C++ Developer

About Millennium
Millennium is a global, diversified alternative investment firm, founded in 1989. Defined by evolution, innovation and focus, Millennium's mission is to deliver results for our investors. Our people are empowered with both independence and support: the autonomy to pursue ideas with conviction and the backing of a global network committed to collaboration, disciplined risk management and continuous learning. With opportunities to deepen expertise and accelerate development, talent at Millennium is equipped to adapt, evolve and build lasting impact over time. Discover how transformative growth accelerates impact.

Meet the Team
Information Technology is core to the health and growth of Millennium's business, supporting a flexible, scalable technology environment and advanced proprietary systems across the firm. The team builds and operates the C++ backend services that power Millennium's real-time risk and P&L platform. The platform is a distributed system of microservices running on AWS and Kubernetes, processing large-scale financial data with strict latency requirements. The team collaborates closely with quantitative developers, platform engineers, and business stakeholders to support production services that operate 24/5.

What You'll Do
• Design, build, and operate high-performance C++ services that calculate real-time pricing, risk, and P&L across fixed income and credit instruments.
• Own service reliability end to end, including monitoring, alerting, incident response, and root cause analysis in a live production environment.
• Write thread-safe, exception-safe C++ code for concurrent, near-real-time workloads with hard latency targets.
• Optimize service performance by profiling hotspots, reducing memory allocations, improving cache behavior, and tuning throughput under load.
• Integrate C++ services with upstream and downstream systems using Kafka, Protobuf, and internal APIs.
• Contribute to CI/CD pipelines, including automated regression testing, A/B deployment, and blue/green release management.
• Promote engineering best practices through code reviews, exception safety, RAII patterns, and robust error handling in a multithreaded environment.

What You Bring
• Bachelor's degree in Computer Science, Software Engineering, or a related discipline; advanced qualifications are a plus.
• Previous experience developing C++ services or systems.
• Strong hands-on experience with modern C++ (C++17/C++20), including move semantics, smart pointers, RAII, templates, and constexpr.
• Solid understanding of multithreading and concurrency, including mutexes, atomics, lock-free structures, thread pools, and race condition debugging.
• Experience building and operating long-running backend services, along with familiarity with service-oriented architecture, message queues such as Kafka, and serialization frameworks such as Protobuf or FlatBuffers.
• Proficiency with Linux, GDB/LLDB, profiling tools such as perf, Valgrind, and AddressSanitizer, and CI/CD pipelines.
• Strong analytical, troubleshooting, and communication skills, including the ability to diagnose production issues under pressure and collaborate across teams in a fast-paced environment.