Backend Engineer
TLDR
Build scalable backend systems powering SwapRail, enabling low-latency routing and cross-source execution with on-chain/off-chain data integration.
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
SwapRail builds a professional self-custody wallet specifically for users looking to make clear and secure cross-chain swaps between EVM networks and Solana. By prioritizing transparency and operational clarity, it provides users with understandable fee structures, transaction summaries, and a focused pathway for moving assets, setting itself apart from generic crypto wallets.