Backend developer in DeFi

Tangem is a high-tech company in the blockchain sector was founded in 2017, headquartered in Zug, Switzerland, with branches in North America, Eastern Europe, and APAC. Tangem started with the idea of bringing digital assets to the masses using a unique combination of a smartcard-based hardware wallet and mobile applications.

• Add support for new chains, new fee tokens, and new yield protocols
• Build the backend layer that signs, broadcasts, and monitors on-chain transactions
• Implement meta-transaction flows on top of standards like EIP-712 and EIP-7702
• Handle on-chain event ingestion through webhooks and background jobs
• Own production releases — migrations, rollback plans, RPC failover
• Write unit, integration, and E2E tests, instrument services for observability
• Participate in planning, estimation, and architecture decisions

• Strong production experience with Node.js and a modern framework like NestJS
• Hands-on experience building on EVM chains with Ethers.js or viem
• Familiarity with the EVM transaction model — signing, gas, nonces, RPC failover
• Experience with PostgreSQL and writing efficient SQL
• Solid understanding of common application security vulnerabilities
• Experience writing unit and end-to-end tests
• Experience with monitoring, logging, and debugging production issues
• Будет плюсом: Background in DeFi infrastructure; Familiarity with modern transaction / meta-tx standards like EIP-7702, ERC-2771, ERC-4337; Experience with distributed locking and concurrency primitives

• Stability, development, participation in the future unicorn's growth
• Remote work from anywhere in the world
• Competitive salary in EURO/USDT
• Unlimited vacation
• Birthday presents
• Compensation for the purchase of necessary technical devices for the work
• Paid sick leaves