I'm a Full-stack Blockchain and Smart Contract Developer with 9+ years of experience building secure, scalable, and innovative Web3 products from DeFi platforms and DAOs to crypto exchanges and ZK integrations using Python and GoLang. I combine hands-on development with real-world insight as an active crypto trader on platforms like Binance and Poloniex, bringing a deep understanding of both blockchain technology and market dynamics. 🔐 Smart Contract Development & Auditing (EVM, Solana, ZK): ▪ EVM-compatible chains: Ethereum, Arbitrum, Optimism, Base, BNB Chain, Polygon ▪ Solana: Rust, Anchor, SPL tokens, Phantom wallet integration ▪ Token standards: ERC-20, ERC-721, ERC-1155, SPL ▪ Back-End Development: Node.js, Python, Nest.js, MySQL, RESTful APIs, GraphQL, and server-side integration ▪ Front-End Development: React.js, Next.js, Vue.js, Nuxt.js, HTML5, CSS3, and JavaScript (ES6+) Database Management: SQL, MySQL, PostgreSQL, MongoDB 🏗️ Blockchain Product Development: ▪ DApps for DeFi, NFTs, DAOs, DePIN, and enterprise use cases (logistics, healthcare, insurance, banking) ▪ Full-stack dApp development: Python, Golang, React.js, Next.js, Tailwind, TypeScript ▪ Web3 integrations: ethers.js, web3.js, viem, wagmi, RainbowKit ▪ Protocols & tools: IPFS, The Graph, Chainlink, Pyth 📈 Crypto Platforms & Trading Systems: ▪ Multi-currency wallets (hot/cold) using native nodes or APIs (Coinbase, Fireblocks, BlockCypher) ▪ Crypto exchanges with real-time trading, KYC/AML, order books, and secure Web3 integration ▪ Fiat-to-crypto gateways with Stripe, PayPal, and credit card support ▪ Swap services via DEX APIs (e.g., ShapeShift, Changelly) ▪ Market tracking platforms with live charts and portfolio tools ▪ Mobile crypto wallets: Flutter, React Native, Swift, Kotlin ▪ RESTful APIs & WebSocket services for external integrations ▪ Cross-platform desktop apps for Windows/macOS/Linux AI Automation Tool: Claude, Make, n8n 🧠 Leadership & Consulting: Sprint planning, technical documentation, and developer onboarding Code reviews, PR management, and mentoring junior engineers Tools: GitHub, JIRA, Trello, Slack, Notion Whether you're launching a new dApp, building a trading platform, or need a smart contract audit. I deliver clarity, security, and execution to turn ideas into reliable Web3 products.

Hi, I’m Sheikh Wasif — a Full-Stack & Blockchain Engineer with 5+ years of experience building production-grade platforms used by real users, handling real liquidity, and running at scale. I specialize in designing and delivering secure, scalable, and high-performance applications across Web2 and Web3 — from concept to deployment. Whether you need a complex DeFi protocol, a cross-chain system, or a full MERN application, I can architect and ship it end-to-end. What I Bring • Built and scaled platforms handling millions in volume and TVL • Led engineering teams of 10+ developers • Delivered production-ready systems with audit-level code quality • Expert in performance optimization, upgradeable architectures, and real-time systems Technical Expertise Blockchain & Web3 • Smart Contracts (Solidity, Rust/Anchor) • DeFi, NFTs, DAOs, Launchpads, Prediction Markets • Account Abstraction (EIP-4337) • Cross-Chain: LayerZero, Wormhole, Axelar, CCIP • Ethereum, Solana, L2 chains, Custom EVM chains Full-Stack Development • MERN Stack (MongoDB, Express, React, Node.js) • Next.js, Nest.js • REST APIs, GraphQL, WebSockets • Event-Driven Architectures Infrastructure & Tooling • Docker, AWS, CI/CD • Foundry, Hardhat, Slither testing • The Graph, Dune analytics • Real-time indexing systems What Clients Hire Me For • Protocol architecture & system design • Smart contract development + optimization • Secure cross-chain integrations • Backend systems for blockchain apps • Scaling existing products • Debugging complex Web3 issues Why Clients Like Working With Me • Clear communication & fast responses • Clean, maintainable code • Strong documentation • Strategic technical thinking (not just coding) • Reliable delivery Let’s build something powerful. If you need a developer who understands both the technical depth and product vision of your project — message me and let’s discuss.

I am a Full Stack Developer with strong expertise in building scalable, secure, and high-performance web applications. My work covers everything from modern frontend UIs to robust backend APIs and cloud-native deployments, allowing me to deliver complete end-to-end solutions for businesses and startups. ✅ Frontend Development - React.js, Next.js, Vue.js for responsive, component-driven interfaces - TailwindCSS, shadcn/ui, Material UI for clean and consistent design systems - Three.js, Framer Motion, and Lottie for interactive 3D visuals and animations - Performance improvements through code splitting, lazy loading, and caching ✅ Backend Engineering - Node.js (Express, Nest.js) and Python (Django, FastAPI) for REST/GraphQL APIs - Java (Akka) and C# for concurrent backend services and custom modules - PostgreSQL, MongoDB with Prisma and Drizzle ORM for type-safe, optimized data modeling - Redis for caching, pub/sub, and real-time event streaming - RabbitMQ for message queues and async processing - Protocol Buffers and gRPC for low-latency inter-service communication - Authentication, authorization, and role-based access control for secure systems ✅ DevOps & Cloud Infrastructure - Dockerized microservices orchestrated with Kubernetes for scaling and reliability - AWS (EC2, ECS, S3, CloudFront, CodePipeline) and GCP for production deployments - Nginx for reverse proxy, SSL termination, and load balancing - Terraform and Ansible for Infrastructure as Code and reproducible environments - CI/CD pipelines (GitHub Actions, GitLab CI/CD, AWS CodePipeline) for automated releases - Monitoring and observability with Grafana, ELK, and Prometheus ✅ Web3 Integrations (when required) - Wallet authentication (MetaMask, WalletConnect) for web apps - Secure integrations with smart contracts using Web3.js/Ethers.js - NFT support, royalties, and tokenized transactions inside web platforms ✅ Why Clients Hire Me I’ve delivered platforms like Gameree, Dopewarz, and Antara, along with multiple SaaS-based projects where I handled the frontend, backend, and infrastructure. From designing responsive user interfaces to implementing real-time features, optimizing databases, and deploying cloud-ready applications, I ensure the systems I build are scalable, secure, and production-ready from day one. If you need a developer who can own the full lifecycle of your product and optionally extend it with Web3 functionality, I’d be glad to help. #FullStackDeveloper #Blockchain #SmartContracts #Solidity #Web3 #NFT #DeFi #MERNStack #DevOps #AWS #Docker #Kubernetes #GameFi #NFTMarketplace #Microservices #Ethersjs #Web3js #HighScalability #SecureDevelopment #CI_CD #React #Nodejs #PlayToEarn #Nestjs #Next #JavaAkka #Elk #Rust #Solana #Metamask #Phantom

I work as a Full Stack Developer, Web3 Developer and Blockchain Developer building production-ready applications that connect business logic with blockchain infrastructure. As a Web3 Developer, I focus on wallet integrations, smart contract interactions, and scalable dApp architecture. As a Blockchain Developer, I design and implement secure, efficient systems on top of modern blockchain networks. As a Full Stack Developer, I ensure everything works end-to-end, from frontend to backend, clean, scalable, and maintainable. As a Web3 Developer, Blockchain Developer, and Full Stack Developer, I’ve worked on real-world products involving NFT platforms, DeFi systems, and exchange-related applications. My main specialization as a Web3 Developer and blockchain developer is building integrations between applications and blockchain networks, including wallet connections, contract execution, and real-time data handling. I work deeply with blockchain infrastructure, ensuring applications behave reliably under real user conditions. The projects I’ve worked on include: - NFT platforms as an experienced nft developer: landing-based apps, SPA and multi-page applications, NFT marketplaces, hybrid exchange systems, and Uniswap forks - Smart contract integrations as a Blockchain Developer: contract interaction using web3 and ethers libraries, handling transactions, events, and contract state as a smart contract engineer - Wallet integrations as a Web3 Developer: Metamask connections, custom Web3 context implementations, and secure interaction flows - Backend systems as a Full Stack Developer: building services with Node.js and TypeScript, working with MongoDB (Mongoose), PostgreSQL (Supabase), and Prisma for NFT data and application logic - Blockchain data querying as a Blockchain Developer: using Apollo Client with Uniswap subgraphs to fetch and process on-chain data efficiently - Gas optimization as a Web3 Developer: creating services that fetch gas price predictions and apply them to outgoing transactions - Exchange integrations as a Full Stack Developer: working with Binance API, order creation, and financial workflows As a Web3 Developer and Blockchain Developer, I have strong experience working with solidity, including creating ERC20 mintable tokens and handling contract deployment pipelines with Hardhat. As a Blockchain Developer, I have also handled migration of NFT systems from Ethereum to non-Ethereum environments, adapting logic, contracts, and integrations accordingly. As a Web3 Developer, I ensure compatibility across different chains and environments. On the frontend, as a react developer and web developer, I build modern, responsive interfaces using React, Next.js, and TypeScript. I’ve worked with Material UI, styled-components, Bootstrap, SCSS, and CSS modules, ensuring clean UI systems and maintainable code. On the backend, as a Full Stack Developer, I design APIs, manage data flows, and ensure consistency across distributed systems. I’ve also worked with state management (Redux, Redux Toolkit, redux-localstorage-simple), data layers (Prisma, MongoDB, PostgreSQL), and tooling (ESLint, Prettier), ensuring code quality and long-term maintainability across projects. As a Web3 Developer, Blockchain Developer, and Full Stack Developer, I focus on performance, reliability, and scalability. Many blockchain products fail not because of the idea, but because of weak implementation. As a Web3 Developer, I make sure integrations with wallets and smart contract systems are stable and predictable under real usage. As a Blockchain Developer, I focus on transaction correctness, contract behavior, and data consistency. As a Full Stack Developer, I ensure the entire system behaves correctly across frontend, backend, and infrastructure. In addition, as a Web3 Developer, I work on improving UX around blockchain interactions, reducing friction for users interacting with nft platforms and contract-based systems. As a Blockchain Developer, I focus on writing efficient and maintainable solidity code. As a Full Stack Developer, I connect all layers into usable, scalable products. Beyond blockchain, my broader experience as a web developer, wordpress developer, and mobile app developer allows me to approach projects from a full product perspective, ensuring usability, performance, and scalability in real-world conditions. I continuously improve as a Web3 Developer, Blockchain Developer, and Full Stack Developer, staying up to date with modern tools, frameworks, and best practices across blockchain and web development. If you’re looking for a Web3 Developer, Blockchain Developer, or Full Stack Developer to build NFT platforms, smart contract systems, or scalable applications connected to blockchain, I can help deliver a reliable, production-ready solution.

🏆 Top Rated · Top 10% · 100% Job Success Score 🌐 Forbes Technology Council Member 🌍 Dubai & Singapore · Serving US, UK & Gulf clients I build products that ship, scale, and make money. 10+ years across AI, blockchain, full-stack development, and product design. I've taken projects from whiteboard to production across healthcare, real estate, fintech, Web3, and hospitality. Live products with real users. What I've shipped: 🤖 Confirmlyai - AI voice and chat booking platform, 33 clinics across UAE, no-shows down 21% last month 🏠 Hutfin - real estate marketplace, YCombinator selected, $5M pre-seed raised 🎮 VAF Gaming - NFT marketplace, $1.3M revenue in 72 hours 🍜 iMakan - multi location SaaS, 12 facilities Singapore, expanding Dubai 📈 GMX IO - autonomous AI trading platform, $350B total volume and 460k+ active traders 🏥 Carepatron alike Definia healthcare platform, 60 US facilities, HIPAA and SOC2 compliant What I build for clients: → AI agents and automation; n8n, Make, Claude API, OpenAI, voice agents, RAG pipelines → Full stack SaaS; React, Next.js, Node.js, PostgreSQL, Supabase → Blockchain and Web3; smart contracts, NFT marketplaces, tokenomics, DeFi, liquidity strategy, TGE → Product design; conversion funnels, landing pages, SaaS UI, mobile apps I work as a fractional CTO, lead developer, and product partner. Share your goal and deadline. I'll come back with the fastest honest path to results. Skills: Full-Stack Development, React, Next.js, Node.js, Python, PostgreSQL, Supabase, AI Integration, Claude Code, Claude Design, Anthropic APIs, OpenAI, n8n, Make, LangChain, RAG, Voice AI (Retell, Synthflow, Elevenlabs, WAPI), Blockchain, Smart Contracts, Solidity, NFT, Web3, Flutter, Mobile App Development, SaaS, API Integration, UI/UX Design, Figma

Most blockchain projects need 3 developers. I replace all of them. 3 years on Ethereum and Solana. $30M+ in liquidity managed. Zero security breaches. I work across the entire stack smart contracts, backend APIs, frontend interfaces, and AI agents so you get one developer who owns the whole product. What I've built: DeFi & AMM Protocols EOS-based AMM running live for 3 years with $30M+ in liquidity. Built the swap engine, pool mechanics, fee structure, and frontend end to end. DEX Aggregators Trade routing across multiple DEXs for best price execution. Routing algorithms, liquidity integrations, gas-optimized frontend. AI Agents On-chain agents for automated trading, portfolio rebalancing, and smart contract interaction. Crypto Wallets Offline signing, biometric auth, backend APIs, mobile and web UI. 100K+ transactions. Zero breaches. Real Estate Tokenization $10M+ in assets tokenized. Smart contracts, investor dashboards, KYC, compliance layer. Token Launchpads Vesting and staking contracts to frontend UI. $2M+ raised across projects. Cross-Chain Bridges Arbitrum, Optimism, and zk-Rollups. Crypto Payments Gas-optimized on-chain checkout. 2.5x improvement in client conversions. "Amir doesn't just write code he designs complete solutions. His ability to solve complex blockchain challenges saved us time and money, and the end product exceeded expectations."

I build AI powered web applications, AI Automations, LLM integrations and full stack products that work in production, not just in demos. Over the past 4 years, I have shipped projects for clients across the US, UK, Canada and Europe. I am 𝐓𝐨𝐩 𝐑𝐚𝐭𝐞𝐝 𝐨𝐧 𝐔𝐩𝐰𝐨𝐫𝐤 with a 100% Job Success Score, which reflects the same standard I bring to every project regardless of size. ⚙️𝐒𝐞𝐫𝐯𝐢𝐜𝐞𝐬 𝐈 𝐎𝐟𝐟𝐞𝐫⚙️: 🤖 𝐀𝐈 𝐃𝐞𝐯𝐞𝐥𝐨𝐩𝐦𝐞𝐧𝐭: I build real AI tools and automation systems, not just ChatGPT wrappers. AI automation workflows, multi agent systems, RAG pipelines, domain specific assistants and voice agents, all running in production using the latest LLM APIs. Some of the projects I have worked on include a voice AI fitness coaching application that accepts voice input via Web Speech API, generates personalised coaching responses using Claude and plays them back in natural speech via ElevenLabs with a Claude Vision layer that analyses food images and returns calorie counts in real time, an automated AI blog platform that scrapes fashion trend data and generates SEO optimised articles published automatically with no manual steps in between, a domain specific AI assistant grounded to business content that handles customer queries 24/7, an AI voice agent that answers inbound calls, qualifies each lead by asking about budget, timeline and intent automatically using Vapi, and an automated LinkedIn posting system that generates on brand posts with AI and publishes them on a set schedule with no manual effort. 🛠️ My Tech Stack For AI Development: Core Languages: Python, JavaScript (Node.js) LLMs: OpenAI, Anthropic Claude, Google Gemini, IBM WatsonX Voice AI: Vapi, ElevenLabs Automation & Integrations: Make, Manychat, n8n, Zapier Frameworks: LangChain, LangGraph, FastAPI Vision AI: GPT-4o Vision, Claude Vision Image Generation: Stability AI, DALL-E Vector and RAG: pgvector, Supabase Vector, RAG Pipelines Web Scraping: Playwright, Cheerio Other: Prompt Engineering, Structured Outputs, Agent Orchestration, Multi-Agent Systems 🖥️ 𝐅𝐮𝐥𝐥 𝐒𝐭𝐚𝐜𝐤 𝐃𝐞𝐯𝐞𝐥𝐨𝐩𝐦𝐞𝐧𝐭: I build complete web applications from concept to deployment, frontend and backend, so you are not juggling multiple developers for one product. Some of the products I have built include a multi tenant therapy SaaS with role based dashboards and Stripe subscriptions, a crypto investment platform with admin controls and dynamic content management, a community events platform, client dashboards and internal tools for businesses across multiple industries. 🛠️ My Tech Stack For Full Stack Development: Frontend: React, Next.js, Vite, TypeScript, Three.js, Tailwind CSS, Bootstrap, jQuery Backend: Node.js, Express.js, NestJS, Python, FastAPI, REST APIs, GraphQL, WebSockets Databases: MongoDB, PostgreSQL, Firebase BaaS: Supabase Authentication: JWT, OAuth, Supabase Auth, Firebase Auth Deployment: Vercel, Render, AWS, Oracle Cloud, DigitalOcean 🌟𝐖𝐡𝐲 𝐜𝐥𝐢𝐞𝐧𝐭𝐬 𝐤𝐞𝐞𝐩 𝐜𝐨𝐦𝐢𝐧𝐠 𝐛𝐚𝐜𝐤🌟 Every project gets the same level of attention regardless of size. You will always know where things stand, no chasing, no radio silence. And if something is not working I will tell you before you have to ask. Ready to build something? Send me a message.

Hi, My name is Rahul Mayekar, I am based out of Mumbai, India. I am a Mechanical engineer by education and Software engineer by experience. In software, I specialize in frontend development for websites and smart contract development for blockchain applications. Also because of my degree in mechanical engineering I also possess the skills in technical writing, technical documentation, technical analysis, product design, and I am also familiar with engineering based concepts and mathematics. So reach out to me if any your job requirements fall into these categories :)

Wanna see yourself on below list of clients I helped to earn few millions? Send me contract offer today! After working with me, clients usually get a feeling there is nothing I can’t do, and start throwing at me tasks requiring multiple skills I don’t have (which I pretty much always deliver) Indeed, “I can do all things through Christ which strengtheneth me.” (Philippians 4:13) but for most years I was programming, I was gaining experience with Javascript (React.js/Next.js/Node.js) and PHP (Symfony/Laravel/Wordpress) Last year I’m mostly working on Blockchain projects forking/fixing/auditing and integrating smart contracts into web applications frontend and backend. I was never smartest / most experienced / most educated guy around, so for 28 years I’ve spent programming (18 as primary income) I’ve been cultivating persistence, performance and love for challenges, which allows me to consistently deliver complex tasks, others are scared to even try or give up too soon. Of course, success is always an effort of entire team, but it wouldn't be too much of an exaggeration to say that, with God’s help I was the guy who made it possible - For Mobillogix to get MVP developed and shown to potential investors in about a month, get $4.5 million in a seed round (public data), and partner with companies like Samsung and AT&T (Fortune TOP20 at 2017) - For FindCashBuyersNow to get an unfair technological advantage, get US real estate market domination and receive gazillion (not authorised to disclose actual figures) USD for capital management - For Logan Paul to raise $3.5M (public data) after selling his Originals NFT collection - For Amnext to acquire above $0.5M market cap (public data) few days after the launching their DeFi - For BoomBoomNaturals to prepare their Shopify store to be ready for the date of being shown at Shark Tank episode ( youtu.be/K8cR6nn2_s4 ) and receive gazillion (not authorised to disclose actual figures) USD in sales Can’t list here all projects, but here is feedback I got from 2 of TOP100 Upwork clients (those who spent on Upwork more than $1M) after working with them for a few years: - #1 developer on Upwork. Having spent close to $200,000 with him on several projects, I am extremely happy and satisfied with his work... He is the kind of developer who takes on challenges and projects no one else can solve and with deadlines that are extremely difficult to achieve. He is worth every penny and more because he gets the job done every single time without any excuses or delays. Anyone who has the opportunity to work with Dmitry should consider themselves lucky as in all my years in Upwork, I haven't found someone as talented, patient and hard working as him as he never complains about how complex a job is, how tight the deadlines are or the fact that majority of the time he is solving the problems/bugs caused by other developers halfway towards the finish line of the project... - ... one of the best developers you can find, he is extremely smart, highly skilled and many web technologies, quick learner, friendly, business focused and result focused. I highly recommend Dmitry to anyone looking to hire someone that can get the job done If that wasn't enough, to save you from scrolling through hundreds of jobs, I've picked few more: - in 7 years of continuously using freelancer websites this experience stands out as being exemplary ... most professional manner possible. 6 stars - I am rarely impressed, but I was impressed! Senior Google/Facebook level of expertise truly unbelievable. - I don't know how Dmitry managers to do what he does, but he is far and above the most communicative, qualified and efficient developer I have worked with here - Wow how you do that so easily, GENIUS! - Dmitry truly is brilliant at programming. Many people say they are rockstar programmers but he truly is a rockstar - Truly a PHP ninja and a rock star developer - The fastest and more competent PHP developer I found on oDesk! He's really the "fastest gun in the west" - It is not a human! - This guy is a wizard - Dmitri is truly as talented of a developer as everything (including himself) says he is - I would pay a much higher hourly rate for his services. He is faster than any other contractor I've worked with here and he gets the job done correctly - This guy is awesome. Period

Hello, With over 10 years of hands-on experience in mobile app development, n8n, AI Automations, full-stack development, and cutting-edge technologies like AI, Machine Learning (ML), and Blockchain, I specialize in delivering custom mobile apps, crypto solutions, and AI-driven applications. 🔹 What I bring to the table: - 50+ Successful Projects Completed 🌟 - 30+ Thrilled Clients Worldwide 🌍 - 100,000+ Downloads & Users 📲 - Award-Winning Innovator in App Design 🏆 - Certified Advanced Mobile & Web Developer 🎓 💡 My expertise includes: - AI Mobile Apps (iOS/Android) 🤖 - Blockchain Development (Ethereum, Solana, etc.) 🪙 - Smart Contracts Development (Solidity, Ethereum) 📝 - Crypto Wallets & DApps Development 💼 - Custom Mobile App Development (Cross-platform, React Native) 📱 - Full-Stack Web Development (React, Node.js, Python, etc.) 💻 - Cloud Integration (AWS, Firebase, Google Cloud) ☁️ - UI/UX Design & Optimization 🎨 - DeFi & NFT Solutions 💎 - API Integration & Third-Party Services 🔗 🔧 Technologies I work with: - React Native, Swift, Kotlin, Java, Objective-C - Node.js, React.js, Next.js, Angular, Vue.js - Blockchain Frameworks: Solidity, Web3.js, Truffle - AI Tools & Libraries: TensorFlow, OpenAI, Keras - Crypto Platforms: Ethereum, Binance Smart Chain, Polkadot Let me help you to build a web and mobile application for you. Just tap "HIRE ME" or "SEND AN INVITE" and let's connect. Thanks & Regards, Himanshu.