Founding software engineer

Join to apply for the Founding software engineer role at Lucis (YC X25)3 days ago Be among the first 25 applicantsJoin to apply for the Founding software engineer role at Lucis (YC X25)Get AI-powered advice on this job and more exclusive features.This range is provided by Lucis (YC X25). Your actual pay will be based on your skills and experience — talk with your recruiter to learn more.Base pay rangeThe roleWe’re looking for a full stack software engineer, product-minded, with entrepreneurial DNA and early stage 0→1 experience. It’s a plus if you are passionate about digital health and longevity.You’ll Join As a Founding Engineer And Shape a Product That Could Add Healthy Years To Millions Of Lives. As The First Full-time Founding Engineer, You WillOwn mission-critical code from day 1, not ticketsShape product and tech choices that will impact thousand of users, starting with yourselfSolve real-world health data, privacy, and UX puzzles at European scaleHave a unique opportunity to shape the vision and direction of the companyOur cultureWe are building fast, for the long term.Rigor without ego: audits, science, and code deserve the same high bar.Default to action: small PRs, short feedback loops.Radical ownership: you break it, you fix it (and write the doc).Play long games: we’re building a 100-year company to help people live 100 healthy years.What We OfferEquity that matters: real ownership at the inflection point. With top-tier salaries.Budget for personal care, personal development, and health stipends (we pay your own Lucis tests).Quarterly in-person retreats in Europe. We repeat the YC experience every 3 months.Hardware of your choice, modern dev-tool stack.The chance to directly improve thousands of lives, starting with your own, through smarter preventive care. We are the average of the person we spend our time with.Core ResponsibilitiesWhat you will doDesign and build full-stack features (TypeScript/Next.js, NestJS, Postgres, Prisma).Own cloud infra (AWS) and CI/CD (GitHub Actions, AWS CDK) with a security-first mindset. Security is core of what we do (HDS compliant).Collaborate with medical advisors, the AI (Founding AI & data engineer), product and design team (‣) to translate biomarker science into reproducible algorithm.Architect highly available and scalable systems, with expertise in PostgreSQL performance optimization. Contribute to the scabalibility of our tech stack. Design and maintain improved version of our stack**, implement caching,**Maintain strict compliance with HDS and GDPR regulations through robust security measures.Drive engineering rituals. Drive continuous improvement through Agile development practices and cross-team collaboration.Our tech stackTypescript mono repoPNPM workspacesES lintingStorybookReact, NestJS (Node)AWS, Fargate, Infra as code AWS CDKDockerPrisma, Postgres dbCI/CD Github ActionsTailwindYou’ll thrive here if youHave 7+ years building production SaaS or B2C apps, including at least one 0→1 journey.Can move vertically: front-end → API → data model → DevOps, shipping quality code in each layer. You have 2 core expertises.You have experience building systems enabled by AI tools. You are fluent in Cursor PRD files.Entrepreneurial, low-ego mindset. You want to build a massive company with massive impact.Cautious about your health, actively doing sport. Care about health: you read PubMed abstracts for fun, or track your own biomarkers and metrics.Fluent in English. French is a bonus.You have led a team before. You remain hands-on more than 80% of your time in your current job.Seniority levelSeniority levelMid-Senior levelEmployment typeEmployment typeFull-timeJob functionJob functionEngineering and Information TechnologyIndustriesHealth and Human ServicesReferrals increase your chances of interviewing at Lucis (YC X25) by 2xGet notified about new Software Engineer jobs in Paris, Île-de-France, France.Full Stack Developer - Paris - F/H/X - CDIFull Stack Engineer (Python, React, AI Builder)We’re unlocking community knowledge in a new way. Experts add insights directly into each article, started with the help of AI. #J-18808-Ljbffr