We're partnering with a really exciting growing technology business on the hire of a Senior Full Stack Engineer to join a newly formed product engineering team. You'll be building new modules and workflow features across their platform, while working in a genuinely AI-first environment where engineers use and build AI agents as part of their everyday development process.

You'll own features end to end across .NET/C#, React and TypeScript, while taking architectural ownership of a significant area of the product. Expect a mix of greenfield development, platform evolution and new AI capabilities, working closely with the Engineering Manager and Principal Engineer.Options market making presents a unique challenge in combining massive scale with complex financial workflows. Every day, Citadel Securities processes billions of market events across more than a million listed options while delivering pricing, execution, and risk management with extremely low latency.