Built a Dex from zero. Matching engine, risk engine, oracle network, infra. The CLOB runs in Rust, fully on-chain, and handles 50k+ orders a second with sub-millisecond fills. The cross-margin risk engine has been through multiple major volatility events without down time.

Came in to fix the matching engine and ended up rebuilding the whole thing in Rust.

6x throughput improvement, 40% off memory at peak load. Brought in formal verification with TLA+ for consensus changes. Big distributed systems.

Rebuilt the core processing backend when the business was scaling fast and the old system couldn't keep up