Lucis is building Europe’s first preventive health platform: from blood testing to advanced AI-driven insights and action plan.

We already serve 1000+ of users in 🇫🇷, 🇵🇹 and 🇬🇧 and are integrating with dozens of lab partners.

• Team of passionate and tier-1 operators
• Backed by YC X25 and a seed round led by tier-1 investors, athletes & operators
• A live AI "doctor" agent already shipping actionable protocols every day

We’re a small, ambitious team of repeat founders, biohackers.

We’re growing extremely fast (10% week over week) and scaling to empower more Europeans to take control of their health.

Paris-based and YC-backed (X25), we’re funded by a top-tier global VC, a specialised healthcare fund, athletes, and serial entrepreneurs, including the founders of Airbyte, Strapi, Sqreen, WePay, Plato, Veepee, and Zenly.

As our first founding designer, you'll shape both product and brand strategy, and design systems from the ground up, reporting directly to our CTO with significant input on the product roadmap.

On the day-to-day, you’ll:

• Own the end-to-end design process from user research and ideation to high-fidelity mockups and implementation.
• Create intuitive interfaces that transform complex health data into actionable insights.
• Design and develop our product design system, establishing patterns and components that can scale.
• Collaborate closely with engineering and product teams to ensure seamless implementation of designs.
• Conduct user testing to validate design decisions and identify opportunities for improvement.
• Build features that foster community engagement and support among users.
• Help define product strategy based on user needs and business objectives.
• Ensure our consumer brand remains consistent across the company materials and communication channels.
• Work with the GTM team on the website and marketing materials.

You’ll thrive here if you

• 5+ years product design experience. Consumer products experience is a plus.
• Master of Figma. Experience with design systems and component-based design.
• You have reinvented broken user experiences.
• Solid grasp of the healthcare ecosystem and preventive health space. Comfortable with data-heavy design. Ability to translate complex data into Apple-grade interfaces.
• Bias for shipping small, safe experiments fast.
• 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.

Our culture

We are building fast, for the long term.

1. Rigor without ego: audits, science, and code deserve the same high bar.
2. Default to action: small PRs, short feedback loops.
3. Radical ownership: you break it, you fix it (and write the doc).
4. Play long games: we’re building a 100-year company to help people live 100 healthy years.

What we offer

• Equity 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.

We’re building the AI health companion people have been dreaming of — always in your pocket, clinically reliable, and deeply personalized.

To get there, we combine:

•	Clinical-grade diagnostics – Blood, microbiome, and lifestyle data integrated from leading lab networks across Europe
•	Biological & medical intelligence – Evidence-based biomarker interpretation powered by the latest in preventive medicine and longevity science
•	AI-native architecture – LLM- and agent-based systems to deliver instant, context-aware health guidance
•	Privacy-first infrastructure – GDPR/health-data compliant, secure-by-design, and interoperable with healthcare standards

Our stack:

•	Frontend: React Native / Next.js
•	Backend: Node.js, Python, PostgreSQL
•	AI & Data: LangChain, OpenAI, vector databases, event-driven pipelines
•	Infrastructure: AWS, Kubernetes, Terraform, CI/CD automation