Senior Full-Stack TypeScript Engineer - Web3 / FinTech / Trading
We are looking for a strong Senior Full-Stack developer for a product at the intersection of Web3, fintech, and trading.
We need a person who can look at the product holistically, make independent technical decisions, and deliver tasks to production.
Location: we are considering candidates who permanently reside outside of Russia, CIS, and Southeast Asia. Priority is given to Europe and its closely related time zones.
What you will be doing
- Develop the product using TypeScript / React / Next.js - frontend and backend.
- Work with real-time data, WebSockets, and trading interfaces.
- Design data structures and work with PostgreSQL.
- Integrate blockchain, wallets, and external APIs.
- Work with the product's financial logic, where operational correctness and data consistency are critical.
- Develop a full-fledged mobile web.
- Use Claude Code as the primary tool for daily development.
What is important to us
- 5+ years of commercial development experience.
- Strong TypeScript, React, and Next.js skills.
- Backend development and PostgreSQL experience.
- Experience launching products or significant parts of a product 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 working with viem or ethers.
- Good understanding of frontend performance and mobile web development.
- Strong engineering background: you can independently write, read, analyze, and debug code.
- Furthermore, in your current work, you have already transitioned to Claude Code and use it as your primary working tool. We need a developer who can do everything independently if necessary, but currently works actively and daily through Claude Code.
Will be a strong plus
- Experience with prediction markets: Polymarket, Kalshi, or similar.
- Trading systems / order book.
- Embedded wallets, relayers, meta-transactions.
- ERC-4337 / Account Abstraction.
- Cross-chain bridges, Polygon, Supabase.
