Hire the Best Hyperledger Developers in Kyiv, UA

VADYM MYKHAILENKO Smart Contract & BackEnd Engineer EXPERIENCE 2024 - 2026 Shogun (Intensity Labs) Lead Backend & Smart Contract Engineer * Designed and built core protocol architecture for an intents-based trading system across EVM, Solana, and Sui: * Developed secure and cost-efficient smart contracts for intent creation, validation and execution * Led backend development for the protocol’s execution infrastructure, including: o Designed orders processing, verification pipelines, auctions, external API for order access and integrations o Implementing on chain efficient trade estimations and safe executions * Architected protocol to support: o Flexible order configuration: single chain / cross chain, market / limit / DCA orders, with new parameters (like trailing stop loss) addable with minimal changes to core logic o 200+ concurrent trades (orders executions) o A scalable multi-chain design extendable to any number of EVM chains * Built cross-chain trading aggregation API (TypeScript) with smart contracts (Solidity/Yul) for extended functionality which: * Supported 13+ chains across 3 chain types * Estimated, compared and provided best quotes for single chain and cross chain trades * Built a high-performance Rust indexer for trading and launchpad protocols across EVM and Solana, covering 30+ protocol types Tech stack: Rust, Solidity, Yul, Anchor, MOVE, TypeScript, PostgreSQL, WebSocket, alloy, Docker 2022 - 2024 BabyDoge Senior smart contracts developer * Developed and deployed smart contracts o DEX, Farming, NFT, Presale and more * Built supporting indexers for smart contract data and protocol operations * Worked on partner integrations, issue analysis, and user-facing protocol incident investigation * Contributed to products that reached: * $75M+ peak TVL * $1B+ trading volume * No hacks/exploits Tech stack: Solidity, Yul, TypeScript, Hardhat, ethers.js 2021 - 2022 ThreeEquals Smart contracts developer * Developed and deployed numerous smart contracts across different use cases * Wrote technical and business documentation for protocol and product requirements Tech stack: Solidity, TypeScript, Hardhat, ethers.js EDUCATION Master's degree 2011 National Aviation University Information protection of computer systems and networks PROFESSIONAL SUMMARY Senior protocol engineer with experience building smart contracts and backend systems for trading, execution, and cross-chain infrastructure. Worked across EVM, Solana, and Sui, with hands-on ownership of execution-critical systems including order processing, trading, estimations, and indexers. Strong focus on performance, security, flexibility, and building reliable systems that operate under real production load. Languages: * English * Ukrainian * Russian

We help Web3 teams launch Trading Automation Platforms, DeFi protocols, NFT infrastructure, RWA Platforms, Crypto Banks, and scalable rollup-based systems — fast, secure, and without overengineering. Just clean architecture, modular contracts, and deep blockchain expertise. We care about proper Security Audit and backed by Hacken.io 🔹 What We Build • Rollups & Modular Chains App-specific rollups using OP Stack, zkStack Data availability integrations: Celestia, EigenLayer, Rollkit Custom sequencers, settlement bridges, cross-chain messaging Gas abstraction, token interoperability, modular infrastructure Tech: Starknet, zkSync Era, OP Stack, Substrate, Cosmos SDK, Polygon CDK, Cairo, Noir • CEX/DEX Trading Platforms & Tools Centralized exchange trading interfaces and matching engines Decentralized trading protocols (AMMs, order books, RFQ systems) Custom bots, signal-driven trading infra, MEV protection On-chain and off-chain analytics dashboards Tech: TypeScript, Node.js, Python, WebSockets, REST APIs, TradingView, CCXT, Hummingbot, 0x, UniswapX, Vertex, dYdX, GraphQL, PostgreSQL • DeFi Protocols Lending, staking, vesting, governance Yield strategies, liquidity protocols, Curve-style AMMs Modular tokenomics across L1s and L2s Cross-chain DeFi with LayerZero, Axelar, IBC Tech: Solidity, Vyper, Rust, Hardhat, Foundry, zkSync, Arbitrum, Optimism, Base, Cosmos SDK, Substrate • NFT Infrastructure ERC721/1155 contracts, marketplaces, royalties Minting engines, auctions, NFT staking NFT + DeFi hybrids (e.g., financial NFTs) Tech: ERC721A, OpenZeppelin, Seaport, IPFS, The Graph, Polygon, zkSync, Avalanche, Blur Protocol • Crypto Wallets Smart contract wallets (ERC-4337, account abstraction) Multichain wallet integrations (EVM + non-EVM) MPC & social recovery flows Gasless UX, transaction batching, custom signing logic Tech: ethers.js, viem, Wagmi, RainbowKit, Safe, WebAuthn, Passkeys, zkSync AA, Starknet AA, WalletConnect 🔧 How We Work • Clean, gas-optimized, audit-ready code • Fast iterations, deep collaboration • No overengineering — just outcomes • Honest communication, real product thinking

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.

I am passionate about creating maintainable, secure, and performant applications using Golang. I use clean code practices and make my code easy to support and understand. Additionally, I am keen on cyber security and networking, and well-known with blockchain concepts. I always make sure that code is well-tested, easy to understand, and add new features. Currently working as Golang (DevOps oriented) Engineer.