Hire the Best Solidity Freelancers
in Ukraine

👨‍💻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.

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.

Fullstack Web3 developer with experience in creating different types of dApps. My goal is to build the best web3 applications using the latest technologies. I have a good understanding of EVM blockchains and know how to solve any type of web3 challenge. I intend to explore new technologies and deliver value to people.

Summary: A highly motivated Blockchain Engineer with a robust blend of theoretical knowledge and hands-on development expertise. With a proven track record in mastering and implementing cutting-edge technologies, I pride myself on ensuring client satisfaction and fostering long-term relationships. My experience spans across various blockchain platforms and back-end technologies, making me a versatile asset in the ever-evolving tech landscape. Education: KHARKIV POLYTECHNICAL INSTITUTE Master’s degree in Software Engineering SEP 2009 - JUN 2014 Doctor of Philosophy - PhD, Computer ScienceDoctor of Philosophy - PhD, Computer Science SEP 2019 - MAR 2024 Languages: Ukrainian: Native Speaker Russian: Native Speaker English: Upper-Intermediate Technical Proficiency: Blockchain Technologies: Ethereum, Solana, Solidity, Rust, Hadhat, NodeJS, Web3JS, VueJS, and more. Back-end Technologies: Firebase, Kafka, Go base, Confluent-kafka, Akka, Cassandra, and more. Database Management: PostgreSQL, MongoDB, MySQL, Redis. Tools & Platforms: Vs Code, IntelliJ IDEA, WebStorm, Atom, Jenkins, Docker, Git, SVN, Jira, Trello. Projects: ChromaWay: Blockchain technology company focused on relational blockchain architecture. Roci.fi: A DeFi primitive for permissionless under-collateralized lending on Ethereum. Highvibe Network: Blockchain-based ecosystem for immersive experiences and multidimensional learning. BigTaurus: Crypto and Forex training platform with Token BGT CLUB. Korporatio: Merging International Business Company (IBC) and Decentralized Autonomous Organisation (DAO) to form Smart Companies.

✅ 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.

🌟 Your Trusted Partner for Web & Web3 Development 🌟 Hi, I’m Viktor, the founder of Vizzwo, a Ukraine-based company specializing in creating modern Web and Web3 solutions. We provide end-to-end product development, covering every stage: ✅ Design creation ✅ Development ✅ Deployment on AWS or/and launching on the blockchain mainnet 💻 Our Technology Stack: 🚀 Frontend Development: - Vanilla JavaScript - ReactJS - Next.js - TypeScript 🔧 Backend Development: - Golang - PostgreSQL / Redis / MongoDB - Solidity ☁️ Infrastructure & DevOps: - AWS - Docker, Kubernetes - Terraform ❓ Didn’t find the technology you’re looking for? No worries! Just send me a message—we likely have the expertise you need. ✨ Let’s bring your ideas to life. Whether it’s a modern website, a high-performance application, or an innovative Web3 solution, Vizzwo is here to help. 📩 Message me today, and let’s get started!