{"id":1769968,"url":"https://alion.io/job/reflexivity-machine-learning-and-ai-engineer-london","title":"Machine Learning and AI Engineer - London","company":{"id":2241328,"name":"Reflexivity","domain":"reflexivity.com","url":"https://alion.io/company/reflexivity-com","size_band":"51-200","is_staffing_agency":false,"employer_type":"direct","is_intermediary":false,"listed_via":null,"ats_vendor":"FirstStage","truth_index":{"grade":"B","score":75,"open_postings":7,"ghost_share":0,"stale_share":1,"repost_share":0,"time_to_fill_p50_days":null,"computed_at":"2026-10-12T06:55:09Z"}},"role":"AI/ML","role_family":"AI/ML","seniority":"senior","employment_type":null,"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":90000,"max":160000,"currency":"GBP","period":"year","gross":null,"usd_annual":211955},"salary_estimate":null,"experience_years_min":5,"visa_sponsorship":false,"relocation_package":false,"has_equity":false,"technologies":[{"name":"Anthropic","optional":false},{"name":"Claude Code","optional":false},{"name":"Cursor","optional":false},{"name":"Gemini","optional":false},{"name":"Go","optional":false},{"name":"LLM","optional":false},{"name":"OpenAI","optional":false},{"name":"Python","optional":false},{"name":"Knowledge Graph","optional":true}],"status":"live","first_seen_at":"2025-11-25T14:51:39Z","employer_posted_date":"2025-11-25","last_verified_at":"2026-10-13T02:18:45Z","board_verified":true,"closed_at":null,"days_open":321,"trust":{"level":"stale","repost_count":0,"flags":["stale"],"days_open":320},"description":"You have built real AI systems that ship, break, and get fixed under pressure.\nYou care less about model demos and more about decisions that move capital.\nYou want your work used daily by professional investors, not buried in notebooks.\nYou are comfortable owning hard problems end to end.\nIf you want a calm job optimizing benchmarks, this is not it.\nThe Role, In Plain English\nYou will build and evolve the AI systems that power Reflexivity’s investment insights.\nThis role exists because off-the-shelf models and generic pipelines are not enough.\nYou will work at the intersection of reasoning engines, proprietary data, and real market impact.\nYour work directly affects how investors understand earnings, risk, and market catalysts.\nWhat You’ll Be Responsible For\nDesign, fine-tune, and deploy ML and LLM-driven systems used in production by professional investors\nBuild and maintain inference pipelines that are fast, observable, and reliable\nIntegrate OpenAI, Gemini, and Anthropic models into reasoning and knowledge systems\nWork closely with backend engineers to productionize models in Golang-based services\nImprove signal quality, not just model accuracy\nReview code and designs with a bias toward long-term maintainability\nWhat “Good” Looks Like in This Role\nAfter 3 months:\nYou understand the product, data flows, and investor use cases deeply. You ship meaningful improvements.\nAfter 6 months:\nYou own major parts of the AI stack. Your work improves insight quality and latency measurably.\nAfter 12 months:\nYou are a technical reference point for AI decisions. You raise the bar for how AI is built at Reflexivity.\nWho You Are (Must-Haves)\n5 plus years building ML or applied AI systems in production\nStartup experience working on a core product, not a side project\nStrong Python skills and experience integrating with backend systems\nHands-on experience with AI-assisted coding tools like Cursor or Claude Code\nFintech experience or strong personal investment background\nComfortable owning outcomes, not just tasks\nNice-to-Haves (Not Deal Breakers)\nExperience with LLM reasoning systems or knowledge graphs\nExposure to Golang-based ML integrations\nPrior experience supporting investor-facing products\nHow We Work\nIn-office team with high trust and high ownership\nDirect communication, minimal process, strong opinions backed by data\nEngineers are expected to think about product impact, not just code\nWe move fast when it matters and slow down when correctness matters more\nWhy This Role Is Worth Your Time\nDirect influence on how professional investors make decisions\nHard problems at the edge of AI, data, and finance\nReal ownership and technical autonomy\nSenior peers who care about quality and outcomes\nCompensation & Practicalities\nBase salary: £90,000 to £160,000 depending on experience\nEquity included\nIn-office role based in London\nNo agency candidates\n£90,000-£160,000 GBP","description_format":"text","description_chars":2897,"description_truncated":false,"requirements":{"experience_years_min":5,"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":false,"industries":["Artificial Intelligence","Explainable AI (XAI)"],"lifecycle":[{"event":"open","at":"2026-10-03T15:13:21Z"}],"visa":[],"liveness":{"score":8,"band":"cold","label":"Long shot","p_open":1,"p_active":0.278,"p_room":0.28,"age_days":320,"expected_fill_days":37,"reasons":["conf:0","win:tail","crowd:"],"computed_at":"2026-10-12T06:55:09Z"},"pay":{"stated_usd_annual":211955,"is_top_pay":true},"html_url":"https://alion.io/job/reflexivity-machine-learning-and-ai-engineer-london","json_url":"https://alion.io/job/reflexivity-machine-learning-and-ai-engineer-london.json","meta":{"generated_at":"2026-10-13T03:57:04Z","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":6406,"day_limit":null,"remaining_today":null,"minute_limit":300,"resets_at":"2026-10-14T00:00:00Z"}},"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":2241328},"rest":"https://alion.io/mcp/rest/get_company?id=2241328"},"human":"https://alion.io/catalog?offer=company.slices&for=job%2Freflexivity-machine-learning-and-ai-engineer-london"},{"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%2Freflexivity-machine-learning-and-ai-engineer-london"},{"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%2Freflexivity-machine-learning-and-ai-engineer-london"},{"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/reflexivity-machine-learning-and-ai-engineer-london\", \"note\": \"what you need it for\"}"},"human":"https://alion.io/catalog?offer=company.verify&for=job%2Freflexivity-machine-learning-and-ai-engineer-london"}]}