Frontend Developer - Web3 / DeFi
TeamtailorWarszawa, Województwo mazowieckie, Polska11 days ago
Job description3+ years of professional frontend development experience Proven expertise with React, TypeScript, and modern JavaScript (ES6+) Strong understanding of blockchain fundamentals, smart contracts, and how DeFi protocols work Hands‑on experience building Web3 applications using Web3 libraries (ethers.js, web3.js, or equivalent) Experience with wallet integrations (MetaMask, WalletConnect, or other Web3 wallet providers) Familiarity with Ethereum and EVM‑compatible blockchains Experience with state management solutions (Redux, Zustand, Recoil, or similar) Proficiency with CSS / styling solutions and responsive design Version control with Git and collaborative development workflows Strong problem‑solving skills and attention to detail Experience with testing frameworks (Jest, React Testing Library, Cypress, or similar) Experience with multiple blockchain networks (Polygon, Arbitrum, Optimism, Solana, etc.) Familiarity with popular DeFi protocols (Uniswap, Aave, Curve, Lido, etc.) Knowledge of smart contract architecture and ability to read Solidity Experience with GraphQL and subgraphs (The Graph protocol) Experience with Next.js or other full‑stack React frameworks Understanding of Web3 security considerations and best practices Contribution to open‑source Web3 projects Experience with blockchain explorers, Hardhat, or other development tools Knowledge of NFT standards and marketplaces Experience with hardware wallet integrations Familiarity with performance monitoring and optimization tools Frontend Frameworks : React (required), Vue.js, Svelte, or similar frameworks Languages : TypeScript, JavaScript (required) Web3 Libraries : ethers.js, web3.js, wagmi, thirdweb SDK, or equivalent Styling : Tailwind CSS, styled‑components, Material‑UI, or similar Testing : Jest, React Testing Library, Cypress, or Playwright Build Tools : Webpack, Vite, or similar APIs : REST, GraphQL, JSON‑RPC Wallets & Providers : MetaMask, WalletConnect, Coinbase Wallet, Safe Implement wallet connection flows with proper error handling and user feedback Manage Web3 provider interactions and RPC calls Handle transaction creation, signing, and confirmation Parse and display blockchain data (balances, contract state, transaction history) Implement transaction monitoring and status updates Create intuitive interfaces for complex DeFi operations (swaps, liquidity provisioning, lending / borrowing) Design and build reusable component libraries Implement real‑time data visualization and charts Ensure accessibility and mobile responsiveness Optimize for various screen sizes and devices Optimize bundle sizes and load times Minimize unnecessary blockchain queries and RPC calls Implement efficient caching strategies Identify and fix performance bottlenecks Optimize gas estimation and display Implement input validation and sanitization Handle sensitive data (private keys, secrets) securely Validate transactions before signing Implement rate limiting and abuse prevention Keep dependencies up to date and monitor for vulnerabilities Competitive salary and equity compensation Flexible work arrangements (remote / hybrid) Professional development budget Health insurance Collaborative, fast‑paced environment working on cutting‑edge technology Opportunity to shape the future of decentralized finance Mentorship from experienced Web3 developers
Position Overview
We are seeking an experienced Frontend Developer with deep expertise in Web3 and DeFi to join our engineering team. You will be responsible for building intuitive, secure, and high-performance user interfaces for blockchain applications, working with smart contracts, and creating seamless experiences for users interacting with decentralized protocols. This is a key role in shaping the future of our platform.
Key Responsibilities
- Design and develop responsive, user-friendly frontend interfaces for Web3 and DeFi applications
- Build interactive dashboards and tools that allow users to interact with smart contracts and blockchain data
- Integrate with blockchain networks via Web3 libraries (ethers.js, web3.js) and wallet providers (MetaMask, WalletConnect, Ledger)
- Implement real-time data streaming and updates from blockchain networks and protocols
- Write clean, maintainable, and well-tested code with a focus on performance optimization
- Collaborate with backend engineers, smart contract developers, and product teams to define UI / UX requirements
- Implement security best practices specific to Web3, including transaction validation and wallet security
- Optimize frontend applications for gas efficiency and blockchain transaction handling
- Contribute to architectural decisions and technical documentation
- Stay current with Web3 ecosystem developments, tools, and best practices
Required Qualifications
Preferred Qualifications
Technical Skills
Responsibilities Detail
Blockchain Integration
UI / UX Development
Performance & Optimization
Security
What We Offer
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Frontend Developer • Warszawa, Województwo mazowieckie, Polska
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