Susquehanna is a global trading firm that uses its own capital to trade across virtually all listed financial products, with a strong focus on derivatives. We combine expertise in trading, technology, and quantitative research to execute millions of transactions daily.

We’re seeking a Senior Full-Stack Developer to build high-performance tools and internal systems for our trading and quant research teams. This hands-on role involves close collaboration with front-office stakeholders to deliver scalable, robust solutions that directly impact trading strategies—an exciting opportunity at the intersection of finance and technology.

Responsibilities

• Design, develop, and maintain full-stack applications that support trading and research workflows.
• Build scalable, high-performance systems using modern object-oriented languages (e.g., C#, Java).
• Develop and integrate with distributed systems and event-driven architectures (e.g., Kafka).
• Contribute to both backend and frontend development; experience with Angular or similar frameworks is beneficial.
• Optimise multi-threaded applications for performance and reliability.
• Collaborate directly with traders, quants, and other stakeholders to gather requirements and deliver tailored solutions.
• Participate in all stages of the software development lifecycle, from design to deployment and support.
• Ensure the stability, performance, and maintainability of mission-critical systems.
• Stay current with emerging technologies and contribute to continuous improvement initiatives.

• 6+ years of software development experience with strong OOP skills.
• Proficient in modern languages (e.g., C#, Java).
• Solid grasp of distributed systems, messaging (e.g., Kafka), and concurrency.
• Familiar with container orchestration (e.g., Kubernetes, Docker Swarm).
• Experience in client-facing/front-office roles, ideally in financial services.
• Strong analytical, problem-solving, and communication skills.
• Degree in Computer Science, Engineering, Mathematics, or related field (or equivalent experience).

Nice to have

• Experience with UI frameworks (e.g., Angular, WPF).
• Exposure to Complex Event Processing (CEP).
• Background in high-performance or low-latency systems.
• Familiarity with cloud platforms and scalable architectures

If you're a recruiting agency and want to partner with us, please reach out to recruiting@sig.com. Any resume or referral submitted in the absence of a signed agreement will not be eligible for an agency fee.

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