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