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7+ 𝐲𝐞𝐚𝐫𝐬 of building crypto wallets, DeFi apps & fintech platforms - from idea to App Store. If you're launching a crypto wallet, DeFi mobile app, trading platform, or fintech product - you're in the right place. I specialize in React Native mobile development for the crypto and fintech space. I don't just write code - I help you ship a product that users actually want to open every day. 𝐖𝐡𝐚𝐭 𝐈 𝐁𝐮𝐢𝐥𝐝 Crypto Wallets - custodial and non-custodial wallets for iOS and Android. Multi-chain support: Ethereum, Solana, TON, BSC, Polygon, TRON and other EVM chains. DeFi and Web3 Mobile Apps - DEX integrations, staking dashboards, yield farming UIs, token swaps, NFT portfolios - all connected to smart contracts via Web3.js and Ethers.js. Fintech Mobile Apps - payment systems, digital wallets, P2P transfers, real-time transaction monitoring, KYC flows, and open banking integrations. Trading Bot Interfaces - mobile frontends for algorithmic trading systems, CEX/DEX dashboards, real-time PnL tracking, copy trading UIs. Smart Contract Integration - connecting your mobile app to Solidity (EVM) or FunC (TON) smart contracts. Secure, tested, production-ready. Crypto Exchange Apps - full-featured exchange interfaces with order books, real-time charts, wallet management, and API integrations (Binance, Bybit via CCXT). 𝐓𝐞𝐜𝐡 𝐒𝐭𝐚𝐜𝐤 On the mobile side I work with React Native, building cross-platform iOS and Android apps with Expo. For blockchain integrations I connect to Ethereum, Solana, TON, BSC, Polygon, TRON and other EVM chains using web3.js and Ethers.js. Smart contracts - Solidity for EVM chains, FunC for TON, Rust for Solana. On the backend I use Python, Node.js, FastAPI, PostgreSQL, MongoDB, Redis and WebSockets. For automation and bots - Playwright, Selenium, aiogram for Telegram. Infrastructure runs on Docker with CI/CD via GitHub Actions. 𝐖𝐡𝐚𝐭 𝐌𝐚𝐤𝐞𝐬 𝐌𝐞 𝐃𝐢𝐟𝐟𝐞𝐫𝐞𝐧𝐭 Most mobile developers can build a UI. I understand how crypto products work - blockchain architecture, wallet security, gas optimization, on-chain data, smart contract interaction - and I build mobile apps that handle all of it correctly. Whether you need a crypto wallet like Trust Wallet, a DeFi dashboard, a fintech MVP, or a trading bot mobile frontend - I've built products across all these verticals. Clean architecture, scalable from day one. Security-first mindset, especially critical for financial apps. Full ownership from wireframe to App Store and Google Play. Fast delivery - MVPs in 4 to 8 weeks. 𝐑𝐞𝐜𝐞𝐧𝐭 𝐖𝐨𝐫𝐤 Crypto wallet with multi-chain support (EVM + TON) and biometric auth. DeFi mobile app with staking, farming, and token swap via Uniswap. Fintech platform with P2P payments, real-time ledger, and KYC integration. Telegram trading bot with mobile monitoring dashboard. 𝐋𝐞𝐭'𝐬 𝐓𝐚𝐥𝐤 𝘉𝘶𝘪𝘭𝘥𝘪𝘯𝘨 𝘢 𝘤𝘳𝘺𝘱𝘵𝘰 𝘸𝘢𝘭𝘭𝘦𝘵, 𝘋𝘦𝘍𝘪 𝘢𝘱𝘱, 𝘰𝘳 𝘧𝘪𝘯𝘵𝘦𝘤𝘩 𝘱𝘭𝘢𝘵𝘧𝘰𝘳𝘮? 𝐒𝐞𝐧𝐝 𝐦𝐞 𝐚 𝐦𝐞𝐬𝐬𝐚𝐠𝐞 - I'll review your idea and suggest the right architecture before we write a single line of code.

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.

✅ 8+ Years in Blockchain & Full-Stack Development - Solidity smart contracts, dApps, and Web3 infrastructure, end to end. ✅ 20+ Blockchain Projects Shipped - smart contracts, dApps, and on-chain integrations across Ethereum/Polygon/etc. ✅ Full Stack, Not Just Contracts - I build the smart contract layer and the React/TypeScript frontend that talks to it, so there's no handoff gap between chain and UI. ✅ AI x Web3 - experience building AI agents that interact with on-chain data and automate DeFi/trading workflows, not just theory. ✅ Security-Minded Development - contracts written and reviewed with gas efficiency, auditability, and attack-surface reduction in mind from day one. 👋 Hey, I'm Myroslav - a blockchain and full-stack developer specializing in Solidity smart contracts, dApp development, and DeFi infrastructure. I write and deploy smart contracts, integrate wallets and on-chain data, and build the AI agents that are starting to automate trading, monitoring, and DeFi strategy execution. I care about understanding systems at the level that actually matters in this space: how a contract behaves under edge cases, where gas gets wasted, what happens when an oracle lags, why an agent's decision logic needs guardrails before it touches real funds. That's the standard I hold my own work to. 💡 Technologies & Tools Smart contracts in Solidity, deployed and tested across Ethereum and EVM-compatible chains. Backend services in Node.js, NestJS, and TypeScript to bridge off-chain logic with on-chain state. Frontends in React for dApp UIs and wallet-connected interfaces. Rust for performance-critical services / non-EVM chain work . PostgreSQL for indexing on-chain data and serving it fast. Python for scripting, data pipelines, and AI agent logic layered on top of blockchain infrastructure. 🚀 Use Cases I Deliver 🔗 Custom smart contracts - token standards, staking, vesting, access control; 🏦 DeFi protocol components - yield logic, swaps, liquidity integrations; 🤖 AI agents that read on-chain data and execute or recommend actions (trading, monitoring, alerting); 🧩 dApp frontends with wallet connection, transaction signing, and live on-chain state; 📊 Indexing and analytics layers (PostgreSQL-backed) for protocols that need fast, queryable on-chain history; 🛠 Full-stack Web3 products - contract, backend, and frontend under one roof. 🧑‍💻 Highlighted Services - Smart contract development & deployment (Solidity) - dApp frontend development (React + TypeScript, wallet integration) - Backend/API development for Web3 products (Node.js, NestJS) - AI agent development for on-chain automation - On-chain data indexing and reporting (PostgreSQL) - Smart contract review and gas optimization - Full-stack delivery from contract to UI 🌍 Industries Served DeFi, Web3 Infrastructure, AI, Crypto Trading & Automation, FinTech. 🛠 Project Workflow ✅ Requirements & architecture review (on-chain vs off-chain split); ✅ Contract design & writing, with test coverage from the start; ✅ Backend/API and indexing layer setup; ✅ Frontend integration (wallet connect, transaction flows); ✅ Testing — unit, integration, and testnet deployment; ✅ Mainnet deployment & documentation handoff. 🔑 Core Qualities ✔️ Solidity and full-stack fluency - no gaps between contract and product; ✔️ Security and gas-efficiency as defaults, not afterthoughts; ✔️ Comfortable owning a project end-to-end or slotting into an existing team; ✔️ Clear communication, realistic timelines; ✔️ Clean, documented, maintainable code. 🔗 Let's Connect If you're building a smart contract, a DeFi feature, or an AI agent that needs to operate safely on-chain, send an invite and let's talk through scope. Available for one-time contracts or long-term collaboration.

👨‍💻4yrs+ Experience A smart contract developer with over 4 years of experience building DeFi and blockchain infrastructure on EVM networks. I specialize in smart contract architecture, protocol integration, and security-focused development. I have experience working with Uniswap V3/V4, account abstraction, staking protocols, and upgradeable contract patterns. I am passionate about building scalable decentralized financial infrastructure.

✅ Top Rated Web3 Developer 🙋‍♂️ Greetings! My name is Sergey and I am a professional Solidity developer with over 5 years of experience. I possess deep knowledge in blockchain technologies, particularly in Ethereum and Smart Contracts. 📚 Over the past 5 years, I've been actively involved in various blockchain projects including DeFi, NFT, DAO, and DApps, employing technologies such as Solidity, Truffle, Hardhat, and Web3.js. My experience includes developing secure and optimized smart contracts, conducting code audits, writing tests, and developing user interfaces for interacting with smart contracts. 🔬 My specialization: 👨‍💻 Solidity smart contract development 🕵️‍♂️ Smart contract audit and optimization 🌐 DApp development using Web3.js/ethers.js 🧪 Testing using Ganache, Mocha, and Truffle 🛠 Working with open frameworks like OpenZeppelin and Hardhat 💰 Developing and integrating ERC20, ERC721, ERC1155, and ERC1400 tokens 📈 DeFi protocols and yield farming strategies 🎨 NFT platforms and marketplace development 👥 DAO creation and governance mechanisms 🚀 Layer-2 solutions integration (like Optimism, zkSync, Arbitrum) 🔗 Interoperability solutions (like Polkadot, Cosmos) 🔮 On-chain and off-chain data interaction with Oracles 🔄 Upgradable smart contracts design 📊 Developing decentralized exchanges (DEX) 💼 Integrating crypto wallets and creating secure wallet libraries ⛽ Gas optimization for transactions and smart contracts 📉 Blockchain data analytics and querying with TheGraph 💼 In my work, I strive to deliver reliable and secure products while always adhering to project deadlines. I place great emphasis on clean, structured, and readable code that adheres to best development practices and ensures high system performance and reliability. 🤝 If you need a Solidity developer capable of creating a secure and efficient smart contract or blockchain application, I would be glad to discuss your project. Let's create something amazing together! Tags: #Solidity #Blockchain #Ethereum #SmartContracts #DApps #DeFi #NFT #DAO #Web3js #Truffle #Hardhat #OpenZeppelin #ERC20 #ERC721 #ERC1155 #ERC1400 #Layer2 #Optimism #zkSync #Arbitrum #Polkadot #Cosmos #Oracles #UpgradableSmartContracts #DEX #CryptoWallets #GasOptimization #TheGraph

We are a Blockchain & Web3 development team delivering full-cycle solutions - from idea to mainnet launch Our core focus is building scalable, secure, and production-ready Web3 products using modern tech stack and proven architecture. 🔧 Our Tech Stack Blockchain: Solidity, EVM (Ethereum, Arbitrum, BNB Chain, Polygon, Avalanche), Smart Contracts, Web3 integrations Frontend: React.js, Next.js, Web3.js, Ethers.js, Wagmi, WalletConnect Backend: Node.js, Express.js, NestJS, REST APIs, WebSockets Mobile: React Native (Web3 wallets, mobile dApps) Infrastructure: Docker, AWS, CI/CD, Hardhat, Foundry 💼 What We Build Smart Contracts (ERC20, ERC721, ERC1155) Token Development & TGE Launch DeFi Platforms (staking, lending, yield farming) DApps (full-stack Web3 applications) Launchpads & IDO Platforms Crypto Payment Integrations (on/off-ramp, wallets) Custom Web3 Dashboards & Admin Panels (реально відображає ваші кейси типу токенів, TGE, launchpad ) ⚙️ How We Work End-to-end development (Smart Contracts + Frontend + Backend) Clean, maintainable and scalable architecture Security-first approach (testing, audits, best practices) Fast delivery with clear milestones 🧠 Why Clients Choose Us Strong expertise in Web3 / Blockchain / DeFi Experience with tokens, staking, launchpads, and complex dApps Deep understanding of product + business logic, not just code Dedicated team (Blockchain + Frontend + Backend + PM) 📩 Let’s Build Your Web3 Product If you are looking to build a token, DeFi platform, dApp or full Web3 ecosystem - we can help you deliver it fast and right.