Systems Security Engineer
Job Description
[Up to c. $400k Comp Package (or equivalent) | Office-Led Working]
Role Overview
Our client, a world-leading quantitative trading firm, is looking for an exceptionally technical Systems Security Engineer to work alongside its software, infrastructure and systems engineering teams.
This is a deeply technical consultancy position for an engineer who can act as the security specialist within highly capable engineering teams. You will work closely with engineers building complex production systems, helping them understand how those systems can fail from a security perspective and ensuring products and platforms are designed securely from the outset. The role is focused on understanding production environments at a fundamental level, identifying architectural and systems-level security weaknesses, and helping engineers build systems that are secure by default. You will apply threat modelling, architectural analysis and red-team methodologies across Linux-based production systems, backend services, infrastructure and distributed environments.
This is not a conventional application security, penetration testing or advisory role. The focus is broader than identifying individual vulnerabilities such as XSS or CSRF. You will reason about trust boundaries, privilege, system interactions, attack paths and architectural assumptions, considering how security decisions affect the wider production environment...
Key Responsibilities
- Act as the security specialist alongside software, platform, infrastructure and systems engineers, providing highly technical consultancy throughout the engineering lifecycle
- Work closely with engineering teams to understand how complex production systems are designed, deployed and operated, helping ensure they are built securely from the outset
- Perform detailed threat modelling across architectures, identifying trust boundaries, attack surfaces, unsafe assumptions and credible paths to compromise
- Apply product-security and red-team methodologies to challenge system designs, workflows and engineering assumptions before weaknesses become embedded in production
- Assess security at the operating-system and system-boundary level, including privilege, authentication, process isolation, networking and interactions between components
- Guide engineering teams towards secure-by-default architectural patterns while balancing security, reliability, performance and usability
- Evaluate security risks across operating systems, backend services, infrastructure components and interconnected production environments, turning analysis into clear, implementable engineering recommendations
- Help define reusable security principles, technical standards and guidance that improve security decision-making consistently across engineering teams
What You’ll Bring...
- Approximately 6–10 years of experience spanning systems engineering, security engineering, infrastructure, production engineering or another deeply technical engineering discipline
- Strong practical knowledge of Linux and production systems, including confidence working at the command line and understanding operating-system behaviour beneath the application layer
- Solid software or systems engineering foundations, with meaningful programming experience in a language such as Python, C, C++, Go, Rust or equivalent
- Proven ability to analyse complex architectures and reason about security across system interactions, dependencies, trust relationships, privilege boundaries and credible attack paths
- Practical experience acting as the security specialist within software, systems, platform or infrastructure engineering teams, influencing technical decisions through engineering expertise
- Experience with threat modelling, security architecture, secure systems design, adversarial analysis, red-team methodologies or another comparable engineering-led security discipline
- Strong fundamentals across operating systems, networking, distributed systems and backend architecture, with familiarity with CI/CD and modern engineering tooling
- Experience securing systems at the operating-system, infrastructure, backend or architectural level rather than focusing predominantly on individual web-application vulnerabilities
...
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