Senior Full-Stack TypeScript Engineer - Web3 / FinTech / Trading

Senior Full-Stack TypeScript Engineer for a Web3/fintech/trading product. TypeScript/React/Next.js, backend, real-time data, WebSockets, PostgreSQL, blockchain integrations. Candidates outside Russia/CIS/SEA; Europe preferred.

Product at the intersection of Web3, fintech and trading. Responsibilities: - Develop the product using TypeScript / React / Next.js across frontend and backend. - Work with real-time data, WebSockets and trading interfaces. - Design data and work with PostgreSQL. - Integrate blockchain, wallets and external APIs. - Work on financial logic where correctness and data consistency are critical. - Develop a full-fledged mobile web. - Use Claude Code as the main daily development tool.

5+ years of commercial development. Strong TypeScript, React and Next.js. Backend development and PostgreSQL experience. Experience launching products or large parts of products end-to-end. Experience in fintech, crypto, trading, payments, wallets or other systems with real financial operations. Experience with WebSockets / streaming / real-time data. Experience with blockchain integrations and viem or ethers. Good understanding of frontend performance and mobile web development. Strong engineering background: able to write, read, analyze and debug code independently. Currently using Claude Code as the main working tool. Must permanently reside outside Russia, CIS and Southeast Asia; Europe and close time zones preferred. Nice to have: - Prediction markets: Polymarket, Kalshi or similar. - Trading systems / order book. - Embedded wallets, relayers, meta-transactions. - ERC-4337 / Account Abstraction. - Cross-chain bridges, Polygon, Supabase.