Founding Engineer

This role is with one of Dex's trusted partner companies. We work closely with their teams to truly understand their culture, goals, and what they're looking for, so we can match you with the right opportunity and give you context about the role before you commit to a process. If you're interested sign up to Dex to apply. Dex is an AI recruiter agent that helps you run your job search. Tell Dex your stack, seniority, and what you want to build. We will manage your applications and surface other opportunities that are a fit. The role This company is building the compliance layer for regulated infrastructure, starting with critical national assets like the NHS estate. They are solving a genuinely hard problem: bringing search, evidence, workflow, and assurance into one platform for sectors where safety and regulatory adherence are paramount. With paying customers and strong traction, they are rapidly expanding their impact. As a Founding Engineer, you'll be the senior addition to a small, high-calibre engineering team, working alongside the CTO and Head of ML & Platform. This isn't a role where you'll be handed detailed specs; you'll own problems end-to-end, from understanding user needs to designing and shipping solutions. You'll make architectural decisions that directly impact the product, not just implement them. The work Build agentic AI workflows that hold up in production.Lead backend development in Python and FastAPI.Architect the PostgreSQL data layer.Drive CI/CD and Azure deployments.Contribute to the React frontend when needed. What You Bring You've owned an area of responsibility back-to-front at a startup, taking customer requirements through to production code, without needing to have managed anyone.You're strong in Python backend work and think in domain-driven design, clean architecture, and event-driven patterns.You've built with large language models in real systems that shipped, not just experimented with them.You use AI coding tools as a normal part of how you work, and you're pushing on what they can do.You're comfortable travelling to the Cambridge office once a week to sync with the rest of the engineering team. Why apply through Dex Founding Engineer roles like this are rare and often filled through networks. Dex helps you cut through the noise: sign up once, get matched to this role and others like it, and skip the cold application process. We'll brief you properly before any interviews, so you know exactly what you're getting into. If you're interested, sign up to Dex to apply - https://jobs.meetdex.ai/jobs/9211e3cb-5058-4791-8de6-d3c820643596 As part of the recruitment process at Dex, we process your personal data in accordance with our Privacy Notice for Job Applicants. This notice explains how and why your data is collected and used, and how you can contact us if you have any concerns.