---
title: 'Core platform growth engineering at Lucis'
canonical: 'https://feeny.ai/job/core-platform-growth-engineering-lucis-paris-kg16k4zf0php'
type: 'job'
last_seen: '2026-09-08'
---

# Core platform growth engineering at Lucis

- **Company:** Lucis
- **Location:** Paris, France
- **Employment:** full-time
- **Work type:** hybrid
- **Posted:** 2026-08-17
- **Last confirmed live:** 2026-09-08
- **Apply:** https://jobs.ashbyhq.com/lucis/cb0c551d-5ec5-4184-aca8-0b437d7fe51e

## Job description

Making preventive health the default for every human in Europe

The mission

At Lucis https://lucis.life/?utm_source=career_job_desc&utm_medium=content, 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 https://lucis.life/careers?utm_source=career_job_desc&utm_medium=content.

## THE ROLE

We'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 need engineers who build systems, not features, people who own outcomes end-to-end, orchestrate AI to execute, and raise the bar for everyone around them.

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.

We'll shape the exact scope together, mobile, infra, platform, AI, full-stack, based on where you're strongest and where we need it most.

What we are looking for:

- Backend: Membership & payments. A confirmed backend engineer (5+ years) who thrives on designing really reliable data models and services, without over-engineering them. You reach for the simplest model that holds. You'll own the systems membership growth runs on: subscriptions and their lifecycle, checkout and payments, promotions and partner offers.

We're scaling across the EU, with the complexity that comes with it: new countries, currencies, payment methods, and regulations. This is code where a subtle bug costs real money and real trust. You care that the model is right before the endpoint exists, and that every edge case fails safely.

- Frontend: Engagement & world-class experience. A confirmed frontend engineer (5+ years) with very good craft and a real sensibility for design. You like things crystal clear for the user, you build neat interfaces, and you don't wait for designs to be ready to propose something delightful.

You'll own what a first-time visitor meets and what keeps members coming back: the acquisition funnel, onboarding, checkout, the everyday surfaces of the product. Your work has to be delightful and reliable for people who have never heard of us and decide in minutes whether to trust us with their health.

## ABOUT YOU

You’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 if

- You've shipped at least one product from 0→1 and felt the difference between writing code and building a system
- You have 2 deep areas of expertise and can operate across the full stack when the situation demands it
- You write specs before you write code — precise enough that an AI agent executes correctly on the first pass
- You review AI-generated code with the same rigor you'd apply to a junior engineer's PR: edge cases, security gaps, design smell
- You bias toward shipping. A good decision today beats a perfect one next week
- You're genuinely interested in health — maybe you track your own biomarkers, or you're just frustrated that healthcare is still reactive

We would not be a fit if

- You need a clearly scoped role before you can operate
- You measure output in lines of code written
- You've only worked in large orgs with dedicated infra, QA, and platform teams
- You optimize for stability over velocity

Our current stack

TypeScript monorepo · Next.js · NestJS · PostgreSQL + Prisma · AWS (Terraform, Qovery) · GitHub Actions · Claude Code + Cursor

## THE PROCESS

- Intro 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 calls

## HOW WE WORK

We 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.

## About Lucis

## Company Overview
- **One-liner**: Lucis is building Europe’s first AI-driven preventive health platform that combines blood testing with personalised action plans to help people add more healthy years to their lives.
- **Entity Type**: Private (YC-backed, Series A)
- **Headquarters**: Paris, France
- **Founded**: 2025
- **Founders**: Baptiste Debever and Max Berthelot

## Core Business
- **Primary industry**: Healthcare (Preventive health, longevity, healthtech)
- **Target customers**: B2C – health-conscious individuals in Europe who want to move from reactive to proactive healthcare
- **Mission or purpose statement**: “To make preventive health the default for every human in Europe” ([lucis.life/careers](https://www.lucis.life/careers))

## Products & Services
- **Lucis Platform**: An AI-powered preventive health service. Users book a blood draw at certified European labs (Eurofins network), analyse 60–110+ biomarkers, and receive a biological age, personalised scores (energy, inflammation, metabolism, hormones), and a medically reviewed action plan covering nutrition, sleep, supplements, exercise, and mental health. The platform connects to wearables (Withings, Garmin, Oura) for progress tracking and includes an AI chat (“AI doctor” agent). Available as two subscription plans:
  - **Discovery (490€/year)** – Two tests per year across 110+ biomarkers, 11 body systems, full dashboard & AI chat.
  - **Essential (190€/year)** – One annual test with 60 biomarkers, 5 body systems, and a personalised plan. ([lucis.life/press-kit](https://www.lucis.life/press-kit))

## Market Standing
- **Valuation/Market Cap**: Not publicly disclosed
- **Key Metric**: Total funding of $28.5M – $8.5M seed round and $20M Series A (as of June 2026) ([ycombinator.com](https://www.ycombinator.com/companies/lucis))
- **Notable Investors/Partners**: Y Combinator, General Catalyst, Kima Ventures, Motier Ventures, North South Ventures; plus angels including founders of Airbyte, Strapi, Sqreen, WePay, Plato, Veepee, and Zenly ([lucis.life/press-kit](https://www.lucis.life/press-kit))
- **Growth Signals**:
  - Serving 5,000+ paying members across France, Portugal, the UK, and Ireland ([ycombinator.com](https://www.ycombinator.com/companies/lucis))
  - Growing 10% week over week ([ycombinator.com](https://www.ycombinator.com/companies/lucis))
  - Doubled team size in the past year and on track to double again ([lucis.life/careers](https://www.lucis.life/careers))
  - Expanding lab partner network across Europe

## Competitive Advantages
- **AI-native architecture**: An AI “doctor” agent already shipping actionable protocols daily; entire company runs on AI agents for automation and efficiency ([lucis.life/careers](https://www.lucis.life/careers))
- **Comprehensive biomarker analysis**: 110+ biomarkers across 10+ body systems, unmatched breadth in the European consumer preventive health space
- **Full-stack integration**: Certified labs (Eurofins), wearable sync, AI interpretation, and clinical review – all in one platform
- **Data protection**: GDPR compliant and ISO 27001 certified, with strict data standards that build trust ([lucis.life/careers](https://www.lucis.life/careers))
- **Founder-market fit**: Founders combine repeat startup experience with deep domain knowledge in biomarker science and longevity

## Strategic Focus
- **Scale across Europe**: Currently live in France, UK, Ireland, Portugal; aggressively expanding to more markets
- **Product depth**: Enhancing the AI reasoning engine and adding more integrations with labs and wearables to improve the action plan quality
- **Building the “OS” for preventive health**: Shifting from one-time tests to continuous, longitudinal health tracking and automated interventions ([lucis.life/careers](https://www.lucis.life/careers))

## Why Work Here
- **AI-native culture**: Every team member gets unlimited tokens and complete autonomy to automate low-value tasks, freeing time for high-impact work ([lucis.life/careers](https://www.lucis.life/careers))
- **Ownership ethos**: “We hire adults and treat them like owners” – competitive salaries and meaningful equity; you share in the company’s success ([lucis.life/careers](https://www.lucis.life/careers))
- **Flexibility**: Generous, mandatory vacation; wellness stipend; comprehensive health insurance; full access to the Lucis platform (including advanced blood panels) for you and your family ([lucis.life/careers](https://www.lucis.life/careers))
- **Continuous learning**: Budget for books, courses, and conferences; access to experts and mentors from the investor network
- **Work model**: Primarily in-person at the Paris hub; relocation support available for the right candidates; occasional remote flexibility for the right fit ([lucis.life/careers](https://www.lucis.life/careers))
- **Team composition**: Repeat founders, engineers, health science experts – small, ambitious team (currently 17) that moves fast and ships daily ([ycombinator.com](https://www.ycombinator.com/companies/lucis))

## Sources
1. [lucis.life/careers](https://www.lucis.life/careers)
2. [ycombinator.com/companies/lucis/jobs](https://www.ycombinator.com/companies/lucis/jobs)
3. [lucis.life/en/careers](https://www.lucis.life/en/careers)
4. [ycombinator.com/companies/lucis](https://www.ycombinator.com/companies/lucis)
5. [lucis.life/press-kit](https://www.lucis.life/press-kit)

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