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About the Role

We are seeking an experienced offensive security engineer to identify and exploit vulnerabilities across cloud, infrastructure, and application layers. This role involves applying offensive security testing to contain and evaluate frontier AI models, running engagements against our evaluation and research infrastructure, and building agent-assisted red-teaming harnesses. You will collaborate with engineers and research teams, with opportunities to publish and present your work externally.

Responsibilities

Attacking evaluation sandboxes, including container and VM escape, egress controls, and attacking the evaluation host from inside the sandbox.
Finding vulnerabilities in our open-source evaluation framework and supporting infrastructure, and coordinating fixes and disclosure.
Building, operating, and maintaining agent-assisted red-teaming harnesses end to end.
Running agent-assisted harnesses and manual testing against new sandbox and evaluation infrastructure releases.
Triaging and proving findings, separating real issues from noise, and confirming real issues with working exploits.
Comparing agent and human red-teaming effectiveness and feeding learnings back into tooling.
Planning and running scoped engagements against cloud, identity, model-access paths, and research platforms.
Assisting in building and hardening cyber ranges, reviewing evaluation tasks, and providing human baselines.
Scoping and reviewing external penetration tests.
Ensuring model-assisted offensive work adheres to internal safety governance and approval processes.
Publishing research, writing blog posts, and giving talks on sandbox security and AI-assisted offensive work.

Requirements

Substantial hands-on offensive security experience in red teaming, penetration testing, vulnerability research, or exploit development.
Depth in at least two of: cloud and infrastructure (AWS preferred), container/VM/sandbox escape, application security, vulnerability research and exploit development.
Strong Python and/or another language such as Go, Rust, or C, with a track record of writing and maintaining tools.
Experience testing live systems safely.
Clear written and verbal communication skills, including communicating findings that engineers can act on.
Ability to get issues fixed in teams not directly managed.
A serious interest in the direction of frontier AI and motivation to help make it safe.

Skills

Offensive security engineering
Cloud security
Infrastructure security
Application security
Vulnerability research
Exploit development
Red teaming
Penetration testing
Python
Go
Rust
C
Agent-assisted red-teaming harnesses
Linux internals
Kernel security
Hypervisor security
Isolation technologies (Kubernetes, gVisor, Firecracker, Proxmox)
CTF challenge design
Cyber range building
Offensive training content development
Published CVEs
Research publication
Conference talks
Open-source security tools
Coordinated vulnerability disclosure
ML evaluation frameworks
AI/ML platforms
Mentoring engineers
Technical team leadership

Location

London
Birmingham
Cardiff
Darlington
Edinburgh
Salford
Bristol

Work Type

Hybrid working
Occasional remote work abroad

Experience Level

Experienced offensive security engineer
Substantial hands-on offensive security experience

Salary/Compensations

£65,000–£145,000

Benefits

Impact you couldn't have anywhere else
Incredibly talented, mission-driven and supportive colleagues
Direct influence on how frontier AI is governed and deployed globally
Work with the Prime Minister’s AI Advisor and leading AI companies
Opportunity to shape the first & best-resourced public-interest research team focused on AI security
Pre-release access to multiple frontier models and ample compute
Extensive operational support
Work with experts across national security, policy, AI research and adjacent sciences
Own important problems early
5 days off and annual stipends for learning and development
Funding for conferences and external collaborations
Freedom to pursue research bets without product pressure
Opportunities to publish and collaborate externally
Modern central London office
Option to work in similar government offices in Birmingham, Cardiff, Darlington, Edinburgh, Salford or Bristol
Stipends for work-from-home equipment
At least 25 days’ annual leave
8 public holidays
Extra team-wide breaks
3 days off for volunteering
Generous paid parental leave (36 weeks of UK statutory leave shared between parents + 3 extra paid weeks + option for additional unpaid time)
28.97% employer pension contribution on base salary
Discounts and benefits for cycling to work, donations and retail/gyms

About the Company

The AI Security Institute is the world's largest and best-funded team dedicated to understanding advanced AI risks and translating that knowledge into action.
We are in the heart of the UK government with direct lines to No. 10 (the Prime Minister's office), and we work with frontier developers and governments globally.
Governments are critical for advanced AI going well, and UK AISI is uniquely positioned to mobilise them.
With our resources, unique agility and international influence, this is the best place to shape both AI development and government action.
Security Engineering at the AI Security Institute (AISI) protects our people, partners, models, data and the research infrastructure that AISI's work depends on.
We build secure-by-design platforms, automated governance and intelligence-led detection.
We work closely with research units and technology teams so researchers can get on with their work.
We're now building an offensive security team and have three roles available.

Equal Opportunity

The Civil Service embraces diversity and promotes equal opportunities.
We run a Disability Confident Scheme (DCS) for candidates with disabilities who meet the minimum selection criteria.
The Civil Service also offers a Redeployment Interview Scheme to civil servants who are at risk of redundancy, and who meet the minimum requirements for the advertised vacancy.
The Civil Service is committed to attract, retain and invest in talent wherever it is found.
We may be able to offer roles to applicant from any nationality or background.
We encourage you to apply even if you do not meet the standard nationality requirements.