Lucis

Making preventive health the default for every human in Europe The mission At 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 role We're building AI agents that act as a doctor for preventive health — analyzing 110+ biomarkers, reasoning over clinical data, and delivering protocols that change how people age. The system works. Now we need to make it smarter, faster, and ready for millions of users. As our AI Engineer, you own the reasoning engine: the agents, the retrieval pipelines, the clinical workflows, and the infrastructure that makes it all reliable in production. You work directly with our medical team to translate clinical knowledge into systems that actually behave like they understand it. This isn't a research role. It's a build role. The gap between a great LLM demo and a trustworthy AI doctor is enormous — your job is to close it. You'll be responsible for AI agent architecture — design and ship the multi-agent system behind our AI doctor: reasoning, planning, tool use, clinical citation, and safe fallback behavior Retrieval & knowledge — vector infrastructure, embedding pipelines, RAG architecture over clinical literature and user health data. You know the difference between retrieval that works and retrieval that a clinician would trust Data pipelines — ingestion and normalization from labs (Eurofins, Randox), wearables, and third-party partners. Clean data in, reliable inference out Production reliability — LLM endpoints that reason correctly at scale, with observability, evals, and failure modes you've thought through before they happen Medical collaboration — translate complex clinical requirements into agent workflows, working side by side with our medical advisors. You don't need to be a doctor, but you need to earn their trust 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’ll fit in well if You have 8+ years' experience building and shipping software and ML systems in production You've shipped AI agents in production recently — not as a side project, as the core product You think in systems: prompts, retrieval, tool orchestration, evals, and failure modes are all part of the same design problem You're hands-on with vector databases, retrieval pipelines, and LLM endpoints — Python-native, comfortable in LangChain or equivalent You write evals before you ship, because you know that vibes-based QA doesn't work for clinical reasoning You've worked with messy real-world data (health, finance, legal) and built pipelines that handle it without breaking silently You're genuinely obsessed with health — you track your own biomarkers, read PubMed, or are just deeply frustrated that healthcare is still reactive We might not be a fit if You need a clearly defined role with stable responsibilities. You prefer strategic advisory work over hands-on execution. You've only worked in large, well-established companies. You need perfect information before making decisions. You prioritise predictable 9–5 work over mission intensity. You're uncomfortable with frequent context-switching and urgent pivots. Our current stack Python repo and TS monorepo (platform) · PostgreSQL + Prisma · AWS (Terraform) · GitHub Actions · Claude Code + Cursor · AI/agent framework: mostly Langchain ecosystem 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 hu

Making preventive health the default for every human in Europe The mission At 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 role We're looking for a Brand & Content Manager who will own our voice, our content engine, and our organic presence. About you What you'll own Brand guidelines and tone of voice (and making sure the whole company lives them) Content strategy: blog, social, email — across all our markets SEO strategy and organic content performance Health education content — making complex science genuinely useful Creative briefs for paid and organic campaigns Content production coordination with freelancers and agencies What good looks like 20+ content pieces/month across formats and channels 3 high-intent SEO keywords ranking on page 1 in France within 6 months A content system that works without you personally producing every piece Content that makes people trust Lucis with their health data What we're looking for You have a portfolio that demonstrates both strategic thinking and actual writing quality You understand SEO — not just keywords, but the intent behind them and how content earns authority You can write about complex health topics in ways that are clear, useful, and never alarmist You're French native or near-native, with professional English You've owned a brand in-house — not just executed someone else's guidelines Nice to have Experience in health, wellness, or another regulated category Multi-market content localisation experience Has managed freelancers or a small content team Familiarity with SEMrush, Ahrefs, Webflow Why Lucis Own the brand voice of a category-defining health platform Work at the intersection of science and storytelling Paris-based team with European ambitions 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.

Making preventive health the default for every human in Europe The mission At 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 role We’re looking for a reliable, empathetic Customer Support Specialist to be on the front line for our customers and lab partners, with core responsibility for weekend coverage. You’ll help users move smoothly from ordering a test to receiving and understanding their results, and you’ll coordinate with our lab network when things get complex. This individual contributor role, responsible for: Providing friendly, timely support to customers via email, Intercom chat and phone, resolving questions about account setup, the testing process, results and general platform use. Acting as a point of contact for collaboration and troubleshooting with our lab partner network, ensuring smooth coordination and clear communication. Logging and tracking customer interactions accurately in our support tools, escalating issues to internal teams (ops, labs, product, engineering) when needed. Helping manage operational issues (e.g. missing samples, delays, bugs) and keeping customers informed while we resolve them. Spotting common user pain points and sharing insights to improve support flows, FAQs and product experience. Maintaining a high standard of professionalism and confidentiality when handling sensitive health‑related information. 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 Have 2-4 years of hands‑on customer support experience in a B2C environment (apps, platforms or other consumer services). Have worked in operationally complex or sensitive contexts e.g. health/wellness, logistics/delivery, fintech, insurance, travel - where things can break and you coordinate to fix them. Are comfortable working core hours on weekends and managing your time independently. Have experience handling high ticket volumes, SLAs and peak periods, and can stay calm when several issues hit at once. Can give examples of dealing with stressed or anxious customers and de‑escalating situations. Are data‑driven, curious and rigorous in how you make decisions and propose improvements. Have worked with creators, influencers or ambassadors, or are familiar with the creator economy (e.g. Instagram, YouTube, TikTok, LinkedIn collaborations). Take radical ownership of customer issues and prefer to follow problems through to resolution rather than just handing them off. Are a native French speaker and fluent in English, and can write clear, friendly messages in both. Have hands‑on experience with modern support tools (e.g. Intercom/Zendesk/Freshdesk) and at least one CRM or database tool (e.g. Attio, Notion, Airtable, HubSpot). We might not be a fit if You need a clearly defined role with stable responsibilities. You prefer strategic advisory work over hands-on execution. You've only worked in large, well-established companies. You need perfect information before making decisions. You prioritise predictable 9–5 work over mission intensity. You're uncomfortable with frequent context-switching and urgent pivots. 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

Making preventive health the default for every human in Europe The mission At 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 role Be the CEO's strategic right hand — the force multiplier that turns ambiguity into execution. Own critical cross-functional projects, build scalable systems, and interface with investors/partners on behalf of the CEO. What you'll own (first 6 months) Drafting monthly investor updates and maintain investor CRM Coordinating board materials and follow-up action items Leading international expansion prep (UK, Portugal, Spain) Building systems and dashboards for CEO visibility Running weekly leadership syncs with department heads About you You'll fit in well if You have 3–5 years in high-growth startups, strategy consulting, or investment banking You've worked directly with founders or C-level executives in fast-paced environment You're a master of execution: builds financial models, writes crisp decks, ships projects end-to-end You're a SaaS tool power user: Notion, Airtable, Figma, Raycast, AI tools (ChatGPT, Claude) You're a spreadsheet wizard: Advanced Excel/Google Sheets (pivot tables, formulas, dashboards) You're an exceptional writer: Can draft investor memos, board materials, strategic docs You're fluent in English + French (critical for FR/UK/PT markets) We might not be a fit if You need clearly defined role with stable responsibilities You prefer "strategic advisory" work over hands-on execution You've only worked in large, well-established companies (Series C+) You need perfect information before making decisions You're looking for work-life balance over mission intensity You're uncomfortable with frequent context-switching and urgent pivots What excites you Ambiguity → Clarity: Thrives turning messy, undefined problems into structured plans Resourcefulness: Finds creative solutions with limited resources and tight timelines Extreme ownership: Takes full responsibility for outcomes, no excuses Builder mindset: Ships 80% perfect today vs. 100% perfect next month Intellectual curiosity: Dives deep into new domains (health regulation, lab logistics, fintech) Mission-driven: Cares about preventive health, longevity, helping people live better What great looks like Track record of shipping complex cross-functional projects Expert in productivity tools and financial modeling Exceptional written communication for investor/board materials Direct experience working with founders in 0→1 environments Bilingual EN/FR with European market context 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.

Making preventive health the default for every human in Europe The mission At 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 role We're looking for someone to own all new paid customer acquisition — the person who turns our brand into growth. What you'll own: All paid channels: Meta, Google, TikTok, YouTube, programmatic Performance creative strategy and testing infrastructure CAC optimisation across France, UK, Germany, and Spain Attribution and acquisition analytics Referral program growth (with Lifecycle Lead) First media buying hire (within 6 months) What good looks like in 6 months: Monthly paid spend scaled from €50K → €150K+ at CAC ≤ €85 UK market launched on paid (May 2026) at CAC ≤ €90 Creative testing engine running: 20+ new creatives/month, sub-48h launch velocity Attribution framework that actually reflects cross-channel reality What we're looking for: You've personally managed at least €100K+/month in paid media (Meta + Google minimum) You've scaled DTC or subscription acquisition in Europe — you know what works here, not just in the US You can build dashboards and work directly in ad platforms — strategy without execution doesn't cut it here You think in CAC/LTV math, not reach and impressions You're a player-coach: you can build the playbook and run the plays yourself Nice to have: Health, wellness, or regulated consumer experience Multi-market EU scaling (FR, UK, DE, ES) Experience using UGC/influencer content in paid Familiarity with attribution tools: Triple Whale, Northbeam, Adjust, AppsFlyer Why Lucis: Full ownership of acquisition from day one Direct line to the CEO €50K → €400K+ monthly spend trajectory in 18 months Building something that genuinely matters — preventive health for everyone 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.

Making preventive health the default for every human in Europe Location: Paris (hybrid) | Reports to: Philippine, Head of Marketing Lucis is building the new standard of preventive health. Clinical-grade blood diagnostics. Personalized health protocols. Backed by General Catalyst. ~€2M ARR and growing fast across Europe. We're looking for a Lifecycle / CRM Lead to own everything after the first registration. What you'll own: Activation flows from registration to customer Customer onboarding from purchase to first blood result Email and SMS strategy, execution, and copy Customer segmentation and behavioural personalisation Subscription and repeat purchase optimisation Referral program (currently underperforming — you fix it) Retention metrics, cohort analysis, NPS What good looks like: 30-day onboarding sequence with 70%+ completion Referral rate from <3% → 8%+ within 6 months 90-day churn reduced by 15% vs. baseline You know the LTV impact of every lifecycle program you run What we're looking for: You've owned lifecycle/CRM — not contributed to it, but built it and measured the results You can show retention or LTV improvement with actual numbers You're proficient with modern email/SMS platforms (Klaviyo, Braze, Customer.io) You can write — this role includes writing emails, not just designing flows You understand cohort analysis, segmentation, and incrementality measurement You're French or English native or near-native, with professional English/French Nice to have: Subscription or membership business experience Has built a referral program from scratch Background in health, wellness, or DTC Multi-market lifecycle experience Why Lucis: You establish the baseline — there's no predecessor and no ceiling Improving retention by 10% = same impact as acquiring 10% more customers at zero CAC Greenfield: you choose the tech stack, build the segments, own the roadmap

Making preventive health the default for every human in Europe The mission At 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 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 you could own: Full-stack vertical ownership: from data model to API to UI, you hold the whole slice and make it production-grade Algorithms: translate clinical science (in collaboration with our medical advisors) into reproducible, auditable code System architecture: design scalable, HDS-compliant infrastructure on AWS (CDK/Terraform) that can handle 10× the load without rework. Maintaining strict compliance with HDS and GDPR regulations through robust security measures. Engineering culture: run rituals, raise the bar, mentor through code review and spec quality Driving engineering rituals. Driving continuous improvement through Agile development practices and cross-team collaboration. Ensuring the team stays on top of its game. 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: W