts in complex DeFi and DEX structures. - Upper-Intermediate English - Available ASAP

Show more
Seniority Middle (3-5 years)
Location Bauru, Brazil
NFT marketplace
BSC
DeFi
NFT
...

- Helping shape the fast growing blockchain industry.- Digital Assets- Consulting- Native English

Show more
Seniority Senior (5-10 years)
Location Ireland
React
Web3
JavaScript
PHP
TypeScript
Angular
AngularJS
jQuery
Vue.js
CSS
HTML
JSS
Material UI
SCSS
Styled components
Ethers.js
JSX
Mobx
React Hooks
React Native
React-Saga
React Testing Library
React Thunk
Recoil
Redux
RxJs
Webpack
Laravel
Yii
Firebase
MySQL
SQL
Adobe Photoshop
Sketch
Apache HTTP Server
Nginx
CLI
Docker
WordPress
Git
GraphQL
RESTful API
Jest
JMeter
Postman
...

- Senior software developer with about 7 years of experience - Web applications for crypto finance (including wallet for Ethereum using ether.js (deposit, withdrawal, staking operations) and web3.js (connect Metamask, get balance, withdraw and deposit tokens) - Maintaining web applications with Front-end jQuery, Vue.js, React.js, React Native, Angular.JS, Angular 2+ and PHP Laravel, WordPress - Hands-on experience of both working as a single developer and being a part of big Agile teams.

Show more
Seniority Senior (5-10 years)
Location Kharkiv, Ukraine
DeFi
NFT
ETL
Data Warehousing
SQL
Banking
retail
Agile
Scrum
SOAP
Business planning
Development cycle management
Marketing strategies
Project Management
ROI
Scrum Master
CMS
Dapp
Jira
...

- IT project director and startup founder passionate about the banking, fintech, blockchain industries. - Results-driven Product Manager with forward-thinking approach centered on company success and competitive growth. - Record of success in building successful teams and managing different type of project to the market launch. - Experience on working with DeFi, NFT, dApp, Crypto related project and platform launches over highly volatile market within cross-functional teams. - Successfully launched fintech startup and also managed Scrum development team in largest Sweden Bank data warehouse unit. - 7+ years of experience in IT. - Advanced English.

Show more
Seniority Senior (5-10 years)
Location Riga, Latvia
Node.js
JavaScript
CORS 5yr.
HTTP 5yr.
HTML 1yr.
Docker 1yr.
Kubernetes 1yr.
PHP
TypeScript
Angular
Express
NestJS
React
Bookshelf.js
RxJs
CSS
Laravel
Lumen
Yii
AWS DynamoDB
MongoDB
MySQL
PostgreSQL
Redis
Typeorm
AWS
AWS EC2
AWS Lambda
AWS RDS (Amazon Relational Database Service)
AWS S3
GRPC
DEX
microservices architecture
sendgrid
CSRF
Sendbird
...

- Back-end developer with 6+ years of commercial experience; - 4+ years of experience working with Node.js and Express.js; - Good knowledge of work with AWS, Doker; - 5+ years experience working with CORS; - Skills in working with blockchain projects; - Experience working with the DEX project in the field of DeFi; - Deep understanding of creating DB and API structure and implementing app logic; - Good collaboration with the product team to understand requirements and business specifications; - Highly motivated to do amazing products, like to learn new technologies; - Intermediate English; - Available: ASAP.

Show more
Seniority Senior (5-10 years)
Location Ukraine
Go
AI
OpenAI
Rasa
PHP
Solidity
Temporal
Ethers.js
Express
Node.js
React
Gorilla Mux
GORM
Symfony
Yii
ML
AWS ElasticSearch
MongoDB
MySQL
PostgreSQL
Redis
SQL
AWS
Azure Key Vault
Ansible
Helm
Jenkins
BigCommerce
Magento 2
Cypress
Mocha
Docker
Kubernetes
Terraform
ETH (Ethereum blockchain)
Hardhat
OpenZeppelin
Truffle
Git
GraphQL
OAuth
Jira
Redmine
Kafka
NATS
RabbitMQ
Kanban
Scrum
Linux
BFT
Codeception
go-chi
HashLips
Jetbrains GoLand
Mockery
Mux
Sphinxsearch
...

- Developer with 11+ years of experience; - Developing web applications using PHP, JavaScript, Golang; - Experience with Blockchain and smart contracts; - Solid experience with MVC architecture-based Web Application Development; - Excellent knowledge of common software engineerings practices, like OO principles, modern design patterns, test-driven development, continuous integration, and continuous deployment; - Experience in building database architecture; - Hands-on experience with writing WEB-services (REST); - Has experience in Architectural approach discussions, design, and decision-making (feature/component level); - Estimation decision-making delivery management cross-team technical communication task; - Extensive experience in mentoring specialists, making code review; - Strong analytical skills, well knowledge of math, high level of responsibility; - Quick learner, team player, goal-oriented and responsible; - Upper-Intermediate English; - Available ASAP.

Show more
Seniority Senior (5-10 years)
Location Ukraine
React 2yr.
Mobile development 2yr.
MERN stack (MongoDB, Express, React, Node) 2yr.
AWS 2yr.
ETH (Ethereum blockchain)
GameFi
NFT
NFT marketplace
Smart Contract
Solana
...

Highly self motivated individual seeking for an opportunity to work in challenging environment. I'm passionate about new technologies and continuously try to learn and prove my worth in those sections. I'm well versed in numerous programming languages and technologies from both web2 and web3 i.e. blockchain technology. Got a proven experience working on blockchain technology.

Show more
Seniority Senior (5-10 years)
Location Lahore, Pakistan
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 ~_~

Show more
Seniority Senior (5-10 years)
Location Toronto, Canada
React 4yr.
Node.js 3yr.
NestJS 1yr.
Java
JavaScript
PHP
Solidity
Swift
CSS
HTML5
jQuery
Laravel
React Native
Firebase
MongoDB
MySQL
SQLite
ETH (Ethereum blockchain)
Smart Contract
...

- 7+ years of experience in the IT industry - Mobile & Web developer - Intermediate English

Show more
Seniority Middle (3-5 years)
Location Sapporo, Japan