Senior Backend Developer

About the Role You will own two production-critical services: a DeFi yield product that lets users earn on crypto through leading EVM lending protocols without giving up custody, and a gasless transaction service that relays signed transactions while paying gas in ERC-20 stablecoins. You will add support for new chains and fee tokens, implement meta-transaction flows (EIP-712, EIP-7702), build backend layers that sign broadcast and monitor on-chain transactions, handle on-chain event ingestion via webhooks and background jobs, manage production releases including migrations rollback plans and RPC failover, write unit integration and end-to-end tests, and instrument services for observability.

Requirements Strong production experience with Node.js and frameworks like NestJS Hands-on experience building on EVM chains with Ethers.js or viem Familiarity with the EVM transaction model including signing gas nonces and 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

Responsibilities Add support for new chains fee tokens and yield protocols Build backend layer that signs broadcasts and monitors on-chain transactions Implement meta-transaction flows based on EIP-712 and EIP-7702 Handle on-chain event ingestion via webhooks and background jobs Own production releases including migrations rollback plans and RPC failover Write unit integration and end-to-end tests Instrument services for observability Participate in planning estimation and architecture decisions

Benefits Remote work from anywhere in the world Unlimited vacation Birthday presents Compensation for purchase of necessary technical devices Paid sick leaves Senior Backend Engineer Finapps/Access Fireblocks · 1 day ago Senior Python Engineer (Remote) Crystal Blockchain B.V. · 1 week ago Senior Python Engineer Crystal Blockchain B.V. · 1 week ago Senior Software Engineer, Backend & API Integrations Reap · 3 weeks ago Senior Backend Engineer (Node.js / Web3 / Distributed Systems) deBridge Finance · 3 weeks ago Senior Backend Engineer Finapps/Access Fireblocks · 1 day ago Senior Python Engineer (Remote) Crystal Blockchain B.V. · 1 week ago Senior Python Engineer Crystal Blockchain B.V. · 1 week ago Senior Software Engineer, Backend & API Integrations Reap · 3 weeks ago Senior Backend Engineer (Node.js / Web3 / Distributed Systems) deBridge Finance · 3 weeks ago