Backend Engineer

Design and build the core backend systems powering SwapRail, including APIs, routing engines, execution services, and data pipelines. Location: Remote / Work from Home Type: Part-time preferred / Full-time available Responsibilities - 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 Requirements - 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 Nice to Have - 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