{"id":1578899,"url":"https://alion.io/job/rex-founding-ai-engineer-enterprise-finance-operations","title":"Founding AI Engineer (Enterprise Finance Operations)","company":{"id":3779973,"name":"Rex","domain":"rex.inc","url":"https://alion.io/company/rex-7","size_band":"11-50","is_staffing_agency":false,"employer_type":"direct","is_intermediary":false,"listed_via":null,"ats_vendor":"Work at a Startup","truth_index":null},"role":"AI/ML","role_family":"AI/ML","seniority":"junior","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":150000,"max":250000,"currency":"USD","period":"year","gross":null,"usd_annual":250000},"salary_estimate":null,"experience_years_min":1,"visa_sponsorship":false,"relocation_package":false,"has_equity":true,"technologies":[{"name":"AI Agents","optional":false},{"name":"Function Calling","optional":false},{"name":"Apache Kafka","optional":true}],"status":"live","first_seen_at":"2026-10-01T12:04:51Z","employer_posted_date":"2026-10-22","last_verified_at":"2026-10-22T08:52:48Z","board_verified":true,"closed_at":null,"days_open":20,"trust":{"level":"ok","repost_count":null,"flags":[],"days_open":20},"description":"AI Transformation for Enterprise Finance\nRex builds AI agents for enterprise finance, starting with order to cash. Our customers delegate a process to us, and we run it with agents while finance experts oversee the work. Our agents operate across email, ERPs and customer portals to resolve payment blockers and help businesses get paid.\nWe’re building agents that can take responsibility for complex financial workflows: reason over messy data, handle exceptions and improve through feedback from finance experts. The challenge is earning the trust to act autonomously in operations that affect real money.\nWho we are\nRex was founded in 2026 by Merlin Kafka (CEO) and Lewis Blackwood (CTO).\nMerlin previously served as CPO at Sequence (a16z) and PM at Tessian (Sequoia), and studied industrial engineering at Cambridge. Lewis previously led engineering at Sequence, joined GoCardless early and founded a startup backed by GFC. He studied economics at Cambridge.\nOur team brings years of experience building AI and finance products and working with hundreds of finance teams. We know this domain inside-out.\nRex is global from day one and operates across San Francisco and London.\nWhat you’ll do\nThis is a generalist role and you will be immediately responsible for large product areas and new initiatives. You’ll build products end to end, from understanding a customer’s finance workflow to shipping agents that carry it out. Your work will span the agents, the financial context they reason over, and the tools finance teams use to oversee them. You’ll also build the infrastructure, evaluations and feedback loops that help agents improve from real work. You will ship to production on your first day.\nYou’ll fit if you\nHave around 2-3 years of software engineering experience and have shipped products people use.\nHave hands-on experience building with LLMs, agents and tool use.\nCan work across the stack and own a problem through to production.\nLearn quickly and want to understand how enterprise finance actually works.\nThis role is full-time in-person in London.","description_format":"text","description_chars":2071,"description_truncated":false,"requirements":{"experience_years_min":1,"management_years_min":null,"team_size_min":null,"manages_managers":false,"education":null,"security_clearance":false,"languages":[]},"benefits":[],"hiring_locations":[],"hiring_excludes":[],"relocation_offered":false,"industries":["Machine Learning","Financial Software & Embedded Finance"],"lifecycle":[{"event":"open","at":"2026-10-01T12:04:51Z"}],"visa":[],"liveness":{"score":52,"band":"ok","label":"Likely open","p_open":1,"p_active":0.688,"p_room":0.75,"age_days":20,"expected_fill_days":24,"reasons":["conf:0","win:late","comp:junior"],"computed_at":"2026-10-22T06:10:10Z"},"pay":{"stated_usd_annual":250000,"is_top_pay":true},"html_url":"https://alion.io/job/rex-founding-ai-engineer-enterprise-finance-operations","json_url":"https://alion.io/job/rex-founding-ai-engineer-enterprise-finance-operations.json","meta":{"generated_at":"2026-10-22T10:20:05Z","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":7574,"day_limit":null,"remaining_today":null,"minute_limit":300,"resets_at":"2026-10-23T00:00:00Z"}},"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":3779973},"rest":"https://alion.io/mcp/rest/get_company?id=3779973"},"human":"https://alion.io/catalog?offer=company.slices&for=job%2Frex-founding-ai-engineer-enterprise-finance-operations"},{"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%2Frex-founding-ai-engineer-enterprise-finance-operations"},{"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%2Frex-founding-ai-engineer-enterprise-finance-operations"},{"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/rex-founding-ai-engineer-enterprise-finance-operations\", \"note\": \"what you need it for\"}"},"human":"https://alion.io/catalog?offer=company.verify&for=job%2Frex-founding-ai-engineer-enterprise-finance-operations"}]}