Hire Vetted Blockchain Engineers at Upstaff - Page 2
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.
Blockchain
All
Web Application
Data and Analytics
Cloud and Operations
Mobile Application
Digital Platforms
Blockchain
Design and Creative
Quality Assurance
Project Management
Desktop Application
Writing and Translation
Scripting and Automation
Marketing and SEO
Embedded Systems
Low-Code and No-Code
GameDev
Industrial Engineering
Smart Contract 8yr.
Blockchain 6yr.
Rust 5yr.
Solidity 5yr.
Go
Software engineer with a Bachelor’s in Computer Science and 8 years of experience specializes in blockchain development, smart contracts, and DApps, mainly in Solidity and Rust. Demonstrated expertise in Ethereum and Solana ecosystems with significant projects such as a fully-featured NFT marketplace and the first multichain swap protocol. Excelled in developing secure, scalable solutions with 99% test coverage in Rust, contributing to the advancement of decentralized protocols. Adept in various technologies including Go, Move, Web3, DeFi, and smart contract auditing, positioning as a valuable asset for blockchain-centric roles.
Senior
Zagreb, Croatia
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
Senior
United States
Scrum
Agile
Product manager with experience in NFT project.
- Almost 9 years of diverse experience in tech: Product Management, Agile Project Management and Business Analysis.
- Upper-intermediate English.
- Available ASAP
Senior
Melbourne, Australia
React 9yr.
Blockchain 2yr.
Spring Boot
Gemini 3
OpenAI
I am a senior software architect and blockchain automation engineer , with over 20 years of professional development experience and 4+ years dedicated to crypto, trading bots, WebSocket systems, and SaaS automation platforms.
My career spans enterprise systems, mobile applications, cloud analytics, authentication infrastructure, and large-scale data platforms — evolving into high-performance blockchain automation and bot engineering across Solana and Ethereum ecosystems.
I specialize in building:
- Real-time token tracking systems
- Telegram trading bots
- Solana Token Bundling, Deployment and tracking platforms,
- Rug detection & dev-sell intelligence
- MongoDB-driven analytics platforms
- Event-driven SaaS backends
All systems are designed for 24/7 uptime, restart persistence, and real trader usage — not prototypes.
Core Expertise
Blockchain & Crypto
- Solana Web3.js
- Ethereum (EVM)
- Pump.fun SDK
- Token metadata indexing
- Market cap & liquidity tracking
- Dev-sell detection
- Rugpull analysis
- ATH / ROI analytics
- Wallet behavior monitoring
Bot & Automation Systems
- Trading bots
- Token sniper trackers
- Telegram bots
- Volume simulation bots
- Alert engines
- Subscription lifecycle managers
Real-time ranking systems
Expert
MS SQL Server Management Studio
Unreal Engine
Linea
Azure VM
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.
Expert
Node.js 2yr.
NestJS 2yr.
RESTful API 2yr.
GraphQL 1yr.
Web3.js 1yr.
Experienced Backend Developer with a strong foundation in Computer Science and over 3 years in fintech, Web3, and real estate domains. Proficient in TypeScript, NestJS, PostgreSQL, MongoDB, and blockchain tools such as Web3.js and Ethers.js. Led major projects including Bloomvest V2 migration to PostgreSQL and scalable API design, Trilla's real estate fractional ownership platform, and high-performance blockchain indexers. Skilled in modular architecture, real-time communication via WebSockets, and secure multi-role backend systems, delivering robust, scalable decentralized and centralized applications.
Architect/Team-lead
Abuja, Nigeria
Rust
Azure Blockchain
Smart Contract
SOLID
Web3
Accomplished Full Stack Blockchain Developer with over 9 years of experience in the industry, specializing in the integration of Web3, Rust, Solidity, and other technologies to create innovative blockchain solutions and decentralized applications (DApps). Expertise in front-end and back-end development evidenced by projects like BIMA and Bitcross, with skills in JavaScript, React JS, Node.js, and database management. Adept in building robust smart contracts on various blockchains such as EVM, Solana, and Arch Network, having contributed to key projects including Bitflow, Nimbus, and Trustbet. A solid computer science foundation from Rajiv Gandhi Technical University bolsters a career marked by technical proficiency and readiness for team collaboration as well as independent work. Proven track record of leveraging full-stack development capabilities and deep blockchain knowledge to meet and exceed project requirements.
Senior
Ahmadabad, India
JavaScript 4yr.
TypeScript 4yr.
React 4yr.
Ext JS 4yr.
Node.js 4yr.
Expert Full-stack Developer with advanced capabilities in TypeScript, React/Next.js, and Node.js. Possesses a Bachelor's in Computer Science and has taken specialized courses in Full-stack development and blockchain technologies, reflecting a commitment to continual learning. Proven track record in building and scaling high-load applications, particularly in the healthcare, media, and decentralized tech sectors. Demonstrates strength in creating responsive UIs, implementing complex back-ends, and ensuring high code quality through rigorous testing. Technical skill set includes modern JavaScript frameworks, RESTful and GraphQL APIs, microservices, and cloud services (AWS, GCP), supplemented by practical knowledge of SQL/NoSQL databases, Docker, and CI/CD pipelines. Fluent in essential industry practices and proficient in English and several other languages, making for a versatile asset in international and cross-functional teams.
Middle
Germany
Solidity
React
Blockchain
Smart Contract
Architect/Team-lead
United States
Blockchain
I am a seasoned blockchain developer with proven experience in building, optimizing, and scaling projects across multiple layers and ecosystems.
Beyond development, I also bring strategic connections and marketing expertise to help projects succeed from launch to adoption.
Senior
Odesa, Ukraine
Java
C/C++/C#
PL-Sql
JavaScript
A well-rounded software engineer with a National Diploma in IT and diverse experience across several tech domains. Engineer possesses expertise in a range of programming languages like Dart (Flutter), Java, C#, and PL/SQL, and is also proficient in data automation tools including Power BI, Tableau, and VBA. They have a proven track record in database administration, test automation, and system integration, demonstrated by their work with enterprise clients and contributions to national innovation projects. Notably, the engineer has developed AI-powered platforms and fintech solutions, showing a commitment to innovation and problem-solving. Their methodologies include Agile and SDLC, ensuring efficient and effective project execution. With certifications in modern frameworks and technologies like Hashgraph and BDD testing, the engineer's technical acumen is well-established.
Junior
South Africa
SOLID 8yr.
DeFi
Cross Chain Bridges
Smart Contract
Azure DevOps
Dynamic Senior Blockchain Developer with over 8 years of experience in building and deploying enterprise-grade blockchain applications. Proficient in Solidity and Rust, expertly crafted DeFi protocols managing $75M+ TVL and facilitated $100M+ in cross-chain volume. Proven leadership in guiding engineering teams to deliver high-performance technologies such as a network bridge for Solana-Ethereum interoperability and Cosmos SDK chains. Innovated within the blockchain space by implementing TSS/MPC for secure transactions, designing advanced Layer 2 scaling solutions, developing DEX platforms, and ensuring system robustness through comprehensive DevOps practices. Educated in Computer Science from Sonoma State University, this engineer brings a wealth of knowledge in blockchain frameworks and protocols, programming languages including Solidity, Rust, and Go, as well as cloud infrastructures like AWS/GCP, underpinned by a command of software development methodologies.
Expert
Python 5yr.
TypeScript 5yr.
C/C++/C#
Robot Framework
Dart
Software engineer with a strong focus on AI integration and full-stack web solutions. A proven track record in building AI-powered tools and automating core processes, coupled with expertise in cross-platform development and containerization. Extensive experience with Python, Docker/Nginx, and deploying reliable APIs. Actively pursuing a Bachelor's in Computer Science and excelling in hands-on roles such as Software Research Engineer. Achievements include reducing log review time by 70% and improving customer agents' response rate from 45% to 85%. Adept in languages like C/C++, JavaScript/TypeScript, and possesses advanced skills in frameworks like Django and ReactJS.
Middle
Lagos, Nigeria
Dart 2yr.
Facebook Auth 2yr.
Clean Architecture
MVVM
Packet Tunnel Provider
Software engineer with specialized expertise in Flutter development for multi-platform applications. Experienced in leading cross-functional teams and optimizing app performance, with hands-on experience in architecture and advanced project management systems. Technical proficiency in Dart, along with familiarity in C++, JavaScript, TypeScript, and a variety of Flutter frameworks and architectures. Proven record in developing high-traffic, secure applications with a focus on user experience, contributing to substantial growth rates in user base and sales. Strong foundation in computer science with a biotechnology and pharmacy degree, underpinned by effective problem-solving skills showcased through the completion of 200+ Leetcode problems.
Middle
Alexandria, Egypt
RESTful API
JavaScript
TypeScript
Seasoned Product Manager and former Research Staff with extensive IT experience, specializing in accessibility and adept in modern programming languages and tools. Notable for leading the development of assistive technology products and contributing to inclusive technology initiatives. Proven experience in API optimization, problem-solving in server-client communication, and enhancing application security using Azure Key Vault. Strong educational foundation with a Bachelor of Engineering in Computer Science and an MBA in Systems. Recognized for technical leadership, strategic project management, and analytical prowess in high-stakes environments.
Expert
Hyderabad, India
Solidity 5yr.
Java 5yr.
Solana 2yr.
- 7+ years of experience building scalable Web3 applications and DeFi platforms with Solidity, Rust, and Java in Blockchain, DeFi, NFT Tokenization, Fin-Tech domains
- Strong expertise in smart contract development across Ethereum, Polygon, Solana, and Hedera, using ERC standards, Anchor, and Foundry
- Designed and optimized zero-knowledge circuits (ZKPs) and decentralized identity systems (DID) for privacy-preserving applications
- Integrated oracle networks (Chainlink, Pyth) and implemented advanced DeFi mechanics: yield farming, auto-compounding, AMMs, and on-chain governance
- Developed secure and gas-efficient smart contracts using EIP-712, proxy patterns, and off-chain signature schemes
- Built robust backend and API layers (Node.js, Java, GraphQL) with optimized database performance in PostgreSQL and MongoDB
- Delivered full-stack dApps with seamless wallet integration (MetaMask, WalletConnect, HashPack) and deployed them on Vercel / AWS
- Contributed to CI/CD, testing, and code quality using Hardhat, Slither, TestContainers, Jenkins, and GitHub Actions
Senior
Warsaw, Poland
Solidity 4yr.
Solana 1yr.
- Blockchain Developer with 5 years of experience building decentralized applications (dApps) using Solidity and Rust across EVM-compatible chains (Polygon, BSC, Base) and Solana.
- Proficient in frameworks such as HardHat and Anchor for developing, testing, and deploying smart contracts, with hands-on experience integrating wallets like MetaMask and working with DeFi protocols including Uniswap, Aave, and Alpaca Finance.
- Experienced in implementing and customizing token standards such as ERC-20, ERC-721, ERC-721A, and ERC-1155, as well as secure signing mechanisms via EIP-712.
- Skilled in smart contract auditing and fuzz testing using tools like Slither, Mythril, and RustSec, ensuring robust and secure codebases.
- Adept in version control and collaboration using Git and GitHub, with a focus on maintainable and testable code.
- Experienced in blockchain data indexing and integration using The Graph/Subgraphs, enabling efficient access to on-chain data across applications.
- Well-versed in cross-chain development and decentralized identity (DID), contributing to secure, scalable, and user-centric Web3 ecosystems.
Senior
Warsaw, Poland
Rust 2yr.
Solana 2yr.
- 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
Senior
Warsaw, Poland
Python 8yr.
Django 7yr.
Django REST framework 7yr.
SQL
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.
Senior
South Africa
FPGA
VHDL
C/C++/C#
Python
Embedded Systems
- 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.
Expert
Kyiv, Ukraine
$30/hr
$5000/month
$5000/month
React
Vue.js
Angular
Next.js
Nuxt
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 ~_~
Senior
Toronto, Canada
JavaScript 5yr.
Swift 5yr.
FDD 5yr.
Node.js
React
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.
Senior
React Native
React
- 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
Senior
Armenia
PHP 9yr.
JavaScript 9yr.
MySQL 9yr.
Solidity
- 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.
Senior
Ukraine
Go 3yr.
Python 1yr.
TypeScript 1yr.
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
Middle
Project Management 5yr.
MS SQL Server Management Studio 5yr.
Unreal Engine 4yr.
DigitalOcean 4yr.
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.
Middle
Manchester, United Kingdom
Go 14yr.
React
JavaScript
PostgreSQL
- 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.
Expert
Kharkiv, Ukraine
Node.js 8yr.
Web3.js 4yr.
Solana 2yr.
EthereumJS 2yr.
React
- 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.
Senior
Warsaw, Poland
Rust 2yr.
Solidity
- 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.
Senior
Singapore
Web3
Node.js
NestJS
PostgreSQL
AWS
- 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.
Senior
Ukraine