Rust Software Engineer

About Onyx Capital Group

Onyx Capital Group is the world’s #1 liquidity provider for energy derivatives, trading over $3.2 trillion in notional value annually. Through Onyx Commodities, the Flux Terminal, and our trading division Axis, we dominate the benchmarks that matter — Dated Brent, S2F contracts, and beyond. We are not a bank. We are not a hedge fund. We are a technology-driven market-making powerhouse at the intersection of global energy markets, data, and engineering — and we are growing fast.

Engineering at Onyx

We don’t hire passengers — we hire pilots. Every engineer here takes ownership, pushes back when the design isn’t right, and holds the bar high without being asked. We practise TDD, design for observability from day one, and treat software craftsmanship as a genuine competitive advantage. The team is small, senior, and embedded directly in the trading floor. There are no layers of abstraction between you and the b...