HFT C++ Core Systems Developer - 5-15 years experience

We are seeking an exceptional Core C++ Developer to contribute to the development and optimization of our high-performance trading systems. This role focuses on building ultra-low-latency infrastructure, optimizing execution speed, and ensuring robust system reliability. The ideal candidate will have deep expertise in modern C/C++, systems programming, and high-performance computing.

• Design, develop, and optimize low-latency, high-performance trading infrastructure in modern C/C++ (latest standards).
• Implement efficient and scalable trading algorithms, order execution, and risk management systems.
• Deep understanding of exchange connectivity standards for market data and order entry
• Optimize CPU performance, memory management, and multi-threaded applications.
• Collaborate with quant researchers, traders, and infrastructure engineers to improve system performance.
• Profile, benchmark, and debug real-time systems to minimize latency and maximize throughput.
• Maintain robust and fault-tolerant system components for continuous trading operations.

• Very competitive compensation, with strong upside based on contribution and performance
• Competitive holiday allowance 
• Free daily Deliveroo lunch
• High-spec office and technology
• Team socials
• Global company offsites and development opportunities

Selini is a global trading firm focused on systematic trading and venture investing. 

• Candidates with exceptional academic or industry backgrounds.
• Strong analytical skills and ability to work in high-pressure, real-time environments.
• Collaborative team player who enjoys solving complex engineering problems.

We’re a close-knit team that values:

• High ownership and initiative
• Curiosity, intellectual honesty, and rapid learning
• Clear, direct communication
• Working together toward shared goals — no ego, no politics

Technology

• Expert-level proficiency in C++, with a strong grasp of modern C++ features (C++17/20/23/26).
• Extensive experience in low-latency, high-performance systems programming.
• Deep understanding of networking (TCP/UDP), concurrency, and multi-threading.
• Strong experience in Linux-based development and performance tuning.
• Experience with real-time, high-throughput systems where performance is critical.
• Background in crypto or traditional finance trading systems