Platform Security Lead - Infrastructure & Identity Security
Job Description
[Up to c. $325k Comp Package | Hybrid Working]
Role Overview
We’re representing a technology-led proprietary trading and investment firm operating across global markets. The business combines quantitative research, software engineering and sophisticated infrastructure to support trading activity at scale, with a culture that places heavy value on technical depth, collaboration and practical problem-solving.
This is a hands-on leadership role within Platform Security, focused on protecting the core systems that underpin the firm’s global technology environment. You’ll lead a small team while remaining close to engineering delivery across identity, endpoint, server, operating system and emerging AI platform security. The role is well suited to someone who can set direction, mentor strong engineers and still engage directly with complex technical problems...
Key Responsibilities
- Guide the day-to-day technical work of a platform security group responsible for foundational infrastructure and enterprise systems
- Shape the roadmap for securing identity platforms, endpoint estates, server environments and newer infrastructure services
- Improve defensive controls across mixed operating system environments, including Windows, Linux and macOS
- Work closely with infrastructure and engineering teams to turn security requirements into practical, scalable implementations
- Strengthen access control and directory security across enterprise identity platforms such as Active Directory and Entra ID
- Create tooling, automation and repeatable workflows that improve security outcomes without adding unnecessary friction
- Establish pragmatic security patterns that help engineering teams move quickly while reducing platform-level risk
- Stay hands-on across architecture reviews, incident support, troubleshooting and complex technical delivery
- Contribute to security strategy around cloud platforms, AI-adjacent infrastructure and other evolving technology areas
- Help mature the platform security function into a proactive engineering capability focused on long-term resilience
What You’ll Bring…
- 8-14 years’ experience across platform security, infrastructure security, systems engineering or related technical security roles
- Proven experience leading security engineers or driving complex cross-functional security initiatives
- Strong background securing mixed operating system environments across Windows, Linux and macOS
- Deep understanding of identity and access management, including Active Directory, Entra ID and privileged access concepts
- Experience building internal security tooling or automation
- Experience with endpoint, server and infrastructure security tooling
- Strong systems, networking and infrastructure fundamentals
- Exposure to cloud security, AI platform security or modern infrastructure security environments
- Hands-on engineering mindset, with the ability to design, build and automate security improvements
- Ability to influence engineering and infrastructure teams without slowing delivery
- Strong communication skills and the judgement to balance security, reliability and developer productivity
- (Preferred) Background in trading, financial technology, large-scale engineering or similarly demanding technical environments
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