An adaptable software engineer with exposure and interests in varying domains. Can - Craft software using languages like Elixir, Rust, Python, Javascript. - Deploy things, especially to linux servers.

With 7+ years of experience building production-ready AI and ML systems, I work at the intersection of machine learning, large language models, full-stack engineering — and increasingly, AI-powered business automation on GoHighLevel. Founders and agencies come to me when the experimentation phase is over and they need something that actually works. 🔹 WHAT I BUILD LLM Applications Custom AI systems built with OpenAI, Claude, and LLaMA — engineered around your business logic, not generic templates. RAG Systems Chat with your own data: PDFs, Notion, Google Drive, databases — accurate retrieval, grounded and reliable responses. AI Agents & Chatbots Autonomous agents and intelligent chatbots connected to your tools, APIs, and CRMs via LangChain and custom pipelines. GoHighLevel AI Automation Full GHL builds with AI-enhanced workflows — smart lead follow-up bots, LLM-powered email sequences, AI chatbots embedded in GHL funnels, CRM tagging logic, and Zapier/Make integrations that connect your AI stack to your sales pipeline. ML Pipelines & Full-Stack AI Products End-to-end ML pipelines and deployable products — backend APIs + clean frontends. Not scripts. Not prototypes. Production systems. 🛠️ TECH STACK AI/ML: Python · LangChain · OpenAI · Claude · LLaMA · Hugging Face RAG & Vector DBs: Pinecone · Weaviate · FAISS · ChromaDB CRM & Automation: GoHighLevel · Zapier · Make (Integromat) · Webhooks Backend: FastAPI · Node.js · REST APIs Frontend: React · Next.js Databases: PostgreSQL · MongoDB

Computer Scientist and Mathematician. I use Rust, Go, Python and Typescript. Research and R&D. Feel free to reach out if you need help with any of these points of interest.

Launching a blockchain product is more than deploying a smart contract. Whether you're creating a token, building a wallet, launching an NFT collection, or developing a Web3 platform, every component needs to be secure, scalable, and designed for long-term growth. Poor contract architecture, weak wallet integration, or overlooked security risks can lead to costly issues after launch. Building blockchain products that users can trust is what I do. I'm a senior blockchain and crypto developer with 9+ years of experience delivering production-ready solutions across Solana, Ethereum, BNB Chain, Polygon, Base, and other EVM ecosystems. I help startups, founders, and businesses transform blockchain ideas into secure, user-friendly products from smart contracts and token launches to NFT platforms, wallets, and complete decentralized applications. Over the years, I've contributed to blockchain platforms serving millions of users, processing high-value on-chain transactions, and supporting scalable Web3 ecosystems with security and reliability at their core. Some of the blockchain products I've worked on : Token Launch & Ecosystem Development – Built fungible tokens with advanced tokenomics, vesting mechanisms, staking, governance, liquidity integration, and treasury management, ensuring secure and efficient token launches across multiple blockchain networks. NFT Marketplace & Digital Assets Platform – Developed NFT minting platforms, marketplaces, royalty systems, metadata management, and compressed NFT solutions, enabling creators and businesses to launch scalable digital asset ecosystems. Multi-Chain Wallet & Web3 Applications – Engineered secure wallet integrations supporting transaction signing, token transfers, NFT management, staking, and seamless interaction with decentralized applications while delivering intuitive user experiences. My technical stack includes Rust, Solidity, Anchor Framework, Solana Program Library (SPL), Token-2022, Metaplex, Ethereum, Solana, Polygon, Base, BNB Chain, Ethers.js, Solana Web3.js, Web3.py, Node.js, TypeScript, React, Next.js, PostgreSQL, MongoDB, Docker, Kubernetes, AWS, GCP, REST APIs, GraphQL, CI/CD, and comprehensive testing across development and production environments. I believe great blockchain products combine strong engineering with clear communication. Every feature is built with security, maintainability, and performance in mind, backed by thorough testing and clean documentation. I keep clients informed throughout development, explain technical decisions in straightforward language, and deliver solutions that are ready for production not just demos. If you're planning a token launch, NFT platform, crypto wallet, Web3 application, DAO, staking platform, or any blockchain-based product, I'd be happy to discuss your vision. Share your idea or existing project, and I'll provide an honest assessment, recommend the right technical approach, and help you build a secure, scalable solution that lasts.

🚀AVAILABLE TO START TODAY!⚡100% Job Success • 💰 $100K+ Earned • ⭐ 40+ Successful Projects • ⏱️ 5,400+ Hours Worked I'm a Senior Full-Stack Developer specializing in React, Next.js, Node.js, TypeScript, React Native, AI applications, and SaaS product development. For the past 8+ years, I've helped startups and businesses launch MVPs, scale SaaS platforms, build AI-powered products, and modernize existing applications. I don't just build features. I help clients build products that are reliable, scalable, and ready for real users. What I Can Help You Build ✅ AI SaaS Applications powered by OpenAI, Claude, LangChain, RAG, and AI Agents ✅ Production-ready MVPs using React, Next.js, Node.js, TypeScript, and Supabase ✅ React Native mobile applications for iOS and Android with Expo ✅ Modern web applications, dashboards, admin panels, CRMs, marketplaces, and business platforms ✅ Secure backend systems with authentication, APIs, payments, and scalable database architecture ✅ Stripe subscriptions, payment gateways, third-party API integrations, and automation workflows ✅ Cloud deployment, Docker, AWS, Vercel, CI/CD, and production optimization Projects I've Delivered • AI-powered SaaS platforms • Startup MVPs • Healthcare applications • FinTech products • Marketplace platforms • CRM & ERP systems • Booking platforms • Internal business tools • Multi-tenant SaaS applications • Mobile applications for iOS & Android Tech Stack - Frontend - React, Next.js, TypeScript, JavaScript, Tailwind CSS - Backend - Node.js, Express.js, Python, Supabase, REST APIs - Mobile - React Native, Expo, iOS, Android - AI - OpenAI, Claude, LangChai, RAG, AI Agents, n8n - Databases - PostgreSQL, MongoDB, Firebase, Supabase - Cloud - AWS, Docker, Vercel, DigitalOcean - Integrations - Stripe, Twilio, Google Maps, Firebase Auth, Vapi, ElevenLabs Why Clients Work With Me ✔ Product-first approach instead of just writing code ✔ Clear communication and reliable delivery ✔ Clean, maintainable, scalable architecture ✔ Experience building products from MVP to production ✔ Fast problem-solving and production issue resolution ✔ Long-term engineering partner for startups and growing businesses Whether you're building an AI product, SaaS platform, React Native app, or scaling an existing application, I can help you move from idea to production with clean code, thoughtful architecture, and reliable execution. Send me a message, and Let's discuss how I can contribute to your project.

Building a blockchain product is easy. Building one that remains secure, scalable, and profitable in production is where experience matters. I help startups and enterprises build DeFi platforms, Solana trading bots, smart contracts, and Web3 applications that are designed for real users, not just demos. Over the last 10+ years, I have helped startups, enterprises, and Web3 founders design and launch secure blockchain applications, DeFi ecosystems, trading bots, NFT platforms, and tokenization solutions. With $200K+ earned on Upwork and 50+ successful projects delivered, I focus on building systems that are scalable, secure, and and commercially viable. 𝗪𝗵𝗮𝘁 𝗜 𝗖𝗮𝗻 𝗛𝗲𝗹𝗽 𝗬𝗼𝘂 𝗕𝘂𝗶𝗹𝗱: ✔ DeFi Platforms (Staking, Yield Farming, Liquidity Mining) ✔ Solana Trading Bots (Jupiter, Raydium, Arbitrage, Sniper Bots) ✔ Smart Contracts (Solidity & Rust) ✔ NFT Marketplaces & Minting Platforms ✔ Crypto Exchanges & Wallet Solutions ✔ Prediction Market Platforms ✔ Token Launchpads (EVM & Solana) ✔ Real World Asset (RWA) Tokenization Platforms ✔ DAO & Governance Systems ✔ AI-Powered Blockchain Applications ✔ Cross-Chain dApps & Blockchain Integrations 𝗕𝗹𝗼𝗰𝗸𝗰𝗵𝗮𝗶𝗻 𝗘𝗰𝗼𝘀𝘆𝘀𝘁𝗲𝗺𝘀: • Ethereum • Solana • Polygon • Binance Smart Chain • Avalanche • Arbitrum • Optimism • Cosmos • Hyperledger 𝗔𝗿𝗰𝗵𝗶𝘁𝗲𝗰𝘁𝘂𝗿𝗲 & 𝗘𝗻𝗴𝗶𝗻𝗲𝗲𝗿𝗶𝗻𝗴 𝗘𝘅𝗽𝗲𝗿𝘁𝗶𝘀𝗲: • Smart Contract Development & Security • Tokenomics Design • Blockchain Infrastructure • WebSocket & Real-Time Systems • Microservices Architecture • Trading Engine Development • API Integrations • Cloud Deployment & Scalability • Performance Optimization • Security Auditing & Best Practices 𝗥𝗲𝗰𝗲𝗻𝘁 𝗣𝗿𝗼𝗷𝗲𝗰𝘁 𝗛𝗶𝗴𝗵𝗹𝗶𝗴𝗵𝘁𝘀 • Developed a Polygon-based prediction market platform with smart contract-powered settlements. • Built Solana trading bots integrated with Jupiter and Raydium for automated trade execution. • Delivered NFT marketplace infrastructure including ERC-721 and ERC-1155 smart contracts. • Created DeFi staking and liquidity protocols with automated rewards distribution. • Designed token launchpad solutions supporting both EVM and Solana ecosystems. 𝗧𝗲𝗰𝗵𝗻𝗼𝗹𝗼𝗴𝗶𝗲𝘀: Solidity | Rust | Web3.js | Ethers.js | Node.js | React.js | Next.js | TypeScript | GraphQL | PostgreSQL | MongoDB | AWS | Docker 𝗪𝗵𝘆 𝗖𝗹𝗶𝗲𝗻𝘁𝘀 𝗛𝗶𝗿𝗲 𝗠𝗲: ✔ Architecture-First Approach ✔ Security-Focused Development ✔ Clear & Transparent Communication ✔ Reliable Delivery & Long-Term Support ✔ Startup & Enterprise Experience A successful blockchain project depends on architecture, security, and scalability, not just smart contracts. If you're building a Web3 product, let's discuss your vision and create a technical roadmap before writing a single line of code.

✅ TOP RATED PLUS (Top 3% Freelancer) Developer on Upwork, specializing in Mobile (Android native/Flutter). A pioneering and security-oriented developer offering more than 14 years of experience designing, implementing, integrating, testing and supporting impactful applications developed in diverse, collaborative environments for mobile and tablet devices on the mobile platform. WHY CHOOSE ME? ✅ 14+ Years of experience in Mobile Development ✅ 50 Finished Projects on Upwork, 100% Job Success ✅ 99% Clients who would recommend ⚡️ROCKSTAR IN: — Native Android/IOS Development — Hybrid Mobile Development - Flutter/React Native — Rust/NodeJS Backend Development ✅ Career Highlights - Developed numerous intuitive, visually engaging, and high-performance mobile applications that prioritize user experience and functionality. - Recognized for writing clean, efficient, secure, and reusable code, with a strong focus on privacy and data security. - Skilled in object-oriented design, data structures, problem-solving, performance optimization, and advanced debugging techniques. - Deep expertise in handling device compatibility and cross-version behavior across the mobile ecosystem. - Known as a self-driven, organized, and reliable developer who consistently meets deadlines and delivers quality work. - Provided technical leadership and mentorship to junior developers, helping elevate team performance. - Active contributor to the developer community with over 8,200 reputation points on Stack Overflow. 💬REVIEWS FROM CLIENTS: ⭐⭐⭐⭐⭐ "Phuoc Doan Hong is a true expert. His Kotlin knowledge and Android development experience are really valuable. I highly recommend this guy." ⭐⭐⭐⭐⭐ "He was an expert, in every move he made. Knowledgeable, patient and easy to communicate with. You can blindly trust him. Thanks again" ⭐⭐⭐⭐⭐ "Doan is highly skilled, smart, and works hard to find the best solution for complex problems. He has deep understanding of performance considerations in the Android platform. An Android expert. His English is excellent, and communication is great." ⭐⭐⭐⭐⭐ "I can simply say that I am very happy to work with him. He is very responsible, hardworking, and talented developer with great communication skills. He understood all the problems and delivered clear solutions. His skills and his professionalism are very high level. I am sure we will be working on new projects with him. Thanks for this amazing work!" Below you will find client reviews section, it describes the quality of work and value that you can expect from working with me

Your blockchain project will generate $500K+ revenue through secure, scalable Web3 solutions that outperform 90% of competitors. I transform complex blockchain ideas into profitable, battle-tested applications with verified smart contracts and measurable business impact. 𝗥𝗲𝗰𝗲𝗻𝘁 𝗖𝗹𝗶𝗲𝗻𝘁 𝗥𝗲𝘀𝘂𝗹𝘁𝘀: -Deployed DeFi protocol managing $2.3M TVL with zero security breaches over 18 months -Built an NFT marketplace processing $800K+ in transactions within the first 6 months -Optimized smart contracts, reducing gas fees by 42% for 50K+ users -Created a cross-chain bridge handling 15K+ transactions monthly with 99.97% uptime 𝗖𝗼𝗿𝗲 𝗘𝘅𝗽𝗲𝗿𝘁𝗶𝘀𝗲: 𝗦𝗺𝗮𝗿𝘁 𝗖𝗼𝗻𝘁𝗿𝗮𝗰𝘁𝘀 & 𝗦𝗲𝗰𝘂𝗿𝗶𝘁𝘆: Ethereum, Polygon, BNB Chain, Solana using Solidity and Rust. Expert in gas optimization, security auditing, and vulnerability prevention with 200+ deployed contracts. 𝗗𝗲𝗙𝗶 𝗗𝗲𝘃𝗲𝗹𝗼𝗽𝗺𝗲𝗻𝘁: Staking protocols, lending platforms, liquidity pools, and automated market makers (AMMs). Specialized in tokenomics design and yield farming mechanisms. 𝗡𝗙𝗧 & 𝗧𝗼𝗸𝗲𝗻 𝗦𝗼𝗹𝘂𝘁𝗶𝗼𝗻𝘀: ERC-20, ERC-721, ERC-1155 implementations, NFT marketplaces, and custom tokenomics. Experience with 40+ successful token launches. 𝗱𝗔𝗽𝗽 𝗔𝗿𝗰𝗵𝗶𝘁𝗲𝗰𝘁𝘂𝗿𝗲: React/Next.js frontends with Web3.js/Ethers.js integration, MetaMask and WalletConnect implementations, and responsive Web3 user experiences. We deliver full-cycle, end-to-end blockchain development solutions, spanning DeFi protocols, NFT marketplaces, RWA tokenization, Layer-2 integrations, and advanced Web3 dApp development. Our expertise includes custom smart contract development, enterprise-grade blockchain infrastructure, and seamless integration with modern Web3 ecosystems. We architect secure, scalable, and high-performance decentralized systems designed for real-world adoption and long-term impact. Our approach emphasizes smart contract audits, zero-trust security architecture, gas optimization, MEV-resistant design, cross-chain interoperability, and on-chain governance models. By implementing rigorous security standards, protocol-level safeguards, and performance optimization strategies, we build blockchain products that meet evolving industry standards and ensure sustainable scalability. If you are ready to turn your Web3 vision into a production-ready solution, we can support your tokenomics design, DAO framework development, blockchain infrastructure planning, and scalable Web3 roadmap execution, delivering resilient, future-proof decentralized ecosystems aligned with next-generation blockchain innovation.

Most blockchain projects don't fail because of bad smart contracts, they fail because the frontend can't communicate with the chain reliably, the wallet integration breaks under real users, or the on-chain architecture wasn't designed for the product from day one. I build full stack blockchain applications where the smart contract logic, Web3 frontend, and backend infrastructure are designed together not bolted together after the fact. What I've shipped: ERC-20/721 smart contracts, DeFi protocols, and NFT marketplaces handling real transaction volume on Solana and EVM chains Full stack Web3 platforms with wallet integrations, token economies, and cross-chain DApp architecture Blockchain-integrated game systems, on-chain asset ownership, NFT-based progression, and token reward mechanics React and Next.js frontends for fintech and Web3 products with complex data flows and real-time performance AI-connected blockchain tools, on-chain automation agents and LLM-connected workflows where relevant Where I'm strongest: Solidity and EVM smart contracts built for security and auditability, not just functionality React and Next.js frontend and backend for Web3 UIs that handle real users DeFi protocol integrations and NFT platform builds Blockchain game development, on-chain mechanics, asset systems, and token economies How I work: I ask why before I write code. Every architecture decision, chain selection, contract structure, wallet integration approach gets validated against your product requirements before development starts. I've worked with startups, gaming studios, and DeFi teams. I don't just build features, I help you think through the architecture first. Tech Stack: Solidity | EVM | Solana | Web3.js | Ethers.js | IPFS React | Next.js | Node.js | MongoDB | REST APIs MetaMask | WalletConnect | NFT Standards | DeFi Protocols OpenAI API | AI Agents | LLM Workflows GitHub Actions | Performance Optimization If you need a blockchain developer who understands the full stack from smart contract to user interface, let's talk. Regards Vinod Last Updated on June 05, 2026

I help startups, founders, and businesses to build production-ready Blockchain, Web3, and AI-powered solutions that are secure, scalable, and built for real-world use. As a Blockchain Developer and AI Agent Developer, I specialize in Smart Contract Development, Solana Development, Ethereum Development, Web3 Infrastructure, Autonomous AI Agents, and On-Chain Payment Systems. My focus is on building high-performance decentralized applications, blockchain ecosystems, and AI-driven automation that deliver measurable results. 𝗖𝗼𝗿𝗲 𝗘𝘅𝗽𝗲𝗿𝘁𝗶𝘀𝗲: Blockchain Development, Web3 Development, Smart Contract Development, Solidity Development, Rust Development, Solana Development, Ethereum Development, DApp Development, AI Agent Development, Agentic AI Systems, Autonomous AI Agents, Web3 Infrastructure, Layer-1 Blockchain Development, DeFi Development, NFT Marketplace Development, Cryptocurrency Payment Systems, On-Chain Payment Infrastructure, x402 Payment Protocol, Staking Platforms, Validator Nodes, Consensus Mechanisms, Hyperledger Development, IPFS Integration, Web3 Automation, Decentralized Identity Solutions, Certificate Verification Systems 𝗧𝗲𝗰𝗵𝗻𝗶𝗰𝗮𝗹 𝗦𝘁𝗮𝗰𝗸: Solidity, Rust, Python, JavaScript, TypeScript, React.js, Next.js, Node.js, Web3.js, Ethers.js, Hyperledger, IPFS, MongoDB, PostgreSQL, AI/ML Frameworks, LLM Integration, Agentic AI Frameworks, API Development, Cloud Infrastructure, Blockchain Architecture, and Web3 Technologies. 𝗣𝗿𝗼𝗷𝗲𝗰𝘁𝘀 𝗜'𝘃𝗲 𝗕𝘂𝗶𝗹𝘁: ✅ Smart Contracts for Ethereum and EVM Chains ✅ Solana-Based Blockchain Applications ✅ NFT Marketplaces with Minting, Trading, and Marketplace Features ✅ DeFi Protocols and Staking Platforms ✅ Layer-1 Blockchain Ecosystems with Validator Networks ✅ Decentralized Verification and Credential Systems ✅ AI-Powered Autonomous Agents ✅ On-Chain Payment Infrastructure and Web3 Payment Systems ✅ Enterprise Blockchain Solutions using Hyperledger ✅ Web3 Automation and Blockchain Integrations Whether you're building a Blockchain Startup, Web3 Platform, DeFi Protocol, NFT Marketplace, AI Agent, Smart Contract System, or Cryptocurrency Payment Solution, I can transform your idea into a secure, scalable, and production-ready product. Let's build the future of Blockchain, Web3, Smart Contracts, AI Agents, DeFi, NFTs, and Decentralized Infrastructure.