{"id":3339532,"url":"https://alion.io/job/refractal-senior-data-engineer-2","title":"Senior Data Engineer","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":"Data Science","role_family":"Data Science","seniority":"senior","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":80000,"max":135000,"currency":"GBP","period":"year","gross":null,"usd_annual":180317},"salary_estimate":null,"experience_years_min":6,"visa_sponsorship":false,"relocation_package":false,"has_equity":false,"technologies":[{"name":"Apache Kafka","optional":false},{"name":"ClickHouse","optional":false},{"name":"Dagster","optional":false},{"name":"EU AI Act","optional":false},{"name":"Google BigQuery","optional":false},{"name":"NIST AI RMF","optional":false},{"name":"PostgreSQL","optional":false},{"name":"Python","optional":false},{"name":"SQL","optional":false},{"name":"GDPR","optional":true}],"status":"live","first_seen_at":"2026-10-08T13:30:49Z","employer_posted_date":"2026-10-08","last_verified_at":"2026-10-28T05:14:53Z","board_verified":true,"closed_at":null,"days_open":19,"trust":{"level":"ok","repost_count":null,"flags":[],"days_open":19},"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 build Refractal's data foundation, including the evidence store that customers' auditors rely on, the analytics behind compliance reporting and the datasets our models are trained on.\nWhat you'll do\nDesign the data model for our append-only, cryptographically signed evidence store.\n\nBuild the streaming and batch layer that turns ingested activity and detections into queryable data, working with our integrations engineers on schemas.\n\nOwn data quality, retention, residency and deletion controls for regulated customers.\n\nBuild training and evaluation datasets with our data scientists and security engineers.\n\nMake compliance reporting against the EU AI Act, NIST AI RMF and ISO/IEC 42001 quick to produce from our data.\n\nSuccess in your first six months\nThe evidence store is in production, documented and trusted by customers' auditors.\n\nColleagues answer compliance and detection questions from data you own, without ad hoc work.\n\nTraining and evaluation data has clear provenance and separation.\n\nAbout you: essential\n6+ years in data engineering, owning production pipelines.\n\nStrong Python and SQL, with Postgres plus a warehouse or analytics store such as BigQuery or ClickHouse.\n\nExperience with streaming (Kafka, Pub/Sub or similar) and orchestration (Airflow, Dagster or similar).\n\nData modelling for audit trails, lineage and multi-tenant isolation.\n\nSecurity-minded handling of sensitive data.\n\nNice to have\nData work in banking, insurance or other regulated industries.\n\nExperience with UK GDPR and data residency.\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: £80,000-£135,000\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":3464,"description_truncated":false,"requirements":{"experience_years_min":6,"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","Cybersecurity","Information Security","Cybersecurity AI"],"lifecycle":[{"event":"open","at":"2026-10-27T15:00:00Z"}],"visa":[],"liveness":{"score":74,"band":"hot","label":"Hiring now","p_open":1,"p_active":0.822,"p_room":0.9,"age_days":19,"expected_fill_days":35,"reasons":["conf:0","win:mid"],"computed_at":"2026-10-28T05:59:10Z"},"pay":{"stated_usd_annual":180317,"is_top_pay":true},"html_url":"https://alion.io/job/refractal-senior-data-engineer-2","json_url":"https://alion.io/job/refractal-senior-data-engineer-2.json","meta":{"generated_at":"2026-10-28T08:04:29Z","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":10401,"day_limit":null,"remaining_today":null,"minute_limit":300,"resets_at":"2026-10-29T00:00:00Z"}},"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-senior-data-engineer-2"},{"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-senior-data-engineer-2"},{"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-senior-data-engineer-2"},{"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-senior-data-engineer-2\", \"note\": \"what you need it for\"}"},"human":"https://alion.io/catalog?offer=company.verify&for=job%2Frefractal-senior-data-engineer-2"}],"agent":{"mcp":"https://alion.io/mcp/jobs","mcp_open":"https://alion.io/mcp/open","next":[{"tool":"get_job","arguments":{"id":3339532}},{"tool":"search_jobs","arguments":{"company":"refractal-ai.com","detail":"compact"}},{"tool":"match_people","arguments":{"job_id":3339532},"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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