Senior Security Engineer - Linux Authentication

Job Title: Principal Engineer, Linux Authentication & Security

Location: New York, Hybrid working.

Compensation: Highly competitive compensation including generous bonus and benefits.

The Opportunity:

Join one of the world's most successful quantitative investment firms, where technology and engineering are the foundation of their business. They operate a massive, global, high-performance computing environment that powers mission-critical investment activity and research. Their engineering teams are comprised of elite problem-solvers who thrive on tackling the most complex challenges in infrastructure, security, and distributed systems.

We are seeking a Principal-level Engineer to join their core engineering team. This is not a typical security role. You will be an architect and a hands-on builder, responsible for engineering the fundamental authentication and security services that underpin their entire global Linux infrastructure. If you are a deep technical expert who wants to design and implement critical security systems at immense scale, this is the role for you.

What you'll do:

• Architect, design, and drive the end-to-end implementation of the firm's most critical Linux authentication and security services.

• Take ownership of our identity and access platforms, ensuring they are performant, highly reliable, and secure by design.

• Engineer the seamless and secure integration of new Linux OS distributions into a complex, fast-paced global infrastructure.

• Automate security and infrastructure processes by developing robust, elegant tooling in Python.

• Serve as a subject matter expert, collaborating with brilliant engineers across the firm to solve deep and challenging technical problems.

What you’ll bring:

• A seasoned engineer with 15+ years of experience in systems engineering and infrastructure security.

• Deep, authoritative knowledge of Linux-based operating systems, from the kernel up.

• Proven, hands-on experience in the design and end-to-end implementation of complex authentication and security services. We need builders, not just administrators.

• Expert-level proficiency in the theory and practical application of X.509 PKI, Kerberos, and OAuth/OpenID Connect.

• Demonstrable development experience in Python for the purpose of infrastructure automation and tooling.

• Exceptional troubleshooting capabilities, with the ability to diagnose complex issues at both the host and network level.

• Outstanding communication skills and a collaborative, team-oriented mindset.

Why you should apply:

You will be empowered to make a significant impact on the security and stability of a world-class technology platform. You'll work alongside some of the brightest minds in the industry and have the resources to build things the right way. They value engineering excellence, intellectual curiosity, and a first-principles approach to problem-solving.