Web3 Full Stack Developer with 4+ years of blockchain experience and 2+ years in professional roles. I specialize in smart contracts, DeFi systems, NFT bridges, and cross-chain tools like LayerZero and ERC-4337. From solar-powered validator networks to tokenized RWA lending, I deliver scalable and secure Web3 solutions. Skilled in Solidity, Rust, and modern frontend frameworks like React and Next.js.

I'm a freelance Blockchain specialist with over 9 years of experience delivering high-quality decentralized applications, smart contract systems, and Web3 infrastructure. I've worked with a wide variety of clients. From DAOs and startups to established tech companies building: 🧠 Smart contracts (Solana, Solidity, Hardhat,...) 🧮 DeFi platforms (staking, liquidity mining, fee management, Native DEX,...) 🖼️ NFT marketplaces (minting, royalties, IPFS/Pinata, metadata management) 🌉 Cross-chain tools and integrations (Safe, Aave, Uniswap, Metamask, THORChain, CosmosSDK, IOTA,...) 🧰 Custom tooling and dApp frontends (React, Node.js, TypeScript, Ethers.js, Wagmi, Go,...) I'm also experienced in project leadership and backend systems, which helps me collaborate with full-stack teams, manage timelines, and deliver reliable software even under tight deadlines. ✅ Strong communication ✅ Web3-native mindset ✅ Adaptable to remote teams and async workflows If you’re looking for a committed and hands-on blockchain expert to bring your Web3 product to life, or scale it. Let’s connect.

\Web3 Developer | Blockchain Developer | Solidity & Rust Expert Looking for a reliable Web3 Developer who can turn your blockchain idea into a secure, scalable, and production-ready product? I specialize in blockchain development, smart contracts, decentralized applications (DApps), DeFi protocols, NFT platforms, token development, and Web3 integrations. Whether you're building on Ethereum, Solana, BNB Chain, Polygon, Base, Arbitrum, or other EVM-compatible networks, I can help you deliver a high-quality solution from concept to deployment. My focus is not just writing code it's building secure, gas-efficient, and scalable blockchain products that create real business value. Core Blockchain Services: • Smart Contract Development (Solidity & Rust) • Ethereum & EVM-Based Development • Solana Program Development (Anchor Framework) • DeFi Applications & Protocols • DEX, Staking & Yield Farming Platforms • NFT Marketplaces & NFT Smart Contracts • ERC20, BEP20 & SPL Token Development • Token Presale, ICO, IDO & Launchpads • DAO Development & Governance Systems • Crypto Wallet Integration • Cross-Chain & Web3 Integrations • Smart Contract Testing & Deployment • Smart Contract Optimization • Security Best Practices & Code Review • Blockchain Consulting & Architecture Design Technologies & Tools: • Solidity, Rust, JavaScript, TypeScript • Hardhat, Foundry, Anchor, Ethers.js, Web3.js • React.js, Next.js, Node.js • OpenZeppelin, Chainlink • IPFS, MongoDB, PostgreSQL • Ethereum, Solana, Polygon, BNB Chain, Base, Arbitrum Why work with me? • Clean, maintainable, production-ready code • Security-first development approach • Gas-optimized smart contracts • Clear communication and fast response time • End-to-end development support • Long-term partnership mindset Whether you need a custom smart contract, DeFi platform, NFT marketplace, token launch, Web3 integration, or a complete blockchain application, I'm ready to help bring your vision to life. Send me a message and let's discuss your project.

Hi! This is Marco Maigua with 9 years of experience in the Software Architect and development and I earned Masters degree in Computer Science at the University of Saskatchewan. I have launched successful products in web and mobile technologies, blockchain, Crypto, Cloud Computing while I engaged in various types of clients' projects from MVP to production. With the antifragile mindset, I have adopted and remained resilient, fostering a high-performance culture, blending technical and strategic expertise and applying best practices and optimization techniques. While working as a full-stack engineer, I put exceptional attention to detail into the projects and launched more than 10 MVPs, POCs into success, fixing the bugs thus ensured smooth production. I am ready to jump into your projects and discuss the details further!!

🚀 Professional Blockchain & AI Developer (Since 2013) 12+ years building high-performance, secure, and scalable Web3 ecosystems I’m a senior blockchain architect with a deep engineering background, specializing in designing and delivering next-generation decentralized applications. My work blends advanced blockchain engineering, AI-driven automation, and GameFi innovation to help clients launch powerful, future-proof products. 🔥 Core Expertise 🧠 Blockchain Engineering & Smart Contracts Expert in Solidity, Vyper, Rust, MOVE, and secure smart contract architecture Deep knowledge of Ethereum, BSC, Polygon, Solana, Sui, Avalanche, Arbitrum, Base & Hyperledger High-focus on security, gas optimization, scalable architecture, and clean code standards 🎮 GameFi & Metaverse Development Tokenized in-game economies & reward systems Play-to-Earn mechanics, NFT integrations, upgradeable assets On-chain/off-chain hybrid logic for large-scale games WebGL/Unity integrations with Web3 🤖 AI + Web3 Integrations AI-powered trading bots, market analyzers & automated strategies Smart contract auditing enhanced with AI detection AI-generated metadata for NFT collections Intelligent Web3 APIs & assistants LLM-integrated DApps for next-gen UX 💼 Proven Track Record Delivered production-ready solutions including: DeFi Platforms Staking, farming, lending/borrowing, AMMs, yield optimizers Liquidity mining, vault strategies, custom tokenomics NFT & Digital Asset Systems NFT marketplaces, launchpads, minting dApps ERC-721 / ERC-1155 / SPL /RUST / MOVE Dynamic, upgradeable, and on-chain metadata systems Token & Protocol Engineering ERC-20, governance tokens, vesting, distribution models Cross-chain tokens & interoperability solutions Layer-2 and rollup-based scaling integrations Secure Wallet & Web3 Infrastructure Wallet integrations (MetaMask, WalletConnect, Phantom, Suit etc.) Cross-chain bridges High-performance backend services for dApps 🌐 Open-Source & Ecosystem Contribution Contributor to multiple open-source Web3 libraries, smart contract tools, and decentralized infrastructure projects. 💡 Passionate About Innovation I love building secure, scalable, and user-friendly decentralized ecosystems—from complex DeFi protocols to immersive GameFi worlds and AI-enhanced Web3 platforms.

With over 5 years of experience in the international startup ecosystem, I specialize in building robust, scalable products from the ground up. I am a language and framework agnostic engineer who prioritizes using the right tool for the job without ever compromising on technical integrity. I began my career in 2019 translating high-level AI research papers into functional products. Since then, I have architected facial recognition systems, image processing pipelines, and LLM-based regulatory software for fintech startups across Europe and Asia. Since the early 2020s, I have been a core contributor to the DeFi space. I started out designing yield farming algorithms and loan regulatory software for Nord Finance. I joined BankX in late 2021 as the lead developer back when it was still just a white paper and a set of technical requirements. I built the entire protocol ecosystem from scratch and successfully navigated multiple audits from audit firms like CoinFabrik and Immunefi. The protocol is currently live on 8 different chains including PulseChain. In August 2024, I co-founded CtrlBit- A SaaS infrastructure platform for Mikrotik network management. The platform is live and handles centralized monitoring, zero-touch provisioning and secure remote access for global ISPs and enterprises at a fraction of the price. I don't just write code; I build sustainable businesses. I am financially literate, MTCNA certified and experienced in bridging the gap between complex engineering and market-ready solutions. I am currently on the lookout for innovative projects that require high-level technical leadership. Message me for a consultation. I am generally available during PST and UTC business hours.

- 𝟕+ 𝐲𝐞𝐚𝐫𝐬 of Web3 development experience - 𝟏𝟓𝟎+ 𝐩𝐫𝐨𝐣𝐞𝐜𝐭𝐬 completed including 20+ major builds - Delivered $𝟐𝟓𝐌+ worth of blockchain solutions across multiple networks 𝐖𝐡𝐚𝐭 𝐈 𝐃𝐨 𝟏. 𝐒𝐦𝐚𝐫𝐭 𝐂𝐨𝐧𝐭𝐫𝐚𝐜𝐭𝐬 Develop secure contracts for ERC-20, ERC-721, and ERC-1155 Create contracts for presales, launchpads, vesting, and airdrops Customize contracts for specific project needs 𝟐. 𝐂𝐫𝐲𝐩𝐭𝐨 𝐖𝐚𝐥𝐥𝐞𝐭𝐬 Build multi-chain wallets (custodial & non-custodial) Add features like transaction history and secure key storage Design simple and user-friendly wallet interfaces 𝟑. 𝐌𝐨𝐛𝐢𝐥𝐞 𝐀𝐩𝐩𝐬 Build cross-platform apps using React Native Connect apps with blockchain for smooth dApp interactions 𝟒. 𝐃𝐞𝐜𝐞𝐧𝐭𝐫𝐚𝐥𝐢𝐳𝐞𝐝 𝐄𝐱𝐜𝐡𝐚𝐧𝐠𝐞𝐬 (𝐃𝐄𝐗𝐬) Create platforms for token swaps and liquidity pools Add order-matching and advanced trading features 𝟓. 𝐍𝐅𝐓 𝐏𝐫𝐨𝐣𝐞𝐜𝐭𝐬 Launch generative NFT collections with dynamic metadata Build NFT marketplaces, staking, and breeding systems Connect NFTs with wallets and IPFS storage 𝟔. 𝐌𝐞𝐦𝐞 𝐂𝐨𝐢𝐧𝐬 Develop and launch meme coins with custom features Provide tokenomics setup and tools for community engagement 𝟕. 𝐃𝐞𝐅𝐢 𝐏𝐫𝐨𝐣𝐞𝐜𝐭𝐬 Build lending, borrowing, staking, farming, and lottery platforms Create custom DeFi solutions for yield optimization 𝟖. 𝐓𝐞𝐥𝐞𝐠𝐫𝐚𝐦 𝐁𝐨𝐭𝐬 & 𝐌𝐢𝐧𝐢 𝐀𝐩𝐩𝐬 Build Telegram trading bots with automated strategies Create mini apps for portfolio tracking, alerts, and transactions Develop automation tools for community management 𝟗. 𝐀𝐝𝐝𝐢𝐭𝐢𝐨𝐧𝐚𝐥 𝐒𝐞𝐫𝐯𝐢𝐜𝐞𝐬 Zero-knowledge proofs for privacy-focused projects RESTful APIs and GraphQL integrations Custom trading bots, DNS setup, deployment, and maintenance 𝐌𝐲 𝐓𝐞𝐜𝐡 𝐒𝐭𝐚𝐜𝐤 𝐁𝐥𝐨𝐜𝐤𝐜𝐡𝐚𝐢𝐧 & 𝐒𝐦𝐚𝐫𝐭 𝐂𝐨𝐧𝐭𝐫𝐚𝐜𝐭𝐬: Solidity, Ether.js, Web3.js, Hardhat, Truffle 𝐅𝐮𝐥𝐥-𝐒𝐭𝐚𝐜𝐤 𝐃𝐞𝐯𝐞𝐥𝐨𝐩𝐦𝐞𝐧𝐭: MERN (React.js, Node.js, Express, MongoDB), Next.js, TypeScript 𝐌𝐨𝐛𝐢𝐥𝐞 𝐃𝐞𝐯𝐞𝐥𝐨𝐩𝐦𝐞𝐧𝐭: React Native 𝐅𝐫𝐨𝐧𝐭𝐞𝐧𝐝 𝐃𝐞𝐯𝐞𝐥𝐨𝐩𝐦𝐞𝐧𝐭: React.js, Next.js, Angular.js, Vue.js 𝐎𝐭𝐡𝐞𝐫 𝐓𝐨𝐨𝐥𝐬: IPFS, Git, Docker, RESTful APIs, GraphQL 𝐂𝐥𝐨𝐮𝐝 & 𝐃𝐞𝐯𝐎𝐩𝐬: AWS, Microsoft Azure I focus on delivering simple, secure, and scalable blockchain solutions that work across multiple networks. Whether you’re planning to launch a DeFi app, NFT project, or a new crypto wallet I can help you turn your idea into reality.

We help Web3 teams launch DeFi protocols, NFT infrastructure, Crypto Wallets, and scalable rollup-based systems – fast, securely, and without over-engineering. No buzzwords. No spaghetti code. Just clean architecture, modular contracts, and deep blockchain thinking. 🔹 What We Build • DeFi Protocols 1/ Lending, staking, vesting, governance 2/ Yield strategies, liquidity protocols, Curve-style AMMs 3/ Modular tokenomics across L1s and L2s 4/ Cross-chain DeFi with LayerZero, Axelar, IBC Tech: Solidity, Vyper, Rust, Hardhat, Foundry, zkSync, Arbitrum, Optimism, Base, Cosmos SDK, Substrate • NFT Infrastructure 1/ ERC721/1155 contracts, marketplaces, royalties 2/ Minting engines, auction logic, NFT staking 3/ NFT + DeFi hybrids (e.g. financial NFTs) Tech: ERC721A, OpenZeppelin, Seaport, IPFS, The Graph, Polygon, zkSync, Avalanche, Blur Protocol • Crypto Wallets 1/ Smart contract wallets (ERC-4337, account abstraction) 2/ Multichain wallet integrations (EVM + non-EVM) 3/ MPC & social recovery flows 4/ Transaction batching, gasless UX, custom signing logic Tech: ethers.js, viem, Wagmi, RainbowKit, Safe, WebAuthn, Passkeys, zkSync AA, Starknet AA, WalletConnect • Rollups & Modular Chains 1/ App-specific rollups with OP Stack or zkStack 2/ DA integration: Celestia, EigenLayer, Rollkit 3/ Custom sequencers, settlement bridges, messaging 4/ Token + gas abstraction, interoperability layers Tech: Starknet, zkSync Era, OP Stack, Substrate, Cosmos SDK, Polygon CDK, Cairo, Noir 🔧 How We Work • Clean, gas-optimized, audit-ready code • Fast iterations, deep collaboration • No overengineering – just outcomes • Honest communication. Real product thinking.

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 build AI-powered SaaS products end-to-end — solo. From database schema to LLM pipeline to deployed product. 6+ years, 50+ projects, clients across Switzerland, USA, Israel, Italy, and India. AI Agents & LLM Workflows — production agents using Claude API, OpenAI, and LangChain. Tool calling, RAG over vector databases (pgvector, Pinecone), structured output validation with Pydantic, retry logic, and eval harnesses so prompt changes never silently break production. Full-Stack SaaS — Next.js, React, TypeScript on the frontend. FastAPI, Python, Node.js on the backend. PostgreSQL and Supabase with Row-Level Security for true multi-tenant isolation — tested, not assumed. Stripe for billing, AWS where needed. Recent work: an autonomous WhatsApp agent that qualifies leads and books appointments with zero human in the loop; an AI image-generation SaaS turning one product photo into catalog-ready shots in 60 seconds; a multi-tenant ERP with role-based access. I write plain-English decision notes instead of jargon, give live demos at milestones, and tell you directly when something's outside my experience — and how fast I can ramp up on it. Stack: Python, TypeScript/Node.js, Next.js, React, FastAPI, PostgreSQL, Supabase, Claude API, OpenAI API, LangChain, RAG, pgvector, AWS, Stripe, Docker. Let's talk about what you're building