SwapRail - Backend Engineer

• Design and implement scalable backend services and APIs • Build routing and aggregation logic for swap execution across multiple liquidity sources • Integrate on-chain and off-chain data sources (RPC nodes, indexers, third-party APIs) • Develop simulation and validation layers for transaction execution • Optimize system performance for low-latency and high-throughput scenarios • Design data models for quotes, routes, transactions, and execution states • Implement monitoring, logging, and observability across services • Collaborate with wallet and frontend teams to ensure consistency in execution flows • Strong experience with Node.js / TypeScript / Go / Rust • Experience building high-performance backend systems • Strong understanding of asynchronous systems and concurrency • Experience with PostgreSQL and data modeling • Familiarity with microservices architecture and distributed systems • Experience integrating blockchain data or Web3 systems • Experience with DeFi protocols or aggregators (1inch, 0x, Uniswap) • Experience building trading or execution systems • Experience with blockchain indexing (The Graph, custom indexers) • Understanding of MEV, routing optimization, and slippage control • Experience with caching layers (Redis) and performance optimization