Software Engineer

Software Engineer LocationLondonEmployment TypeFull timeLocation TypeOn-siteDepartmentEngineeringAbout DelfaBillions of people still suffer from every-day diseases.One key reason? Clinical trials are broken.Despite $120 billion spent each year, most trials are delayed due to bottlenecks like patient recruitment.Delfa is fixing this with autonomous AI agents. We're building AI agents to automate clinical trials.In less than a year from launch we’ve already:Deployed onto 300+ trials across multiple conditionsReached seven figures in ARR, growing 25% MoMRaised an oversubscribed $3.8m seed from tier-one AI investorsWhat You'll DoYou'll build and scale the core systems that enable Delfa's AI agents to deliver real-world clinical impact. Design, build, and scale AI agent systems end-to-end: from voice interactions to intelligent workflow orchestration across trial sitesOwn complex projects from architecture to deployment, with real autonomy over technical decisionsBuild and evolve the infrastructure, observability, and monitoring systems needed to ensure quality and reliability at scaleIntegrate leading-edge models from AI labs into production workflows, evaluating and adopting new capabilities as the frontier movesDesign robust data pipelines for ingesting, transforming, and serving high-quality healthcare dataContinuously improve internal AI tooling and platform to unlock new use cases and increase team velocityOur current tech stack:FastAPI · Pydantic · TypeScript · React · OpenAI / Anthropic · Temporal · PostgreSQL · Honeycomb · PlanetScale · Azure You'll Be A Great Fit If…You have 3+ years of professional full-stack engineering experience: We're looking for somebody comfortable with solving hard technical problems, refactoring when needed, and knowing what's enough and what's too much to solve a problem.A track record of building high-quality products fast: Delfa's got big ambitions to materially accelerate getting life saving treatments to market. This is necessary and urgent work so we need individuals who can deliver.An ownership mindset: We position our team to understand customer problems, give you the autonomy to find the best path forward, and expect you to own the solutions.A growth mindset: We're looking for people who take pride in their work and are always looking to improve it. If your work doesn't matter to you, it won't end up mattering to our customers. If you're not growing, your impact won't grow either.Life at DelfaDelfa is building a generational company to transform the way medications reach millions of patients in need.This is your opportunity to get in on the ground floor and work alongside the highest talent density team in the space, onsite at our London office 5 days a week:A wine-snob who built foundation models at Roche at ETH ZurichA former hedge fund trader with world class causal AI knowledgeA medical doctor turned AI engineer who builds prototypes on the weekend for funA ginger bloke who deployed production AI for J&J, Medtronic, and ExscientiaWhat We OfferCompetitive salary + meaningful equityPrivate health insurance and gym membership25 days’ holiday + UK public holidaysModern office space 5 mins from Old Street stationTrue 0 → 1 ownership. You’ll take full responsibility for critical product features that get new treatments to patients, faster.Our Hiring ProcessWe work to get you an offer within a week with the following lean process:Intro chat with Gustav (CTO) - 30 mins: An informal discussion about your experiences, values, and career goals, and give you an opportunity to get a sense of the role and the team. After this call we may ask you to share some work you’re proud of.Coding Challenge - 90 mins: No artificial interview questions. Instead, you will work through a real-world challenge similar to problems we solve every day. You are welcome to use AI tools. We believe great engineers should know how to solve problems effectively, including with AI.System Design Challenge - 90 mins: We...