Senior Software Engineer

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 

We are seeking an experienced Technical Lead / Senior Software Engineer to join our high performing Execution Services Technology Team. This role will provide technical leadership across mission-critical trading platforms, with a focus on order management systems, low-latency infrastructure, production stability, and platform modernization. The ideal candidate brings strong engineering fundamentals, hands-on production support experience, architectural strength, and a passion for mentoring teams in a high-performance environment.

What You'll Do

• Lead the design, development, and support of critical trading platforms, provide technical leadership for low-latency and high-availability systems, and drive platform modernization initiatives.
• Act as a senior escalation point for production incidents, troubleshoot complex performance and stability issues, and drive improvements in system scalability, resiliency, and operational excellence.
• Partner with global teams and stakeholders to deliver reliable, high-quality solutions while mentoring engineers and promoting strong engineering standards, collaboration, and knowledge sharing.

What You Bring

• 8+ years of software engineering experience, preferably in financial services or other high-availability environments.
• Strong experience with distributed, event-driven & low-latency systems and a solid background in systems design, performance optimization, and production support.
• Proven ability to lead technical initiatives and solve complex production issues.
• Strong communication & problem-solving skills and experience mentoring engineers and working across cross-functional teams.
• Experience with order management systems (OMS) or trading infrastructure.
• Familiarity with StreamBase, Solace, Tibco, SoupTCP, or similar technologies.
• Experience modernizing legacy systems and designing APIs.
• Exposure to test automation and reliability-focused engineering practices.