Product Engineer (Backend) | UK / EU

High-Impact Backend Role | AI-Native Legal PlatformRemote (GMT-5 to GMT+1 overlap) UK & EU Only | Optional hubs: London / New YorkFull-time | Mid–Senior£100,000 – £200,000 + meaningful equityOur client — AI-native LegalTech companyTravel: London every 5–6 weeksWork AuthorizationMust be eligible to work in the UK, EUNo visa sponsorship currently specifiedMust be able to travel to London every 5–6 weeksAbout The OpportunityOur client is rebuilding legal services from the ground up. Backed by $9M+ from a tier-1 US VC, the team is creating a Cursor-like environment where lawyers collaborate with AI agents on real legal work.You will join a small, high-caliber engineering team growing from 2 to 5, with direct ownership over systems used daily by real lawyers.This is a product-first backend role where reliability, safety, and extensibility are mission-critical.What You'll BuildCore product APIs powering matters, documents, chats, and permissionsScalable data models supporting evolving agent workflowsAgent-facing backend primitives enabling safe autonomous actionsProduction infrastructure focused on reliability and observabilitySystems that remain auditable, reversible, and correct in real legal workflowsTech EnvironmentPython (core backend language)Postgres (primary datastore)Cloud infrastructure (GCP preferred)API-first product architectureAI-assisted engineering workflowsWhat They're Looking ForStrong production experience with Python backend systemsProven API and data model design capabilityExperience translating product goals into reliable backend architectureTrack record of owning systems end-to-end in fast environmentsComfortable working remotely with required time zone overlapNice to HaveExperience building products from zero to one or early-stage startup experienceExperience with Postgres at scaleExposure to Temporal or background job systemsFamiliarity with GCP environmentsBackground in collaborative or workflow-heavy SaaSWhy This Role Stands OutMeaningful equity in a well-funded early-stage companyUnlimited budget for AI coding toolsReal product ownership from day oneAnnual Mallorca offsite + regular team gatheringsTight feedback loop with real legal usersEarly-stage, real users, real ownership — if you build backend systems that must work flawlessly in production, we'd love to meet you...