I am a full-stack blockchain developer working across smart contracts and dApps with over 4 years of hands-on experience. I have worked with 40+ clients, helping turn Web3 ideas into secure, scalable, and production-ready products. My experience spans both EVM-based chains and Solana, where I have delivered DeFi platforms, NFT marketplaces, token ecosystems, and smart-contract-driven automation. I focus on solid contract architecture, security best practices, and efficient execution, while making sure everything integrates smoothly with backend services and modern user interfaces. I work across the full development lifecycle from smart contract design and testing to deployment and frontend integration. Whether it’s launching a new protocol, building an NFT platform, or integrating blockchain features into an existing product, I aim for solutions that are practical, maintainable, and ready to scale. 🛠️ What I Work On I build end-to-end blockchain systems, covering both on-chain logic and off-chain infrastructure. - Smart contract development using Solidity and Rust - Full dApp development with React and Next.js - NFT minting systems and custom marketplaces - DeFi platforms and protocol-level features - Blockchain backend APIs with Node.js, Express, and NestJS - Token creation and standards (ERC-20, ERC-721, ERC-1155) - Smart contract testing and deployment workflows - Blockchain data indexing, automation, and integrations 🔗 Blockchains & Integrations I actively work across multiple ecosystems, selecting tools based on performance and use case. - All major EVM-compatible chains - Solana using Anchor and Rust - IPFS for decentralized storage - Chainlink and cross-chain integrations 📦 Development Stack A production-focused stack built for reliability and long-term maintenance. - Languages: JavaScript, TypeScript, Solidity, Rust, Python - Frontend: React, Next.js - Backend: Node.js, Express, NestJS - Smart Contract Tooling: Hardhat, Remix - Web3 Libraries: Web3.js, Ethers.js, Wagmi - Web3 Platforms: Thirdweb, Moralis - Solana Tooling: Anchor Framework If you are looking for a blockchain developer who values clear communication, clean execution, and long-term stability, I’d be happy to connect. Let’s discuss your project and see how we can move it forward.

I build AI agents, trading systems, and smart contracts that hold up in production. Since 2021: $600M+ in token-migration volume processed by infrastructure I built, grant-funded work for Safe, Arbitrum, Protocol Labs, and Lit Protocol — and launch clients who made back 12.5x what they paid me, within weeks. I work inside Claude Code daily — my own business runs on agentic systems I built with it. You're a perfect fit if you need: ✓ Claude Code & AI agents — MCP servers, RAG pipelines, multi-agent workflows, agents integrated with your CRM/ERP ✓ Trading & prediction-market infrastructure — Polymarket and Kalshi bots, market making, arbitrage, low-latency execution ✓ Smart contracts — Solidity, ERC-4626 vaults, security reviews, gas optimization (Foundry/Hardhat) ✓ Production rescue — your AI-built MVP works in the demo and breaks under real users; I make vibe-coded apps production-grade Recent work: • An AI operations agent that qualifies inbound leads, RAG-matches past work, and drafts proposals in minutes — it helped write this profile • LMSR prediction-market platform on Base — sole engineer: Solidity/Foundry with fuzz, invariant, and mutation testing at 100% coverage, Ponder indexer, NestJS/GraphQL, account-abstraction (ERC-4337) frontend • AI agents for a dental group and an auto dealership (Vapi + OpenAI), integrated with their internal ERPs — both contracts closed 5.0★ (see work history) • ERC-4626 yield vault for a DAO-tooling studio — peaked around $700K TVL • Uniswap v4 hooks — custom hook plus fully on-chain SVG NFTs Proof that isn't self-reported: → $600M+ in token-migration volume Ethereum→Base through Supermigrate (Base grant) → Grant-funded builds: Safe Grants Program $25k (dSafe — published npm SDK), Arbitrum $25k, Protocol Labs $15k, Lit Protocol $10k plus a partnership post on Lit's blog → ~$30M raised by projects launched through Prime Launch → Mainnet deployments across Ethereum, Base, Arbitrum, Optimism, Polygon, Celo, and PulseChain → Every build engagement in five years shipped working software How I work: 1. 30-min discovery call — scope, security requirements, unit economics 2. Working slice in 1–2 weeks — shared repo, tests from day one 3. Security-first shipping — spec review, Foundry/Hardhat suites, static analysis, then mainnet 4. Weekly milestones with metrics you can verify yourself Stack: Claude Code, Claude Agent SDK, MCP, LangChain, LangGraph, OpenAI, Vapi, n8n, Python, TypeScript, React/Next.js, Solidity, Foundry, Hardhat, wagmi/viem, The Graph, Ponder, Flashbots, Polymarket & Kalshi APIs, Ethereum/Base/Arbitrum and other EVM chains. Fixed-scope engagements typically start at $2,500. Not a fit: content-only roles, or teams without clear product requirements. I respond within 2 hours (IST). Every project includes Slack/Discord access, weekly video check-ins, and a repo you own from day one. Click Invite and tell me what you're building. Mihir

• I build smart contracts that go live on mainnet and handle real user funds. • Featured on Upwork's homepage among Top Rated Blockchain & NFT developers. • From designing smart contracts to complete Web3 dApps, I turn blockchain ideas into reality. Hi, I'm a Blockchain Developer and Web3 Engineer with a strong focus on security and scalability. My work includes building smart contracts on both Solana and EVM blockchains using Rust, Anchor, Solidity, Hardhat and TypeScript. I have worked extensively in the blockchain space, developing DeFi apps, NFT marketplaces, token launch platforms, automated tools, custom wallets, pricing modules and advanced Web3 projects that deliver real-world impact. My experience includes: • Solana Smart Contracts (Rust, Anchor). • Ethereum Smart Contracts (Solidity, Hardhat). • DEX, AMM, and DeFi Protocols. • Trading Bots and Automated Trading Infrastructure. • SPL Tokens, ERC-20 Tokens, NFTs, and Token Launches. • Blockchain APIs and Backend Systems. • Staking, Swapping, and Payment Solutions. If you're building on Solana, Ethereum, Base, BNB or Polygon, I can take your project from idea to deployment. My recent work includes: • Building a cross-chain interoperability protocol. • Created an SPL and ERC-20 token contract on both chains with advanced features. • Optimized a Solana trading bot's latency through performance tuning. • Reduced gas costs by 20% through smart contract optimization. If you're looking for a Blockchain Developer who values quality, security and clear communication, let's discuss your project and see how I can help. ································································································································································ Blockchain Developer, Smart Contract Developer, Solidity Developer, Rust Developer, Solana Developer, Ethereum Developer, EVM Developer, Web3 Developer, Full Stack Web3 Developer, DeFi Developer, dApp Developer, Trading Bot Developer, NFT Developer.

10 years of progressive work experience in software development and product management in the fintech industry. Interested in AI and Web3 projects. I design and build AI-powered applications. Hold Bachelor's degree in Computer Science. Live in Calgary, Canada. • AI: Google AI Studio, Gemini API, Imagen for generative image pipelines, Anthropic Claude API, OpenAI API for LLM integration, prompt engineering, AI-powered product development • AI-Assisted Dev Tools: Claude Code, GitHub Copilot, Codex • Web3: Solidity, Foundry, Web3.js/Ether.js, ERC-20, ERC-721, EVM, dApps, DeFi, NFT, Blockchain APIs • Languages: HTML/CSS, JavaScript, TypeScript, JSON, PHP, MySQL, PostgreSQL, Python • Developer Tools: Next.js, Git, Figma, Jira, Trello, Scrum, Cloudflare, Azure, Visual Studio Code

Blockchain Developer and Web3 Engineer with 11+ years, 100% Job Success, and $1M+ delivered on Upwork building smart contracts, DeFi platforms, and AI-powered products. I specialize in: - Smart Contract Development (Solidity, Hedera, Hardhat, EVM, Ethereum, Polygon, Solana) - DeFi Protocols, NFT Platforms & Web3 Integrations - AI Agent Development (LangChain, OpenAI, GPT-4, custom AI agents) - Full-Stack Development: React, Next.js, Node.js, NestJS, TypeScript - Product Discovery, Technical Architecture & Startup MVPs As CTO and Co-founder of SpaceDev, I lead a team of 20+ engineers that has delivered 160+ projects for clients across the US, Europe, and Latin America. SpaceDev is an AWS Partner and a Hedera ecosystem partner, and holds ISO 27001 certification, the security standard enterprise and fintech clients require before engaging a technical partner. I've been a Forbes Technology Council member since 2023, and our work has been recognized by Clutch (51 five-star reviews, Top 4 global blockchain company). Some recent work: - Rarible (leading NFT marketplace): led the multi-chain expansion, migrating core marketplace and collection contracts to Solana and Aptos. - Drata (GRC/compliance platform): built the cross-platform compliance agent and secure audit hub behind a 4+ year technical partnership. - NDAX (Canada's first regulated crypto exchange): rebuilt the platform end-to-end, growing user signups 4x and verification success from 50% to 80%. International speaker on Blockchain and Web3 (Ethereum Argentina, Bitcoin Energy Summit, Blockchain Latam Summit). Tech stack: - Blockchain: Solidity, Hardhat, Ethers.js, Web3.js, Ethereum, Polygon, Solana, Hedera - AI: LangChain, OpenAI, GPT-4, custom AI agents - Frontend: React, Next.js, TypeScript, Redux - Backend: Node.js, NestJS, Express, GraphQL, REST - Databases: PostgreSQL, MongoDB, MariaDB, SQL - Cloud: AWS (Partner), GCP, Firebase, Heroku Certifications & Partnerships: AWS Partner, Hedera Partner, ISO 27001 Certified Looking for a Blockchain Developer, Web3 Engineer, or Smart Contract Developer for your next project? Let's talk. Book a consultation call now.

Hi there! With over 3 years of hands-on experience in blockchain development, I’m passionate about turning great ideas into secure, scalable products that really make an impact. I’ve helped clients launch everything from innovative DeFi protocols to NFT marketplaces and enterprise blockchain solutions — always focused on creating real business value, not just code. 𝐖𝐡𝐲 𝐰𝐨𝐫𝐤 𝐰𝐢𝐭𝐡 𝐦𝐞? 1: 𝐄𝐧𝐝-𝐭𝐨-𝐞𝐧𝐝 𝐁𝐥𝐨𝐜𝐤𝐜𝐡𝐚𝐢𝐧 𝐄𝐱𝐩𝐞𝐫𝐭𝐢𝐬𝐞: Whether it’s writing smart contracts or launching full dApps, I’ve worked across Ethereum, Solana, Polkadot, Cardano, and Hyperledger. I pay attention to both the big picture and the fine details to make sure your project shines. 2: 𝐁𝐮𝐢𝐥𝐝𝐢𝐧𝐠 𝐟𝐨𝐫 𝐆𝐫𝐨𝐰𝐭𝐡: I don’t just write code — I build products designed to scale, engage users, and keep data safe. Your success is my goal. 3: 𝐏𝐫𝐨𝐯𝐞𝐧 𝐑𝐞𝐬𝐮𝐥𝐭𝐬: From startups to big enterprises, I’ve taken projects from ideas to launches on time and aligned with what clients really want. 𝐖𝐡𝐚𝐭 𝐈 𝐛𝐫𝐢𝐧𝐠 𝐭𝐨 𝐭𝐡𝐞 𝐭𝐚𝐛𝐥𝐞: Blockchain & Smart Contracts: Solidity, Vyper, Rust, Plutus, Go, and more Frontend: React, Next.js, Vue.js, TypeScript, TailwindCSS Backend: Node.js, Python, Go, Rust, Express.js, Flask Mobile: React Native, Kotlin, Swift Databases & Storage: PostgreSQL, MongoDB, Prisma, IPFS 𝐈𝐧𝐝𝐮𝐬𝐭𝐫𝐢𝐞𝐬 𝐈’𝐯𝐞 𝐰𝐨𝐫𝐤𝐞𝐝 𝐢𝐧: DeFi: Lending, staking, decentralized exchanges NFTs: Marketplaces, minting, gaming Enterprise: Supply chain, identity, secure data sharing If you’re looking to build a powerful dApp, launch a DeFi platform, or create a custom blockchain solution that fits your business goals, I’d love to chat and see how I can help.

I’m Himanshu, a dedicated 𝐁𝐥𝐨𝐜𝐤𝐜𝐡𝐚𝐢𝐧, 𝐅𝐮𝐥𝐥 𝐒𝐭𝐚𝐜𝐤 𝐚𝐧𝐝 𝐋𝐢𝐠𝐡𝐭𝐬𝐩𝐞𝐞𝐝 𝐃𝐞𝐯𝐞𝐥𝐨𝐩𝐞𝐫 providing clients with dedicated personalized service as an 𝐢𝐧𝐝𝐢𝐯𝐢𝐝𝐮𝐚𝐥 𝐟𝐫𝐞𝐞𝐥𝐚𝐧𝐜𝐞𝐫. I'm actively participating in the development of Blockchain-based solutions for Different industries. Developing a DApp to democratize the global medical device industry. The platform will disintermediate the medical device and supplies ecosystems, Development of Smart Contracts, Real Estate Investments on Blockchain, Gambling/Lottery Game on Blockchain, Donation on Blockchain. My Technical Blockchain Development Expertise: Being a full-stack blockchain developer, I have decent expertise in Blockchain development and custom smart contract application development technologies: 🛠 𝐅𝐮𝐥𝐥-𝐒𝐭𝐚𝐜𝐤 𝐃𝐞𝐯𝐞𝐥𝐨𝐩𝐦𝐞𝐧𝐭: ✔️ Frontend: React.js, Next.js, Vue.js, TypeScript, Tailwind CSS. ✔️ Backend: Node.js, Django, NestJS, Laravel, Express.js. ✔️ Databases: MongoDB, PostgreSQL, MySQL. 💪 𝐓𝐨𝐨𝐥𝐬 & 𝐅𝐫𝐚𝐦𝐞𝐰𝐨𝐫𝐤𝐬: ↔️ Blockchain: Solidity, Rust, Hardhat, Truffle, Anchor, Remix IDE. ↔️ Integration: Ethers.js, Web3.js, Alchemy, IPFS, The Graph, Chainlink. 🔷 𝐒𝐞𝐫𝐯𝐢𝐜𝐞𝐬 𝐎𝐟𝐟𝐞𝐫𝐞𝐝: 💎 Custom token development (fungible and non-fungible). 💎 DApp & DAO creation with seamless wallet integration (MetaMask, Phantom). 💎 Smart contract audits to ensure security and reliability. 💎 Development of DEX platforms and CEX integrations. 💎 Advanced blockchain bot solutions: MEV bots, arbitrage bots. 📈 𝐒𝐩𝐞𝐜𝐢𝐚𝐥𝐢𝐳𝐞𝐝 𝐢𝐧 𝐃𝐞𝐅𝐢 & 𝐍𝐅𝐓𝐬: 🔥 Build platforms like DEXs, launchpads, and crowdfunding systems. 🔥 Develop NFTs with royalties, whitelist, dynamic metadata, and more. 💻 𝐓𝐞𝐜𝐡𝐧𝐨𝐥𝐨𝐠𝐢𝐞𝐬 & 𝐒𝐤𝐢𝐥𝐥𝐬: 👉 Languages: Solidity, Rust, Python, JavaScript, TypeScript, Go, C++ 👉 Frameworks: React.js, Next.js, Vue.js, Django, Express.js, Truffle, Hardhat 👉 Databases: MongoDB, MySQL, PostgreSQL, Firebase 👉 Platforms: Ethereum, Solana, Binance Smart Chain, Polygon, Avalanche, Tron 👉 Tools: Docker, Kubernetes, AWS, Terraform, Alchemy, Brownie ☑️ Blockchain: Solidity, Web3.js, Ethers.js, Truffle, Hardhat, IPFS, Ethereum, Hyperledger, Solana, Binance Smart Chain, Polkadot, Smart Contracts, ERC-20, ERC-721, ERC-1155 ☑️ AI/ML: Python, TensorFlow, Keras, PyTorch, OpenCV, Scikit-Learn, Natural Language Processing (NLP), Computer Vision, Deep Learning, Machine Learning, Data Science, Pandas, NumPy, Jupyter Notebook ☑️ Mobile Development: Native applications using SwiftUI, Swift (iOS), and Kotlin (Android), and hybrid development with React Native, Flutter, and Ionic. 🚀 𝐍𝐨𝐭𝐚𝐛𝐥𝐞 𝐀𝐜𝐡𝐢𝐞𝐯𝐞𝐦𝐞𝐧𝐭𝐬: 🌟 Developed an NFT marketplace with multi-chain capabilities (Ethereum & Solana). 🌟 Built DeFi protocols with staking and liquidity mechanisms, optimizing gas fees by 30%. 🌟 Created cross-chain bridges connecting major blockchain ecosystems. 🌟 Contributed to $10M+ funding raised for blockchain startups. 💬 𝐋𝐞𝐭’𝐬 𝐂𝐨𝐥𝐥𝐚𝐛𝐨𝐫𝐚𝐭𝐞! Click the "Invite to Job" button to start your blockchain journey today! Together, we’ll craft the future of decentralized solutions. 🌐✨ How do we communicate and report? We always prefer to keep our work transparent, and for this reason, we like to be in touch with our valued clients on a daily, weekly & monthly basis. ✅ Upwork Message Board ✅ JIRA ✅ Azure DevOps Server ✅ Asana ✅ Trello ✅ Zoho Projects

• Developed a decentralized trading platform enabling secure, fast, and trustless cryptocurrency exchanges. • Built an automated smart contract system for seamless real-estate transactions, removing intermediaries and reducing processing time. • Created a blockchain-powered supply chain solution that increases transparency, traceability, and operational efficiency across all stages.

As a blockchain developer with 2 years of experience, I have a strong understanding of the fundamentals of blockchain technology, including its architecture, consensus mechanisms, and smart contract development. I specialize in developing decentralized applications (dApps) using blockchain technology and have experience working with a range of blockchain platforms, including Ethereum, Hyperledger, Binance and Solana. During my time as a blockchain developer, I have worked on several projects, including developing smart contracts for supply chain management, implementing blockchain-based voting systems, and creating a decentralized marketplace for digital assets. I have also contributed to open-source blockchain projects and have experience working with blockchain APIs, wallets, and nodes. My technical skills include proficiency in Solidity, JavaScript, Python, Rust and Go, as well as experience with blockchain tools such as Truffle, Hardhat, Ganache, Remix, and Web3.js. I also have experience with DevOps tools such as Docker, Kubernetes, and Git. In addition to my technical skills, I am a strong communicator and a team player. I am comfortable working in an agile development environment and am committed to delivering high-quality code that meets project requirements and deadlines. If you're looking for a blockchain developer with experience developing dApps and working with a range of blockchain platforms, I would be happy to discuss your project and see how I can help.

✅ Blockchain development ✅ Solidity ✅ Rust ✅ Smart contracts ✅ Solana ✅ Ethereum ✅ Web3 ✅ NFT ✅ Crypto ✅ ERC-20 ✅ ERC-721 ✅ SPL ✅ React.js ✅ Backend development ✅ API integrations ✅ Web development ✅ PHP ✅ Plugin development ✅ Payment Gateway Integrations ✅ API development ✅ Web applications ✅ Javascript ✅ Mysql ✅ Linux As a Senior Developer with over 20 years of experience and a Master of Information Technology, I bring a wealth of knowledge and passion to every project. My commitment to writing clean, efficient code and doing things the right way ensures top-quality results. I am fully dedicated to each project, striving for 100% customer satisfaction. My self-organization, quick learning, and motivation drive me to seek out and conquer new challenges. Let’s connect and discuss how we can make your next project a success! #blockchain #solidity #crypto #smartcontracts #backend #linux