Making preventive health the default for every human in EuropeThe missionAt Lucis, we believe healthcare should be preventive, not reactive. We’re building the OS for human longevity to help people add more healthy years to their lives. You can read more about who we are and how we work here.The roleWe’ve processed 200,000+ clinical tests across 4 countries with a team of 20. We’re growing 10% week over week. And we’re still early.We’re looking for a mobile frontend engineer who treats the app as a craft, not a checklist. You care about the half-pixel, the spring curve on a transition, the way a screen feels in the hand, and you can build it. You own the mobile experience end-to-end in our monorepo, orchestrate AI to execute, and raise the bar for everyone around you.You won’t spend your days writing boilerplate. You’ll write specs that agents execute, review AI-generated code with a critical eye, and make decisions that compound over time. This is what engineering looks like now. If that excites you, keep reading.What we’re looking for: Mobile frontend, design engineering & world-class craftA confirmed mobile engineer (8+ years) with exceptional craft and a real sensibility for design. You live in Expo and React Native, you care deeply about how the product feels, and you don’t wait for designs to be ready to propose something delightful. You have also experience building native experience. You think in interactions, motion, and detail.You’ll own what members touch every day: onboarding, the core app surfaces, the moments that turn a first-time visitor into someone who trusts us with their health. Your work has to be delightful and reliable on real devices, for people who decide in minutes whether to trust us.About YouYou’re passionate about the future of human health and want your work to help people stay healthy for longer. You move quickly from idea to execution, take full ownership of what you build, and work best with talented people who care as much as you do.You thrive in fast‑moving environments, learn by doing, and value feedback as a way to continuously improve. You use AI the way others use a calculator: naturally, to go faster and think bigger.You’ll fit in well ifYou've shipped at least one product from 0→1 and felt the difference between writing code and building a systemYou have 2 deep areas of expertise and can operate across the full stack when the situation demands itYou write specs before you write code — precise enough that an AI agent executes correctly on the first passYou review AI-generated code with the same rigor you'd apply to a junior engineer's PR: edge cases, security gaps, design smellYou bias toward shipping. A good decision today beats a perfect one next weekYou're genuinely interested in health — maybe you track your own biomarkers, or you're just frustrated that healthcare is still reactiveWe would not be a fit ifYou need a clearly scoped role before you can operateYou measure output in lines of code writtenYou've only worked in large orgs with dedicated infra, QA, and platform teamsYou optimize for stability over velocityOur current stackTypeScript monorepo React Native NestJS PostgreSQL + Prisma AWS (Terraform, Qovery) GitHub Actions Claude Code + CursorThe processIntro call (20 min): culture & role fit. Technical interview (30 min)At-home case study: hands-on project, delivery in 2 days. Deep dive (90 min) and team chat (on-site)Reference callsHow we workWe work together from our Paris hub. We’re passionate about what we’re building and believe the fastest way to create something exceptional is side by side. We’re open to relocation support for the right individuals, and we welcome missionaries who travel to work with us in Paris on a regular basis.Rigor without ego: Audits, science, and code all deserve the same high bar. Radical ownership: Feedback loops are short; everyone contributes to building the best version of Lucis. Velocity over perfection: We ship daily and prefer a good decision today over a perfect one next week. At Lucis, AI isn't just our product, it's our engine. 100% of our teams are equipped with the best AI agents. You have carte blanche to explore and automate everything that can be, so you can focus exclusively on high-value work.

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Mobile frontend engineering