Senior Software Engineer
About the role
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 business — your work has immediate, measurable impact from day one.
The Opportunity
We are building our Sri Lanka engineering hub and looking for two Senior Software Engineers to be founding members of that team. Working alongside our global engineering organisation, you will take full ownership of features end-to-end — from design through delivery and into production. Your work will power live trading infrastructure used by some of the world’s most demanding market participants.