Hire the Best Blockchain Developers in Kolkata, IN

I've architected a full Layer-1 blockchain from scratch consensus, validators, staking and built AI agents that transact on-chain autonomously. 100% Job Success, every rated project 5 stars. I'm a Blockchain & AI Developer who ships complete products end-to-end: smart contracts, backends, web dApps, and mobile apps. Clients come to me when they need one developer who understands the full stack from on-chain logic to the app store. WHAT I DELIVER Agentic AI & On-Chain Payments — Autonomous AI agents transacting via the x402 protocol: machine-to-machine micropayments, zero human intervention. Built with LangChain, CrewAI, and LLM APIs. Custom Layer 1 Blockchains Complete chains with consensus, validator infrastructure, staking economics, block explorer, and faucet delivered with UAT reports and scaling roadmaps. Solana Development Anchor programs and MEV-aware trading systems with Jito bundle execution, backed by NestJS/PostgreSQL. Full dApp Development NFT marketplaces, DeFi tools, token platforms across Ethereum, Polygon, and EVM chains wallet integration to polished frontend. Mobile Apps Cross-platform Flutter apps with Web3 integration, including a multilingual P2P crypto trading platform with USDT escrow. AI Products & Automation LLM-powered systems, multi-agent workflows, AI fact checking infrastructure, and intelligent automation pipelines. Enterprise Integration Hyperledger Fabric systems, including edge-device deployments with tamper-proof data integrity. STACK Rust • Solidity • C++ • TypeScript • Python • React/Next.js • Node.js/NestJS • Flutter • Anchor • Web3.js • LangChain • CrewAI • IPFS • Hyperledger • PostgreSQL • MongoDB HOW I WORK Clients hand me a problem statement, not a spec and receive a production system with documentation, testing reports, and a roadmap. Recent feedback: "very professional and fast, will hire again." Whether it's a smart contract, a full dApp, a mobile app, or an AI agent system I build it production-ready. Let's scope your project.

Hi ,I have been an CS engineer for more than 5 years, specializing in Blockchain technologies , Web Automation, MEV bots development, HFT sys Development, WEB3, DevOps , and API of other Services. I Have experience in developing Complex MEV searchers that follows advance grim-trigger and p2p propogation latency strategies to compete with other bots on blockchain and make profitable transactions by constantly monitoring the Mempool,developed in JavaScript, Golang, Rust, C++, and Solidity. I am highly responsible for my work and attentive to little details. I can help you create a custom profitable bot. Built MEV bots that could make Inblock arbitrage on eth blockchain across 42 Decentralized exchanges. Scaled it to base Ranked Amongst top 3 arbitrage bot on eigenphi multiple times . BETFAIR/BETINASIA EV+ trading strategies Built a strategy to optimally lay bets on crossover points and trade odds with a positive expected value amongst betting exchanges like Betfair and Betinasia . Made bots to make arbitrage across soft bookies like William hill, paddy power ,unibet , bet365,cloudbet ,betinasia . Built bots to trade near certainty bond scalping on markets like POLYMARKET AND KALSHI. Let me bring my skills and experience to your project and help drive success as a senior blockchain developer on Upwork. 🤖 Innovator / Analytical Thinker / Quantitative Analyst / HFT(high frequency trading) sys expert Tech Stacks: Golang/ C++ / solidity /JavaScript / YUL/ Node.js/ Cheerio / Nightmare.js TypeScript / Python / Rust / SQL / jQuery / / Azure DevOps / CSS3 / React.JS / Redux / Mongo DB /Express / Mongoose / PHP / HTML5 / MySQL / Macro / Machine Learning / Deep Learning / TensorFlow / MATLAB / Azure Cognitive Services / Blockchain Technologies Development / Blockchain Development Services: -MEV Bot on ETH,BSC,AURORA (Advance Sandwich bots , front running bots ,spatital arbitrage bots,statistical Arbitrage bots , NFT sniping BOTS) -Complex MEMPOOL Analysis ,Flashloan YEILD FARMING BOT -Blockchain developments (Custom ERC 721 ,ERC 721-1 Smart contract development,NFT generator with metadata ,Minting Dapps, NFT website ,Staking contract etc) -Algo trading Bots on Binance,Bitmex,KUCOIN,Etc(Stocks / Crypto)along with UI. -Customized smart contracts for Dapps -Dashboards & Metrics -Microsoft Machine Learning, Google Assistant SDK, Deep Learning Options trading Deribit,IBKR options trading bot WEB Automation Services: -Data scraping and Mining -Webscraping Dynamic websites using puppeteer -Browser Automation -Sneaker Sniping bot Financial Services: -Financial Modeling -Algorithmic Trading Development -HFT analysis -Backtesting trading strategies & strategy optimization -MEV arbitrage strategies - statistical models for risk management -Polymarket vs Kalshi arbitrage -Market making and slippage optimization -convex optimizations for optimal trade sizes - stat arb strategies

🚀 Full-Stack & Blockchain Developer | DApp Architect | Financial Tech Specialist I'm a results-driven full-stack developer with 7+ years of experience building robust front-end and back-end systems, architecting blockchain-based decentralized applications (DApps), and integrating complex financial analytics into scalable platforms. My expertise spans across JavaScript, Node.js, React, Solidity, and Web3 technologies—empowering startups and enterprises to launch secure, high-performance applications. 🔧 What I Bring to the Table: 1. End-to-end development of web and mobile applications using React, Next.js, Node.js, and Express. 2. Smart contract development and DApp integration on Ethereum, Polygon, and BSC using Solidity, Hardhat, and Web3.js. 3. API integration for financial platforms (e.g. Fyers, trading indicators like SuperTrend). 4. Predictive modeling and data visualization for financial analytics. 5. Scalable architecture design with MongoDB, PostgreSQL, and Redis. Deployment expertise with AWS, Vercel, Docker, and CI/CD pipelines. 💡 Whether you're launching a DeFi platform, building a trading dashboard, or need a reliable developer to bring your app idea to life—I deliver clean, optimized code with a focus on performance, security, and user experience. Let’s build something powerful together.

I am a Full Stack Engineer with three years of professional experience delivering innovative solutions across various tech stacks. I graduated in 2022 from the Indian Institute of Information Technology, one of India's premier institutes, with a bachelor's degree in Computer Science and Engineering. I specialize in building scalable, maintainable, and end-to-end systems, with a strong focus on developing robust backend servers. As a full-stack developer, I have a solid foundation in the JavaScript ecosystem, creating responsive websites with Next.js, React, Tailwind CSS, and Chakra UI. On the backend, I construct reliable APIs and services using TypeScript and Node.js. My professional experience includes significant contributions to a US-based Orthodentistry SaaS company, where I developed payment systems and implemented solutions using technologies like React, Vite, Hasura, GraphQL, PostgreSQL, as well as AWS services such as EBS, EC2, and Lambda. This role honed my skills in building enterprise-grade SaaS products with an emphasis on security, scalability, and performance. Additionally, I have developed a strong expertise in systems programming with Rust and Axum, creating resilient backend solutions that are designed to handle high loads and complex operations. I have also worked with frameworks like Langchain to integrate AI-driven functionalities, complementing my experience in building complete, end-to-end systems. I am flexible with time zones and can effectively collaborate with teams in the US, South America, and Europe, ensuring seamless communication and project delivery across different regions. This diverse skill set allows me to design and implement powerful backend infrastructures that drive innovation and enhance user experience.