{"id":3339530,"url":"https://alion.io/job/refractal-security-engineer-ai-red-team","title":"Security Engineer (AI Red Team)","company":{"id":4403779,"name":"Refractal","domain":"refractal-ai.com","url":"https://alion.io/company/refractal","size_band":"501-1000","is_staffing_agency":false,"employer_type":"direct","is_intermediary":false,"listed_via":null,"ats_vendor":"Ashby","truth_index":null},"role":"Security","role_family":"Security","seniority":null,"employment_type":"full_time","work_mode":"on_site","remote_scope":null,"remote_scope_basis":null,"remote_working_hours":null,"hiring_geo_confidence":"structured","locations":["London, United Kingdom"],"countries":["GB"],"hiring_countries":[],"hiring_countries_total":0,"salary":{"min":65000,"max":125000,"currency":"GBP","period":"year","gross":null,"usd_annual":166960},"salary_estimate":null,"experience_years_min":null,"visa_sponsorship":false,"relocation_package":false,"has_equity":false,"technologies":[{"name":"LLM","optional":true}],"status":"live","first_seen_at":"2026-10-08T13:30:51Z","employer_posted_date":"2026-10-08","last_verified_at":"2026-10-29T07:10:21Z","board_verified":true,"closed_at":null,"days_open":20,"trust":{"level":"ok","repost_count":null,"flags":[],"days_open":20},"description":"About Refractal\nRefractal is an AI security company building the infrastructure organisations need to defend against autonomous AI threats. 2026 has shown that generally capable intelligence is here. The challenge now is modernising security to stop AI-enabled threats, whether they come from internal agents going rogue or from attackers using AI to become more dangerous.\nRefractal was founded on cybersecurity and AI expertise from MIT, Microsoft, NASA and the U.S. Navy. Our product lets organisations detect AI-enabled threats at low cost without sacrificing detection quality. We take a practical approach to AI risk, combining proven cybersecurity methods with frontier AI security research.\nToday, we work with governments and organisations that can't afford to get security wrong. We're backed by leading deep-tech and cybersecurity investors and are growing the team to deliver on this mission.\nThe role\nYou'll test how deployed AI systems and agents fail under adversarial pressure. You'll run authorised, controlled security assessments, show what each finding means in practice, and work with our engineering and research teams to turn findings into stronger defences and repeatable tests.\nWhat you'll do\nDesign and execute assessments of AI applications and agents, grounded in realistic attacker goals and clearly defined test scope.\n\nTest realistic threats such as indirect prompt injection, misuse of connected tools, sensitive data exposure and attempts to cross permission boundaries.\n\nBuild reproducible test cases and small testing tools that demonstrate security impact and distinguish reliable failures from one-off outputs.\n\nAnalyse how model behaviour, application design, identity and permissions combine to create vulnerabilities.\n\nDocument findings, recommend practical mitigations and retest fixes with the engineers responsible for the affected systems.\n\nSuccess in your first six months\nYou've established a repeatable assessment approach that connects realistic adversaries, test scenarios and security outcomes.\n\nYou've produced actionable findings with reproducible evidence and helped validate the resulting fixes.\n\nYou've built a growing set of regression tests that captures recurring failure modes and checks whether fixes hold.\n\nAbout you: essential\nHands-on experience in offensive security, application security testing or adversarial testing of AI systems.\n\nA solid understanding of web applications, APIs, authentication, authorisation and common security failure modes.\n\nAn understanding of how AI applications use prompts, retrieved information, memory and connected tools, and where trust boundaries arise.\n\nThe ability to write code that automates testing, reproduces findings and inspects application behaviour.\n\nGood judgement around test scope and sensitive data, and the ability to explain technical findings in terms of practical impact.\n\nNice to have\nExperience assessing LLM applications, agent workflows or systems that retrieve external content.\n\nExperience building security evaluation suites or testing proposed mitigations systematically.\n\nExperience combining application testing with cloud, identity or infrastructure security assessment.\n\nOur values\nRadical transparency. We believe the best work happens when everyone feels able to give and receive honest, constructive feedback.\nPublic service. We see AI security as a form of public service. Getting the AI transition right means putting the right infrastructure in place to manage the threats that come with it, and our work helps protect the institutions and services society depends on.\nFail fast. We test ideas early, seek feedback and learn quickly. We experiment rapidly and change course when something isn't working, without compromising on security.\nPragmatism, not dogmatism. We choose approaches based on how well they solve the problem. That means combining established cybersecurity methods with frontier AI research, questioning our assumptions, and changing our minds when the evidence changes.\nCompensation and benefits\nSalary: £65,000-£125,000\n\nCompetitive equity to share in Refractal's growth\n\nPension contribution\n\nPrivate medical and dental cover\n\nVisa and relocation support","description_format":"text","description_chars":4211,"description_truncated":false,"requirements":{"experience_years_min":null,"management_years_min":null,"team_size_min":null,"manages_managers":false,"education":null,"security_clearance":false,"languages":[]},"benefits":["Equity"],"hiring_locations":[],"hiring_excludes":[],"relocation_offered":true,"industries":["Artificial Intelligence","Penetration Testing","Information Security","Cybersecurity AI"],"lifecycle":[{"event":"open","at":"2026-10-27T15:00:00Z"}],"visa":[],"liveness":{"score":60,"band":"ok","label":"Likely open","p_open":1,"p_active":0.796,"p_room":0.75,"age_days":20,"expected_fill_days":26,"reasons":["conf:2","velocity","win:late"],"computed_at":"2026-10-29T05:49:05Z"},"pay":{"stated_usd_annual":166960,"is_top_pay":true},"html_url":"https://alion.io/job/refractal-security-engineer-ai-red-team","json_url":"https://alion.io/job/refractal-security-engineer-ai-red-team.json","meta":{"generated_at":"2026-10-29T08:08:24Z","cache_seconds":300,"methodology":"https://alion.io/methodology","terms":"https://alion.io/terms","contact":"https://alion.io/contact","api":"https://alion.io/developers","about":"Alion is a live layer of people, companies and AI agents: who they are, whether they are real and active right now, what they do and how to work with them, readable by people and by agents and paid per call.","catalog":"https://alion.io/catalog.json","usage":{"tier":"crawler_verified","counted_by":"address","units_charged":1,"used_today":12473,"day_limit":null,"remaining_today":null,"minute_limit":300,"resets_at":"2026-10-30T00:00:00Z"}},"offers":[{"id":"company.slices","title":"One company in depth, by slice","status":"live","price":{"credits":0.02,"usd":0.002,"plus_per_slice":{"credits":0.05,"usd":0.005}},"unit":"per company, plus each slice with data","note":"the employer in depth","call":{"mcp_tool":"get_company","arguments":{"id":4403779},"rest":"https://alion.io/mcp/rest/get_company?id=4403779"},"human":"https://alion.io/catalog?offer=company.slices&for=job%2Frefractal-security-engineer-ai-red-team"},{"id":"market.stats","title":"A market slice: pay, demand and time to fill","status":"live","price":{"credits":1,"usd":0.1},"unit":"per slice","note":"pay, demand and time to fill for this role and place","call":{"mcp_tool":"market_stats"},"human":"https://alion.io/catalog?offer=market.stats&for=job%2Frefractal-security-engineer-ai-red-team"},{"id":"job.search","title":"Open jobs by role, technology, place, pay and visa","status":"live","price":{"credits":0.02,"usd":0.002},"unit":"per posting in a list","note":"similar open postings","call":{"mcp_tool":"search_jobs"},"human":"https://alion.io/catalog?offer=job.search&for=job%2Frefractal-security-engineer-ai-red-team"},{"id":"company.verify","title":"Is this company real and active right now","status":"pilot","price":null,"unit":"per company","request":{"url":"https://alion.io/catalog/request","method":"POST","body":"{\"offer\": \"company.verify\", \"for\": \"job/refractal-security-engineer-ai-red-team\", \"note\": \"what you need it for\"}"},"human":"https://alion.io/catalog?offer=company.verify&for=job%2Frefractal-security-engineer-ai-red-team"}],"agent":{"mcp":"https://alion.io/mcp/jobs","mcp_open":"https://alion.io/mcp/open","next":[{"tool":"get_job","arguments":{"id":3339530}},{"tool":"search_jobs","arguments":{"company":"refractal-ai.com","detail":"compact"}},{"tool":"match_people","arguments":{"job_id":3339530},"note":"people open to offers who fit this vacancy"}],"note":"The same data through MCP tools: https://alion.io/mcp/open needs no sign-in (compact searches, postings, people); https://alion.io/mcp with an Alion account has everything. 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