Java Software Engineer | Systematic Trading London | £120,000-£160,000 + bonusJava, Trading Execution, Python The Role:This is a hands-on Java engineering role sitting close to the trading desk, focused on the evolution of a proprietary execution platform used in live markets. The work is visible, commercially relevant, and directly tied to trading performance. You will own key components of the execution stack and play a central role in improving how orders interact with the market. The Tech Stack:Java, Python, distributed architecture, trading systems, execution analytics What You Will Be Doing:* Owning and developing core parts of an in-house trading and execution platform, with a focus on performance and reliability* Partnering with trading and research teams to improve execution quality and refine algorithmic behaviour* Integrating and onboarding new brokers, as well as enhancing existing connectivity and workflows* Building and maintaining tools that analyse execution performance and trading costs* Contributing to broader platform design, including scalability and system architecture decisions* Supporting production systems, including involvement in a rota once up to speed What You Bring:* Strong Java engineering background, with solid experience building high-performance systems* Exposure to electronic trading environments, ideally with a focus on execution* Understanding of any cash markets trading business or similar liquid asset classes* Experience working in a bank