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Senior Security Engineer (Offensive Security)
Our client, a leading quant trading firm ($80bn AUM), is building an in-house AI-driven cyber capability from the ground up. As the lead Offensive Security Engineer, you'll have direct access to serious compute and tooling and will work with decision-makers tasked with driving AI adoption across the trading and technology businesses.
What you'll actually be doing:
- Own and lead offensive engagements: red teaming, penetration testing, adversary emulation, purple team exercises
- Design and build AI-based offensive and defensive tooling — automating recon, exploitation, detection and response
- Lead research into AI/LLM-specific attack techniques: prompt injection, model abuse, agentic exploitation
- Set the technical direction for the team's tooling, frameworks, and automation capability
- Lead threat modelling and security architecture reviews, translating outcomes into engineering roadmaps
- Own AI threat modelling, model risk assessment, and secure AI lifecycle practices from a position of established expertise
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What you'll bring:
- Computer Science and/or Cyber Security degree
- c.10 years in offensive security, with real depth across penetration testing, application security, and software development — not just tooling operation
- A demonstrable track record of building an offensive security capability using AI — this is not a "keen interest," it's proven delivery
- Expert programming skills and a clear understanding of one or more languages (e.g., Python, PowerShell, Go etc.)
- Deep expertise in attack frameworks (MITRE ATT&CK, kill chain)
- Comfortable operating with minimal oversight, setting direction rather than following it
- Track record of successful delivery achieved within complex technology environments with large attack surfaces such as financial trading firms, fintech, or a recognised offensive security consultancy
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Why this one's different:
This is a rare opportunity to build — not maintain — a function at the intersection of offensive security and AI, inside a leading quant trading firm who have the resources and appetite to develop a best-in-class AI-driven security capability.
Compensation and benefits:
Our client offers an extensive compensation and benefits package including a highly competitive "above market" salary and annual bonus, health and wellness package, and hybrid working
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