# Offensive Security Engineer

[Aisi](https://gurify.com/jobs?q=Aisi) · London, United Kingdom · Posted yesterday

[AI & ML](https://gurify.com/jobs/ai-ml)

[Security](https://gurify.com/jobs/security)

[Apply on the original posting → (opens in a new tab)](https://job-boards.eu.greenhouse.io/aisi/jobs/5017631101)

## Job description

### About the AI Security Institute

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’re 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.

We’re here because 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.

### The deadline for applying to this role is Sunday 15th November 2026, end of day, anywhere on Earth.

### About the team

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.

### About the role

We're looking for an experienced offensive security engineer who builds and breaks. You should be able to find and exploit vulnerabilities across cloud, infrastructure and application layers, and want to apply that work to containing and evaluating frontier AI models.

Offensive security testing is one of the key controls behind AISI's model evaluations. You'll run engagements against our evaluation and research infrastructure. That includes the sandboxes, Inspect (our open-source evaluation framework), and the supporting cloud, identity and platform services. Alongside testing, you'll build and own agent-assisted red-teaming harnesses that test this infrastructure continuously.

You'll work directly with the engineers and with research teams on cyber ranges and evaluation tasks, and there's scope to publish and present your work externally.

If you want to attack the systems frontier AI is tested in, use AI agents for offensive work on real targets, and see your findings change how those systems are built, we'd like to hear from you.

### What you'll be doing:

- Attacking evaluation sandboxes. Testing the environments that contain frontier models during evaluations, including container and VM escape, egress controls, and attacking on the evaluation host from inside the sandbox.

- Finding vulnerabilities in Inspect. Finding vulnerabilities in our open-source evaluation framework and the infrastructure around it, and coordinating fixes and disclosure with maintainers and downstream users.

- Building and running agent-assisted harnesses. Building, operating and maintaining agent-assisted red-teaming harnesses end to end. Running them, along with manual testing, against every new sandbox and evaluation infrastructure release before evaluations depend on it.

- Triaging and proving findings. Separating real issues from noise in what the agents find and confirming the real ones with working exploits.

- Comparing agents and humans. Running agent and human red-teaming against the same targets, and feeding what you learn back into the tooling.

- Running wider engagements. Planning and running scoped engagements against our cloud, identity, model-access paths and research platform, including joint exercises with our detection team.

- Working with researchers. Helping to build and harden cyber ranges, reviewing evaluation tasks for realism and scoring, and providing human baselines.

- Managing external testing. Scoping and reviewing external penetration tests.

- Working within governance. Keeping model-assisted offensive work within AISI's internal safety governance and approval processes.

- Sharing your work. Where appropriate, publishing research, writing blog posts and giving talks on sandbox security and AI-assisted offensive work.

### Key competencies:

- Finding and exploiting vulnerabilities in complex, fast-changing systems

- Building tools that make offensive work repeatable

- Judging which findings are real and worth fixing, including findings from AI agents

- Operating safely and accountably under rules of engagement

### Who we're looking for

### Essential experience:

You may be a good fit if you have some of the following skills, experience and attitudes:

- Substantial hands-on offensive security experience in red teaming, penetration testing, vulnerability research or exploit development, with findings you can talk through in depth

- Depth in at least two of:

- cloud and infrastructure (AWS preferred)

- container, VM or sandbox escape

- application security

- vulnerability research and exploit development

- Strong Python and/or another language such as Go, Rust or C, and a track record of writing tools that other people use and that you maintain

- Experience testing live systems safely

- Clear written and verbal communication, including findings that engineers can act on, and the ability to get issues fixed in teams you don't manage

- A serious interest in where frontier AI is heading, and motivation to help make it safe

### Desirable experience:

### We may also consider experience with:

- Building or using LLM agents, for security work

- Linux internals, kernel or hypervisor security, and isolation technologies such as Kubernetes, gVisor, Firecracker or Proxmox

- CTF challenge design, cyber range building or offensive training content

- Published CVEs, research, conference talks or open-source security tools

- Coordinated vulnerability disclosure

- ML evaluation frameworks and AI/ML platforms

- Mentoring other engineers and raising the technical level of a team

We encourage you to apply even if you don't meet every point above. We care more about what you've broken, and how, than about certifications or job titles.

### Selection process

The interview process may vary from candidate to candidate, however, you should expect a typical process to include some technical proficiency tests, discussions with a cross-section of our team at AISI (including non-technical staff) and conversations with your team lead. The process will culminate in a conversation with members of the senior leadership team here at AISI.

Candidates should expect to go through some or all of the following stages once an application has been submitted:

- Initial assessment

- Initial screening call

- Technical assessment

- Research interview

- Behavioural interview

- Final interview with members of the senior leadership team

### Security Clearance

Appointment is conditional on successfully completing UK Government SC clearance. Prior clearance is not required - we will sponsor and support you. You should normally have been resident in the UK for the past 5 years. More detail on clearance eligibility can be found on the UK Government website: National security vetting: clearance levels - GOV.UK.

### What We Offer

### 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.

### Resources & access

- Pre-release access to multiple frontier models and ample compute.

- Extensive operational support so you can focus on research and ship quickly.

- Work with experts across national security, policy, AI research and adjacent sciences.

### Growth & autonomy

- If you’re talented and driven, you’ll own important problems early.

- 5 days off and annual stipends for learning and development, and funding for conferences and external collaborations.

- Freedom to pursue research bets without product pressure.

- Opportunities to publish and collaborate externally.

### Life & family*

- Modern central London office, or where applicable, option to work in similar government offices in Birmingham, Cardiff, Darlington, Edinburgh, Salford or Bristol.

- Hybrid working, flexibility for occasional remote work abroad and stipends for work-from-home equipment.

- At least 25 days’ annual leave, 8 public holidays, extra team-wide breaks and 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).

- On top of your salary, we contribute 28.97% of your base salary to your pension.

- Discounts and benefits for cycling to work, donations and retail/gyms.

*These benefits apply to direct employees. Benefits may differ for individuals joining through other employment arrangements such as secondments.

### Salary

Annual salary is benchmarked to role scope and relevant experience. Most offers land between £65,000 and £145,000 made up of a base salary plus a technical allowance (take-home salary = base + technical allowance). An additional 28.97% employer pension contribution is paid on the base salary.

This role sits outside of the DDaT pay framework given the scope of this role requires in depth technical expertise in frontier AI safety, robustness and advanced AI architectures.

### The full range of salaries are available below:

- Level 3: £65,000–£75,000 (Base £40,850 + Technical Allowance £24,150–£34,150)

- Level 4: £85,000–£95,000 (Base £48,540 + Technical Allowance £36,460–£46,460)

- Level 5: £105,000–£115,000 (Base £63,165 + Technical Allowance £41,835–£51,835)

- Level 6: £125,000–£135,000 (Base £76,475 + Technical Allowance £48,525–£58,525)

- Level 7: £145,000 (Base £76,475 + Technical Allowance £68,525)

### Additional Information

### Use of AI in Applications

Artificial Intelligence can be a useful tool to support your application, however, all examples and statements provided must be truthful, factually accurate and taken directly from your own

**Live in Aisi’s hiring system.** Read from the company's own applicant tracking system, not reposted from a job board — so it's a real, open requisition rather than an ad that outlived the role.

We remove it as soon as it disappears at source.

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```json
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With our resources, unique agility and international influence, this is the best place to shape both AI development and government action.\u003C/p\u003E\u003Ch3\u003EThe deadline for applying to this role is Sunday 15th November 2026, end of day, anywhere on Earth.\u003C/h3\u003E\u003Ch3\u003EAbout the team\u003C/h3\u003E\u003Cp\u003ESecurity Engineering at the AI Security Institute (AISI) protects our people, partners, models, data and the research infrastructure that AISI\u0026#39;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.\u003C/p\u003E\u003Cp\u003EWe\u0026#39;re now building an offensive security team and have three roles available.\u003C/p\u003E\u003Ch3\u003EAbout the role\u003C/h3\u003E\u003Cp\u003EWe\u0026#39;re looking for an experienced offensive security engineer who builds and breaks. 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Finding vulnerabilities in our open-source evaluation framework and the infrastructure around it, and coordinating fixes and disclosure with maintainers and downstream users.\u003C/li\u003E\u003C/ul\u003E\u003Cul\u003E\u003Cli\u003EBuilding and running agent-assisted harnesses. Building, operating and maintaining agent-assisted red-teaming harnesses end to end. Running them, along with manual testing, against every new sandbox and evaluation infrastructure release before evaluations depend on it.\u003C/li\u003E\u003C/ul\u003E\u003Cul\u003E\u003Cli\u003ETriaging and proving findings. Separating real issues from noise in what the agents find and confirming the real ones with working exploits.\u003C/li\u003E\u003C/ul\u003E\u003Cul\u003E\u003Cli\u003EComparing agents and humans. Running agent and human red-teaming against the same targets, and feeding what you learn back into the tooling.\u003C/li\u003E\u003C/ul\u003E\u003Cul\u003E\u003Cli\u003ERunning wider engagements. Planning and running scoped engagements against our cloud, identity, model-access paths and research platform, including joint exercises with our detection team.\u003C/li\u003E\u003C/ul\u003E\u003Cul\u003E\u003Cli\u003EWorking with researchers. Helping to build and harden cyber ranges, reviewing evaluation tasks for realism and scoring, and providing human baselines.\u003C/li\u003E\u003C/ul\u003E\u003Cul\u003E\u003Cli\u003EManaging external testing. Scoping and reviewing external penetration tests.\u003C/li\u003E\u003C/ul\u003E\u003Cul\u003E\u003Cli\u003EWorking within governance. Keeping model-assisted offensive work within AISI\u0026#39;s internal safety governance and approval processes.\u003C/li\u003E\u003C/ul\u003E\u003Cul\u003E\u003Cli\u003ESharing your work. Where appropriate, publishing research, writing blog posts and giving talks on sandbox security and AI-assisted offensive work.\u003C/li\u003E\u003C/ul\u003E\u003Ch3\u003EKey competencies:\u003C/h3\u003E\u003Cul\u003E\u003Cli\u003EFinding and exploiting vulnerabilities in complex, fast-changing systems\u003C/li\u003E\u003C/ul\u003E\u003Cul\u003E\u003Cli\u003EBuilding tools that make offensive work repeatable\u003C/li\u003E\u003C/ul\u003E\u003Cul\u003E\u003Cli\u003EJudging which findings are real and worth fixing, including findings from AI agents\u003C/li\u003E\u003C/ul\u003E\u003Cul\u003E\u003Cli\u003EOperating safely and accountably under rules of engagement\u003C/li\u003E\u003C/ul\u003E\u003Ch3\u003EWho we\u0026#39;re looking for\u003C/h3\u003E\u003Ch3\u003EEssential experience:\u003C/h3\u003E\u003Cp\u003EYou may be a good fit if you have some of the following skills, experience and attitudes:\u003C/p\u003E\u003Cul\u003E\u003Cli\u003ESubstantial hands-on offensive security experience in red teaming, penetration testing, vulnerability research or exploit development, with findings you can talk through in depth\u003C/li\u003E\u003C/ul\u003E\u003Cul\u003E\u003Cli\u003EDepth in at least two of:\u003C/li\u003E\u003C/ul\u003E\u003Cul\u003E\u003Cli\u003Ecloud and infrastructure (AWS preferred)\u003C/li\u003E\u003C/ul\u003E\u003Cul\u003E\u003Cli\u003Econtainer, VM or sandbox escape\u003C/li\u003E\u003C/ul\u003E\u003Cul\u003E\u003Cli\u003Eapplication security\u003C/li\u003E\u003C/ul\u003E\u003Cul\u003E\u003Cli\u003Evulnerability research and exploit development\u003C/li\u003E\u003C/ul\u003E\u003Cul\u003E\u003Cli\u003EStrong Python and/or another language such as Go, Rust or C, and a track record of writing tools that other people use and that you maintain\u003C/li\u003E\u003C/ul\u003E\u003Cul\u003E\u003Cli\u003EExperience testing live systems safely\u003C/li\u003E\u003C/ul\u003E\u003Cul\u003E\u003Cli\u003EClear written and verbal communication, including findings that engineers can act on, and the ability to get issues fixed in teams you don\u0026#39;t manage\u003C/li\u003E\u003C/ul\u003E\u003Cul\u003E\u003Cli\u003EA serious interest in where frontier AI is heading, and motivation to help make it safe\u003C/li\u003E\u003C/ul\u003E\u003Ch3\u003EDesirable experience:\u003C/h3\u003E\u003Ch3\u003EWe may also consider experience with:\u003C/h3\u003E\u003Cul\u003E\u003Cli\u003EBuilding or using LLM agents, for security work\u003C/li\u003E\u003C/ul\u003E\u003Cul\u003E\u003Cli\u003ELinux internals, kernel or hypervisor security, and isolation technologies such as Kubernetes, gVisor, Firecracker or Proxmox\u003C/li\u003E\u003C/ul\u003E\u003Cul\u003E\u003Cli\u003ECTF challenge design, cyber range building or offensive training content\u003C/li\u003E\u003C/ul\u003E\u003Cul\u003E\u003Cli\u003EPublished CVEs, research, conference talks or open-source security tools\u003C/li\u003E\u003C/ul\u003E\u003Cul\u003E\u003Cli\u003ECoordinated vulnerability disclosure\u003C/li\u003E\u003C/ul\u003E\u003Cul\u003E\u003Cli\u003EML evaluation frameworks and AI/ML platforms\u003C/li\u003E\u003C/ul\u003E\u003Cul\u003E\u003Cli\u003EMentoring other engineers and raising the technical level of a team\u003C/li\u003E\u003C/ul\u003E\u003Cp\u003EWe encourage you to apply even if you don\u0026#39;t meet every point above. We care more about what you\u0026#39;ve broken, and how, than about certifications or job titles.\u003C/p\u003E\u003Ch3\u003ESelection process\u003C/h3\u003E\u003Cp\u003EThe interview process may vary from candidate to\u202Fcandidate,\u202Fhowever, you should expect a typical process to include some technical\u202Fproficiency\u202Ftests, discussions with a cross-section of our team at AISI (including non-technical staff) and conversations with your team lead. The process will culminate in a conversation with members of the senior leadership team here at AISI.\u003C/p\u003E\u003Cp\u003ECandidates should expect to go through\u202Fsome or\u202Fall of\u202Fthe following stages once an application has been\u202Fsubmitted:\u003C/p\u003E\u003Cul\u003E\u003Cli\u003EInitial assessment\u003C/li\u003E\u003C/ul\u003E\u003Cul\u003E\u003Cli\u003EInitial screening call\u003C/li\u003E\u003C/ul\u003E\u003Cul\u003E\u003Cli\u003ETechnical assessment\u003C/li\u003E\u003C/ul\u003E\u003Cul\u003E\u003Cli\u003EResearch interview\u003C/li\u003E\u003C/ul\u003E\u003Cul\u003E\u003Cli\u003EBehavioural interview\u003C/li\u003E\u003C/ul\u003E\u003Cul\u003E\u003Cli\u003EFinal interview with members of the senior leadership team\u003C/li\u003E\u003C/ul\u003E\u003Ch3\u003ESecurity Clearance\u003C/h3\u003E\u003Cp\u003EAppointment is conditional on successfully completing UK Government SC clearance. Prior clearance is not required - we will sponsor and support you. You should normally have been resident in the UK for the past 5 years. More detail on clearance eligibility can be found on the UK Government website: National security vetting: clearance levels - GOV.UK.\u003C/p\u003E\u003Ch3\u003EWhat We Offer\u003C/h3\u003E\u003Ch3\u003EImpact you couldn\u0026#39;t have anywhere else\u003C/h3\u003E\u003Cul\u003E\u003Cli\u003EIncredibly talented, mission-driven and supportive colleagues.\u003C/li\u003E\u003C/ul\u003E\u003Cul\u003E\u003Cli\u003EDirect influence on how frontier AI is governed and deployed globally.\u003C/li\u003E\u003C/ul\u003E\u003Cul\u003E\u003Cli\u003EWork with the Prime Minister\u2019s AI Advisor and leading AI companies.\u003C/li\u003E\u003C/ul\u003E\u003Cul\u003E\u003Cli\u003EOpportunity to shape the first \u0026amp; best-resourced public-interest research team focused on AI security.\u003C/li\u003E\u003C/ul\u003E\u003Ch3\u003EResources \u0026amp; access\u003C/h3\u003E\u003Cul\u003E\u003Cli\u003EPre-release access to multiple frontier models and ample compute.\u003C/li\u003E\u003C/ul\u003E\u003Cul\u003E\u003Cli\u003EExtensive operational support so you can focus on research and ship quickly.\u003C/li\u003E\u003C/ul\u003E\u003Cul\u003E\u003Cli\u003EWork with experts across national security, policy, AI research and adjacent sciences.\u003C/li\u003E\u003C/ul\u003E\u003Ch3\u003EGrowth \u0026amp; autonomy\u003C/h3\u003E\u003Cul\u003E\u003Cli\u003EIf you\u2019re talented and driven, you\u2019ll own important problems early.\u003C/li\u003E\u003C/ul\u003E\u003Cul\u003E\u003Cli\u003E5 days off and annual stipends for learning and development, and funding for conferences and external collaborations.\u003C/li\u003E\u003C/ul\u003E\u003Cul\u003E\u003Cli\u003EFreedom to pursue research bets without product pressure.\u003C/li\u003E\u003C/ul\u003E\u003Cul\u003E\u003Cli\u003EOpportunities to publish and collaborate externally.\u003C/li\u003E\u003C/ul\u003E\u003Ch3\u003ELife \u0026amp; family*\u003C/h3\u003E\u003Cul\u003E\u003Cli\u003EModern central London office, or where applicable, option to work in similar government offices in Birmingham, Cardiff, Darlington, Edinburgh, Salford or Bristol.\u003C/li\u003E\u003C/ul\u003E\u003Cul\u003E\u003Cli\u003EHybrid working, flexibility for occasional remote work abroad and stipends for work-from-home equipment.\u003C/li\u003E\u003C/ul\u003E\u003Cul\u003E\u003Cli\u003EAt least 25 days\u2019 annual leave, 8 public holidays, extra team-wide breaks and 3 days off for volunteering.\u003C/li\u003E\u003C/ul\u003E\u003Cul\u003E\u003Cli\u003EGenerous paid parental leave (36 weeks of UK statutory leave shared between parents \u002B 3 extra paid weeks \u002B option for additional unpaid time).\u003C/li\u003E\u003C/ul\u003E\u003Cul\u003E\u003Cli\u003EOn top of your salary, we contribute 28.97% of your base salary to your pension.\u003C/li\u003E\u003C/ul\u003E\u003Cul\u003E\u003Cli\u003EDiscounts and benefits for cycling to work, donations and retail/gyms.\u003C/li\u003E\u003C/ul\u003E\u003Cp\u003E*These benefits apply to direct employees. Benefits may differ for individuals joining through other employment arrangements such as secondments.\u003C/p\u003E\u003Ch3\u003ESalary\u003C/h3\u003E\u003Cp\u003EAnnual salary is benchmarked to role scope and relevant experience. Most offers land between \u0026#163;65,000 and \u0026#163;145,000 made up of a base salary plus a technical allowance (take-home salary = base \u002B technical allowance). An additional 28.97% employer pension contribution is paid on the base salary.\u003C/p\u003E\u003Cp\u003EThis role sits outside of the DDaT pay framework given the scope of this role requires in depth technical expertise in frontier AI safety, robustness and advanced AI architectures.\u003C/p\u003E\u003Ch3\u003EThe full range of salaries are available below:\u003C/h3\u003E\u003Cul\u003E\u003Cli\u003ELevel 3: \u0026#163;65,000\u2013\u0026#163;75,000 (Base \u0026#163;40,850 \u002B Technical Allowance \u0026#163;24,150\u2013\u0026#163;34,150)\u003C/li\u003E\u003C/ul\u003E\u003Cul\u003E\u003Cli\u003ELevel 4: \u0026#163;85,000\u2013\u0026#163;95,000 (Base \u0026#163;48,540 \u002B Technical Allowance \u0026#163;36,460\u2013\u0026#163;46,460)\u003C/li\u003E\u003C/ul\u003E\u003Cul\u003E\u003Cli\u003ELevel 5: \u0026#163;105,000\u2013\u0026#163;115,000 (Base \u0026#163;63,165 \u002B Technical Allowance \u0026#163;41,835\u2013\u0026#163;51,835)\u003C/li\u003E\u003C/ul\u003E\u003Cul\u003E\u003Cli\u003ELevel 6: \u0026#163;125,000\u2013\u0026#163;135,000 (Base \u0026#163;76,475 \u002B Technical Allowance \u0026#163;48,525\u2013\u0026#163;58,525)\u003C/li\u003E\u003C/ul\u003E\u003Cul\u003E\u003Cli\u003ELevel 7: \u0026#163;145,000 (Base \u0026#163;76,475 \u002B Technical Allowance \u0026#163;68,525)\u003C/li\u003E\u003C/ul\u003E\u003Ch3\u003EAdditional Information\u003C/h3\u003E\u003Ch3\u003EUse of AI in Applications\u003C/h3\u003E\u003Cp\u003EArtificial Intelligence can be a useful tool to support your application, however, all examples and statements provided must be truthful, factually accurate and taken directly from your own\u003C/p\u003E","identifier":{"@type":"PropertyValue","name":"Gurify","value":"offensive-security-engineer-at-aisi-74c6bb63a203"},"url":"https://gurify.com/job/offensive-security-engineer-at-aisi-74c6bb63a203","datePosted":"2026-10-27","validThrough":"2026-12-12T23:59:59Z","hiringOrganization":{"@type":"Organization","name":"Aisi","sameAs":"https://job-boards.eu.greenhouse.io/aisi"},"directApply":false,"jobLocation":{"@type":"Place","address":{"@type":"PostalAddress","addressCountry":"GB","addressLocality":"London"}}}
```

```json
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```