🔧 I Build Scalable Web Apps, Intelligent Systems & Secure Blockchain Solutions — End to End. With 8+ years of experience, I help startups and enterprises turn ideas into production-ready tech. Clients hire me because I: ✅ Deliver fast without cutting corners (check my 5/5 Upwork streak) ✅ Explain tech in plain English—no jargon, just solutions ✅ Fix hidden problems (like that smart contract bug 3 other devs missed) 🛠 What I Bring to Your Project 1. Full-Stack Web Development Frontend: React, Next.js, Flutter (PWA/mobile-friendly) Backend: Node.js, Django, Microservices, REST/GraphQL APIs DB/DevOps: MongoDB, PostgreSQL, AWS, Docker, CI/CD 2. Blockchain (Bonus) Smart Contracts: Ethereum/Solana (Solidity, Rust) Web3 Apps: DeFi, NFTs, DAOs + MERN stack integration Private Chains: Hyperledger Fabric, IPFS 3. AI/ML (When You Actually Need It) Computer Vision: OpenCV, YOLO, ResNet (e.g. inventory tracking) LLMs: ChatGPT plugins, RAG pipelines, custom GPT wrappers MLOps: SageMaker, Azure ML for scalable model deployment 💬 Why Clients Keep Coming Back ✅ 100% on-time delivery on all Upwork projects (all 5-star rated) ✅ “Clean code first” mindset—your team can actually maintain my work ✅ AI/Blockchain pragmatism: I’ll tell you when it’s overkill 🚀 Recent Projects ✅ Blockchain Supply Chain Tracker: Hyperledger + React ✅ AI Document Reviewer: Node.js API + LLM for legal docs ✅ SaaS Platform at Scale: 50K users using AWS Lambda

Senior Web3 Blockchain & AI Engineer I build at the intersection of decentralized systems and artificial intelligence where smart contracts meet machine learning, and on-chain infrastructure powers intelligent, autonomous applications. With deep expertise across blockchain development and AI engineering, I deliver production-ready solutions that are secure, scalable, and designed for the real world. What I Build Blockchain & Web3 Solidity smart contracts, DeFi protocols, NFT marketplaces, DAOs, token launches, staking systems, DEX integrations (Uniswap / PancakeSwap), cross-chain bridges, Layer-2 solutions, crypto payment systems, and full-stack dApps across Ethereum, BNB Chain, Polygon, and Arbitrum. AI Engineering LLM-powered applications, RAG pipelines, AI agents and autonomous workflows, fine-tuned models, natural language interfaces for Web3, AI-integrated smart contract monitoring, on-chain data intelligence, and predictive analytics for DeFi. AI × Web3 Convergence AI-driven trading and arbitrage bots, intelligent contract auditing assistants, on-chain anomaly detection, LLM-powered DAO governance tools, AI agents interacting with blockchain protocols, and real-world asset (RWA) platforms with embedded intelligence. Core Expertise:- Blockchain Solidity · ERC-20 / ERC-721 / ERC-1155 · Hardhat · Foundry · Wagmi · Viem · Web3.js · Ethers.js · Gas Optimization · Smart Contract Security · Token Vesting · Tokenomics · Wallet Integration · On-Chain & Off-Chain Architecture AI & Machine Learning LLMs (GPT-4, Claude, Gemini, open-source) · LangChain · LlamaIndex · RAG Systems · Vector Databases (Pinecone, Weaviate, Chroma) · Fine-Tuning · AI Agents · OpenAI API · Hugging Face · Prompt Engineering · Embeddings · Semantic Search Full Stack & Infrastructure TypeScript · Node.js · React · Next.js · Python · Rust · MongoDB · PostgreSQL · Docker · AWS · Firebase · CI/CD Pipelines · Blockchain Deployment Pipelines What I've Shipped ✔ Decentralized Applications (dApps) with AI-powered user interfaces ✔ DeFi Platforms with intelligent yield optimization and risk scoring ✔ NFT Ecosystems with AI-generated content and rarity analysis ✔ DAO Governance Systems with LLM-assisted proposal drafting and summarization ✔ AI Trading & Arbitrage Bots with real-time on-chain signal processing ✔ Token Presale & Launchpad Platforms ✔ Crypto Wallet Applications with smart transaction suggestions ✔ Real World Asset (RWA) Platforms with AI document verification ✔ Web3 SaaS Platforms with embedded AI assistants ✔ Blockchain Dashboards with NLP querying and predictive analytics ✔ Liquidity & Farming Systems with automated rebalancing logic ✔ Smart Contract Auditing Tools augmented by AI analysis Why Clients Choose Me Security-first — every contract and AI pipeline is built with attack surfaces and edge cases in mind. Clean architecture — maintainable code, clear separation of concerns, well-documented systems. AI × Web3 natively — not bolted on, but designed together from the ground up. Fast communication — transparent, async-friendly, timezone-aware. Long-term partner— I support what I ship, from testnet to mainnet to production at scale. Business-oriented — I understand your product goals, not just the technical spec. Startup to enterprise — I've worked across the full spectrum and know what each stage needs. I build blockchain products and AI systems that are reliable, efficient, and ready for real-world adoption and increasingly, I build them as one unified thing Let's connect and talk about your next project

Most blockchain products don't fail because of a bad idea. They fail because of a missed security check, an inefficient contract, poor protocol design, or infrastructure that can't handle real users. Whether it's a DeFi protocol, DEX, staking platform, NFT ecosystem, or token launch, one small mistake can put funds, users, and your reputation at risk. Building secure, scalable blockchain products that perform under real-world conditions is what I focus on. I'm a blockchain developer with 6+ years of experience designing and building production-ready applications across Solana and EVM ecosystems. I work with startups, Web3 teams, and established companies to turn complex blockchain ideas into reliable products from smart contracts and protocol development to full-stack decentralized applications and backend infrastructure. Over the years, I've contributed to products that have supported millions of users, routed billions in transaction value, maintained high availability, and powered secure on-chain operations across multiple blockchain networks. Some of the blockchain products I've worked on : ** High-Performance Solana DeFi Infrastructure** – Built core infrastructure for a Solana ecosystem including a DEX aggregator, validator services, high-performance RPC, and developer SDKs. Worked extensively on transaction optimization, gasless user experiences, MEV-aware routing, and real-time blockchain data streaming to deliver fast and reliable DeFi infrastructure. **Blockchain Credential Platform** – Developed a platform that issues and verifies permanent digital certificates using compressed NFTs on Solana. The solution enables organizations to create tamper-proof credentials that remain publicly verifiable while significantly reducing on-chain storage costs. **Web3 Social & NFT Marketplace** – Helped build a decentralized social platform where users can mint content as NFTs, trade digital assets, earn royalties, and manage identities through wallet authentication. The platform included marketplace functionality, referral systems, KYC integration, and scalable backend services. My technical stack includes Rust, Anchor Framework, Solana Program Library (SPL), Token-2022, Metaplex, Solana Web3.js, Solidity, Ethereum, EVM-compatible chains, DeFi protocol development, DEX architecture, NFT infrastructure, smart contract development, Node.js, TypeScript, React, PostgreSQL, Docker, Kubernetes, AWS, GCP, REST APIs, GraphQL, WebSockets, CI/CD, and comprehensive testing across localnet, devnet, and mainnet environments. I believe successful blockchain development is about more than writing smart contracts. Every feature is designed with security, performance, maintainability, and long-term scalability in mind. I communicate progress clearly, document important decisions, and deliver thoroughly tested code that teams can confidently deploy to production. If you're building a DeFi protocol, decentralized exchange, staking platform, token ecosystem, NFT marketplace, Web3 application, or any blockchain product where security and reliability matter, I'd be happy to discuss your project. Even if you're still refining the idea, send me a message I'll provide an honest assessment, recommend the best technical approach, and let you know how I can help bring it to production.

A Full Stack AI Developer who builds production-ready, AI-powered web applications that hold up under real-world use. My work sits at the intersection of Full Stack Developer and AI Developer, pairing modern LLM features with clean React frontends and reliable Node.js & Python backends, so you get one engineer who can own a product end-to-end instead of splitting it across a separate React developer, backend developer, and AI specialist. As an AI Developer, I help founders and teams add intelligence to their products that actually works in production not throwaway demos. I build LLM-powered features, RAG chatbots, AI Automations using tools like N8N, Zapier, Make and Claude and AI agents using the OpenAI and Claude APIs, LangChain, and Custom GPT integrations, with a focus on systems that are reliable, observable, and cost-controlled. Recently I designed and shipped AI automation and Custom GPT workflows that streamlined real business operations, and I supervised the launch of a B2B SaaS AI platform through architecture and code review work my clients rated 5 stars. As a Full Stack Developer, I take ownership of the whole system. My frontend work is React and Next.js with TypeScript and Tailwind CSS; my backend work is Node.js, Express, NestJS and Python, exposing clean REST and GraphQL APIs. This end-to-end ownership is why clients bring me in as a Full Stack AI Developer rather than coordinating three roles. I keep the architecture coherent from database to UI, and I make sure AI features integrate cleanly into the product instead of sitting bolted on the side. A large part of my work involves turning an idea or a rough prototype into a stable, scalable platform: multi-role dashboards, admin panels, subscription and authentication systems, and the API layer that ties LLM and AI agent features into the product. I've built SaaS platforms serving thousands of users and shipped crypto wallets that handle real transactions, so I'm comfortable with the parts of a product where data integrity, security, and performance genuinely matter. 𝐖𝐡𝐞𝐫𝐞 𝐈 𝐚𝐝𝐝 𝐭𝐡𝐞 𝐦𝐨𝐬𝐭 𝐯𝐚𝐥𝐮𝐞: 𝐀𝐈 𝐟𝐞𝐚𝐭𝐮𝐫𝐞𝐬 𝐭𝐡𝐚𝐭 𝐰𝐨𝐫𝐤 𝐢𝐧 𝐩𝐫𝐨𝐝𝐮𝐜𝐭𝐢𝐨𝐧: LLM integrations, RAG chatbots, AI agents, Automation and Custom GPT / OpenAI / Claude API workflows built into real products 𝐒𝐚𝐚𝐒 𝐩𝐥𝐚𝐭𝐟𝐨𝐫𝐦𝐬 𝐟𝐫𝐨𝐦 𝐌𝐕𝐏 𝐭𝐨 𝐬𝐜𝐚𝐥𝐞: dashboards, multi-role access, subscriptions, and clean architecture designed to grow 𝐅𝐮𝐥𝐥-𝐬𝐭𝐚𝐜𝐤 𝐰𝐞𝐛 𝐚𝐩𝐩𝐥𝐢𝐜𝐚𝐭𝐢𝐨𝐧𝐬: React / Next.js frontends with Node.js & Python backends, REST & GraphQL APIs, and third-party integrations 𝐀𝐈-𝐝𝐫𝐢𝐯𝐞𝐧 𝐚𝐮𝐭𝐨𝐦𝐚𝐭𝐢𝐨𝐧: connecting LLMs, APIs, and business logic to remove manual work and speed up operations 𝐌𝐲 𝐜𝐨𝐫𝐞 𝐬𝐭𝐚𝐜𝐤: Frontend: React, Next.js, TypeScript, Tailwind CSS Backend: Node.js, Python, Express, NestJS, GraphQL, REST AI: OpenAI API, Claude API, LangChain, LLM, RAG, AI Agents, Custom GPT Database: Supabase, PostgreSQL, MongoDB, Redis, Firebase, Pinecone Also available for select Web3 / smart-contract work (Solidity, Ethers.js) where it adds real value. 𝐇𝐨𝐰 𝐈 𝐰𝐨𝐫𝐤: I think like a product owner, not just a coder. Before writing code, I align on the business outcome who the user is, what they pay for, and where the product needs to be in six months. Then I ship in clear weekly milestones, communicate proactively, and stay available for fast turnaround. The result is a 100% Job Success score and clients who come back for their next build. If you're building an AI-powered product, a SaaS platform, or a full-stack web app and want a Full Stack AI Developer who can own it end-to-end, click 𝐈𝐧𝐯𝐢𝐭𝐞 or 𝐌𝐞𝐬𝐬𝐚𝐠𝐞 and send me the details. I respond within 24 hours.

Most blockchain projects don't fail on the idea. They fail on an unchecked account, a missing signer validation, or math that overflows the first time real volume hits, and when there's a DEX, a treasury, or a live token on the line, that's not a bug, it's a loss. Making sure that never happens is the core of what I do. I'm a senior blockchain engineer focused on Solana and other blockchains, with production work across DeFi infrastructure, NFT platforms, and smart contracts. I've spent the last 6+ building systems that handle real value and hold up under real load - $5B+ Value Routed, 1M+ Users, 99% Uptime, 850M+ TVL. Some of the work I've been part of : • Carbium - full-stack Solana infrastructure: a DEX aggregator, high-performance RPC, and a validator. Rust-heavy work on gasless swaps (trade without holding SOL), MEV-aware routing, and Yellowstone gRPC full-block streaming (~22ms), exposed through clean SDKs in Rust, TypeScript, and Python. • CertDigital - a platform for issuing and verifying blockchain-secured credentials as compressed NFTs (cNFTs) on Solana: certificates and badges that stay verifiable for life. • SoSH - a Web3 social platform and NFT marketplace (Ethereum) where users mint their social posts as NFTs and earn ongoing royalties on every resale, with wallet integration, KYC, referral rewards, and marketplace search. The stack I live in: Rust, Anchor, the Solana Program Library (SPL), including Token-2022, Metaplex and compressed NFTs, @solana/web3.js, plus Solidity/EVM when a project needs it. Testing with Anchor tests, LiteSVM, and Bankrun across localnet, devnet, and mainnet. How I work: updates in plain language, not walls of jargon. I'll tell you a feature needs two more days before I'll hand you something I wouldn't trust with my own funds. Everything ships tested, and every audit I write can be understood by a non-technical founder and acted on by a dev. If you're building on Solana or other blockchains and real value is on the line, a DEX, a token, an NFT drop, a credential system, or you want a serious second opinion before you launch, send me a note. A rough description is plenty. I'll tell you honestly whether I'm the right fit and how I'd tackle it.

I'm a full-stack MERN developer building web and mobile applications with integrated AI capabilities. I work across the entire stack React/React Native frontends, Node.js/Express backends, and MongoDB data layer, delivering products that are fast, scalable, and production-ready. My recent focus has been on embedding AI into traditional applications: intelligent automation, ChatGPT/OpenAI integrations, and AI-assisted workflows that solve real business problems rather than just adding AI as a buzzword. What I've built: A fully decentralized prediction and gaming platform ranked top 7 globally, featuring AMM-based pricing, public/private pool creation, and a live gaming suite processing $25M+ in volume A crypto launchpad ranked top 10 globally that has raised $220M+ for projects worldwide, with tier-based allocations, vesting schedules, and community-driven token launches A ZK-based privacy protocol that raised $160M+ in presale, enabling selective on-chain data disclosure using zero-knowledge proofs A multi-chain AI crypto wallet with 50k+ active users, featuring cross-chain swaps, token management, and integrated AI assistance An AI-powered business automation platform that streamlines operations, customer interactions, and workflow management through intelligent AI agents bridging Web3 infrastructure with enterprise-grade automation A Web3 super app with 1M+ downloads, delivering a full DeFi and crypto ecosystem in a single mobile application What I deliver: Full-stack web apps (MERN: MongoDB, Express, React, Node.js) Cross-platform mobile apps (React Native) AI integration (OpenAI API, LangChain, custom automation agents) UI/UX design and implementation, from wireframe to polished product API development & third-party integrations I prioritize clear communication, realistic timelines, and clean documented code. Let's build something great. Message me to get started.

I am a 𝐅𝐮𝐥𝐥 𝐒𝐭𝐚𝐜𝐤 & 𝐁𝐥𝐨𝐜𝐤𝐜𝐡𝐚𝐢𝐧 Developer with over 7+ years of experience, focused on building scalable 𝐖𝐞𝐛𝟑, 𝐃𝐞𝐅𝐢 𝐚𝐧𝐝 𝐍𝐅𝐓-based applications and high-performance web platforms using Next.js, React.js, and Node.js. I specialize in end-to-end decentralized application development and have a strong ability to convert ideas into fully production-ready blockchain systems. 🔗 𝗕𝗹𝗼𝗰𝗸𝗰𝗵𝗮𝗶𝗻 𝗘𝘅𝗽𝗲𝗿𝘁𝗶𝘀𝗲 Smart contract development using Solidity & Rust Ethereum, Solana, Bitcoin, Hyperledger, Substrate ERC20, ERC721, ERC1155 token standards DeFi systems, staking, tokenomics, liquidity logic NFT minting platforms and marketplaces Secure contract design using OpenZeppelin standards 🌐 𝐅𝐮𝐥𝐥 𝐒𝐭𝐚𝐜𝐤 𝐃𝐞𝐯𝐞𝐥𝐨𝐩𝐦𝐞𝐧𝐭 Frontend: React.js, Next.js, Angular, Vue.js Backend: Node.js, Express.js, Laravel, Firebase APIs: RESTful APIs, Web3 integrations Databases: MongoDB, MySQL Wallet integrations: MetaMask, WalletConnect Deployment: Vercel, AWS, Docker ⚙️ 𝐖𝐞𝐛𝟑 𝐃𝐞𝐯𝐞𝐥𝐨𝐩𝐦𝐞𝐧𝐭 𝐒𝐤𝐢𝐥𝐥𝐬 DApp architecture design and implementation Smart contract deployment on testnet & mainnet Gas optimization and performance tuning Blockchain data integration with frontend systems Web3.js / Ethers.js integration Secure transaction handling and contract interactions 🧠 𝐃𝐞𝐯𝐞𝐥𝐨𝐩𝐦𝐞𝐧𝐭 𝐀𝐩𝐩𝐫𝐨𝐚𝐜𝐡 Requirement analysis before development starts Modular and scalable architecture design Security-first coding practices Clean, maintainable, and well-structured code Continuous testing and debugging Smooth deployment workflow to production environments 💡 𝐖𝐡𝐚𝐭 𝐈 𝐃𝐞𝐥𝐢𝐯𝐞𝐫 Fully functional decentralized applications Secure and optimized smart contracts Seamless Web3 + frontend integration Scalable backend systems built with Node.js and Next.js Production-ready DeFi, NFT, and full-stack web solutions 🤝 𝐖𝐨𝐫𝐤𝐢𝐧𝐠 𝐒𝐭𝐲𝐥𝐞 Independent and fast execution Clear communication throughout the project Focus on quality and long-term scalability Quick adaptation to project requirements Commitment to delivering reliable blockchain solutions Blockchain Developer, Web3 Developer, Smart Contract Developer, Solidity Developer, DApp Developer, DeFi Development, NFT Marketplace, Ethereum Developer, Solana Developer, Full Stack Developer, React.js, Node.js, Crypto Development, Tokenization, Decentralized Applications, Web3 Integration, Blockchain Architecture, Smart Contract Auditing, OpenZeppelin, Ethers.js, Web3.js, Next.js Developer, Next.js Full Stack, React.js Developer, Node.js Developer, Node.js Backend, Next.js Web App, React Frontend Developer, Full Stack Next.js, Server Side Rendering, Next.js API Routes, REST API Node.js #BlockchainDeveloper #Web3 #SmartContracts #Solidity #DApp #DeFi #NFT #Ethereum #Solana #CryptoDevelopment #FullStackDeveloper #NodeJS #ReactJS #Web3Integration #Tokenization #BlockchainTech #DecentralizedApps #Crypto #Fintech #SmartContractAudit #NextJS #NextjsDeveloper #ReactDeveloper #NodeJSDeveloper #FullStackNextJS #ServerSideRendering #ReactJS #BackendDeveloper

Web3 Developer | Smart Contracts | dApps | Crypto | Tokenomics | Bots I’m Donatas, a 𝗕𝗹𝗼𝗰𝗸𝗰𝗵𝗮𝗶𝗻 𝗱𝗲𝘃𝗲𝗹𝗼𝗽𝗲𝗿 with expertise in 𝗯𝗹𝗼𝗰𝗸𝗰𝗵𝗮𝗶𝗻 𝗱𝗲𝘃𝗲𝗹𝗼𝗽𝗺𝗲𝗻𝘁, 𝘀𝗺𝗮𝗿𝘁 𝗰𝗼𝗻𝘁𝗿𝗮𝗰𝘁𝘀, 𝗱𝗔𝗽𝗽𝘀, 𝘁𝗼𝗸𝗲𝗻𝗼𝗺𝗶𝗰𝘀, etc.. I help businesses and startups design, build, and scale their Web3 projects from idea to launch. 🔹 What I Do Best: ✅ ICO/IDO/IEO/IZO ✅ NFT as well as Crypto Minting ✅Exchange Development ✅Crypto Wallet Development ✅NFT Auction/Store/Minting/Marketplace/Design Development ✅Cross-chain Development ✅Pure Blockchain Development ✅Blockchain Gamification Development Apart from that. I am an also Expert at: | Android | iOS | Angular | MEAN Stack | Python | Laravel | Codeigniter | NodeJS | ExpressJS | MongoDB | React JS | Objective C | SWIFT | IONIC | Xamarin | React Native | WordPress | 🔹 Why Work With me? ✔ 𝗭𝗲𝗿𝗼 𝗥𝗶𝘀𝗸 𝗚𝘂𝗮𝗿𝗮𝗻𝘁𝗲𝗲 - If you don’t love working with me after 2 weeks, no matter how much work I’ve done, I’ll walk away - no payment required. ✔ 𝗙𝗿𝗲𝗲 𝗦𝘂𝗽𝗽𝗼𝗿𝘁 - We will provide support for 2 months post contract for any questions for free ✔ Already proven results with actual names. My latest work: 🟢 Litas – All-in-one Web3 ecosystem: multi-chain CEX, wallet, tokenomics, and full-stack product design. 🟢 BotanixLabs – BTC-reward wallet platform with EVM & Bitcoin auth, fair games, NFT gating, and auto payouts. 🟢 Zuvu – Decentralized AI governance with staker voting, upgradeable ERC-20, and modular architecture. 🟢 Mothership Bots – Launchpad bot suite: escrow, token launch, airdrops, and treasury control across EVM & Solana. Let’s build the future of blockchain together! Reach out, and let’s discuss your project.

Need a blockchain developer who's actually shipped production DeFi and tokenization systems, not just tutorials? I've deployed 15+ production smart contracts across Ethereum, Polygon, Arbitrum, and Base, with 99.9% uptime, 100% test coverage, and zero security incidents. My backend systems handle 500+ concurrent blockchain transactions through battle-tested message queuing and retry mechanisms. What I Build: Smart Contracts & DeFi - Staking systems with dynamic APR, vesting, and escrow - AMMs, orderbooks, and token distribution mechanisms - Real-world asset tokenization with fractional ownership and compliance layers - NFT ecosystems: marketplaces, minting factories, membership systems - Security-first: ReentrancyGuard, AccessControl, emergency withdrawals, audit-ready code Web3 Backend (Node.js / NestJS / TypeScript) - Blockchain integration layers: event listeners, transaction monitoring, multi-chain payment handlers - RESTful APIs with JWT auth, role-based access, rate limiting (50+ endpoint systems) - PostgreSQL/MongoDB with optimized schemas for on-chain + off-chain data - RabbitMQ async processing for reliable blockchain transaction pipelines - Real-time: WebSocket for live price feeds, leaderboards, notifications Recent Production Systems: - Web3 gaming platform: token, staking, tournaments, 500+ concurrent tx via RabbitMQ - Real-world asset tokenization: fractionalizer, orderbook, jurisdiction-based compliance - Crypto exchange backend: 150+ trading pairs, 10K+ requests/min, real-time price feeds - DeFi time-exchange protocol: escrow, dual-signature verification, liquidity pool integration Chains: Ethereum, Polygon, Arbitrum, Base, BSC Tools: Solidity, Hardhat, Foundry, Ethers.js, Viem, OpenZeppelin, IPFS 100% Job Success Score across completed contracts. Let's discuss your project, message me or book a consultation.

Hi, I’m Vivek Narula —I help businesses build and scale eCommerce stores, custom web applications, and business platforms using Shopify, Laravel, WordPress, and PHP. With 14+ years of experience, I've worked with clients worldwide to deliver solutions ranging from Shopify and WooCommerce stores to custom Laravel applications, APIs, SaaS platforms, and blockchain products. Expertise: ✔ Shopify Development & Customization ✔ Laravel & Custom PHP Applications ✔ WordPress & WooCommerce Development ✔ REST APIs & Third-Party Integrations ✔ SaaS Platforms & Admin Dashboards ✔ CRM, ERP & Business Automation Systems What you can expect: ✔ Clean, scalable, production-ready code ✔ Clear communication and reliable delivery ✔ Long-term technical support and ownership ✔ A focus on business goals, not just development tasks If you're looking for a developer who can take ownership of projects from planning to deployment, I'd be happy to discuss your requirements.