Principal Vulnerability Engineer

Xact Placements Limited
London, United Kingdom
Last month
£100,000 – £110,000 pa

Salary

£100,000 – £110,000 pa

Job Type
Permanent
Work Pattern
Full-time
Work Location
Remote
Seniority
Lead
Posted
1 May 2026 (Last month)

Benefits

Benefits

Principal Vulnerability Engineer | High-Growth Cybersecurity Scale-Up | Fully Remote (UK)

  • Remote – UK Based
  • Up to £110,000 + benefits
  • Permanent – Full time

Got a track record of 0-day discoveries, public CVEs, and a reputation for finding bugs that actually move the needle?

Join a research-driven, venture-backed cybersecurity scale-up trusted by Fortune 500 enterprises and critical infrastructure providers. Recognised by Gartner, $29M funded, and scaling fast worldwide.

As aPrincipal Vulnerability Engineer, you’ll own the full vulnerability lifecycle – from discovery, through detection, to deployment – building production-grade tooling and pioneering LLM-powered offensive security workflows.

What you’ll be doing:

  • Leading deep research across0-days and n-days, with patch diffing across source-available and binary-only targets
  • Designing tooling for automated vulnerability discovery, exploit validation, and detection signature generation
  • Architecting production-grade,LLM-powered research workflows
  • Focusing on thevulnerabilities that matter – RCEs, auth bypasses, the bugs that change a client’s risk posture overnight

What they’re looking for:

  • 5+ years of mixedvulnerability research and software engineering experience
  • A demonstrable track record oforiginal 0-day discovery – public advisories, CVEs, or equivalent
  • Deep n-day research andpatch diffing chops
  • Confidence across bothweb and binary vulnerability classes
  • Production-grade software engineering experience, ideally inPython
  • Mastery ofBurp Suite, Ghidra/IDA, debuggers, fuzzers
  • Hands-on experience usingLLMs in research workflows

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