Hire Top Vetted Blockchain Engineers at Upstaff - Page 1

- Senior Blockchain Engineer with 20+ years in software development and a strong track record in the Solana ecosystem; - Experienced in Rust for Solana smart contract development, with extensive experience building on-chain programs for DeFi, staking, NFT, and messaging platforms; - Skilled in full-stack development: React and TypeScript for front-end dApps, Node.js and Python for backend systems; - Experience with AWS and Google Cloud for scalable cloud applications and infrastructure; - Ability to lead teams and manage projects, including migrating Ethereum products to Solana (Community Gaming); - Skilled in blockchain frameworks and tools: Anchor, CPI, Metaplex, Token-2022; - Strong SQL background with hands-on experience in PostgreSQL, MySQL, and SQLite; - Experienced in system architecture, Linux server administration, and distributed applications; - Notable achievements include leading Solana product delivery for NeuralBond (on-chain messaging) and Palus Finance (staking platform).

10+ years of experience in web development, M.Sc in Software Engineering, GAI, LLMs 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.

- 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.

- 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

• 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;

- 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

- 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.

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.

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.

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.

Senior Software Engineer with a BSc in Computer Science and over 10 years of experience specializing in Python, Django, JavaScript, React, TypeScript, and cloud platforms like AWS and Azure. Demonstrated ability in creating scalable microservice architectures and developing high-performance backend services, with a keen eye for front-end user experiences. Proficient in deploying applications using CI/CD pipelines and proficient in database management with systems such as PostgreSQL. Successfully evolved ML workflows in FinTech, eCommerce, and AI, enhancing operations and boosting performance.

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.

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.

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.

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.

- 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

- 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.

- 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

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.

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.

- 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.

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.

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.

- 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.

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 ~_~

- 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.

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.

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

- 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

- 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.

- 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.

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