Principal Vulnerability Engineer

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

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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

Industry Insights

Discover insightful articles, industry insights, expert tips, and curated resources.

Where to Advertise Cyber Security Jobs in the UK (2026 Guide)

Where to advertise cyber security jobs UK in 2026: the specialist boards, communities and channels that reach offensive, defensive and GRC security talent. The candidate pool is small, heavily vetted and in high demand across government, financial services, critical national infrastructure and the private sector simultaneously. Many of the strongest candidates hold active security clearances, are not actively job-searching through general platforms, and move primarily through specialist networks and trusted referrals. General job boards reach a broad audience but lack the specificity that security professionals expect. Specialist platforms, government-affiliated channels and cleared candidate networks each serve a different part of the market. This guide, published by CybersecurityJobs.tech, covers where to advertise cyber security roles in the UK in 2026, how the main platforms compare, what employers should expect to pay, and what the data says about hiring across different role types.