Web3 Talent

20+ years building production software, with deep expertise in low-latency trading, options and distributed systems.

Led exchange engineering across matching and limit order books, option chains, real-time risk, liquidation and institutional RFQ services. Delivered latency-sensitive SBE streams alongside REST and WebSocket APIs.

Built multi-venue execution and smart order routing across crypto and traditional markets, including FIX connectivity, adaptive rate limits, transaction cost analysis, Greeks-based limits and production kill switches.

Created open-source Rust projects: OrderBook-rs for limit order books and advanced order types; OptionStratLib for options pricing, Greeks, simulation and strategy analysis; market-maker-rs for market making, risk controls and backtesting.

Own delivery from architecture and implementation to deployment and observability, using Rust, C++, Go, Python, PostgreSQL, Redis, NATS/Kafka, Kubernetes and AWS.

Based in Madrid, Spain. Available immediately for fully remote senior quant or backend roles with very small teams, ideally 1 to 10 people. Open to companies worldwide. Target compensation: approximately USD 150,000 annually; contract rate: USD 100/hour.

Portfolio: https://joaquinbejar.capitaldelta.co Telegram: https://telegram.me/joaquin_bejar