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Lucis (YC X25) Tech Stack

Longevity biomarker analysis via blood test and AI

Health and Human Services Paris 2–10 employees Founded 2024 Privately Held
lucis.life LinkedIn

Lucis uses LangChain, Claude, and a multi-agent AI system to translate blood-test data into personalized longevity insights. The stack reveals a company building both inference infrastructure (vector/RAG, LLM endpoint reliability) and go-to-market velocity (Braze, Klaviyo, AppsFlyer, paid-spend scaling to €150k+). Hiring is balanced between marketing (3), engineering (2), and leadership roles, suggesting a product-market fit phase where clinical credibility and user acquisition are moving in parallel.

Tech Stack 24 technologies

Core StackIntercom AWS Terraform LangChain Python AppsFlyer Klaviyo Braze Customer.io Airtable Figma AWS CDK Meta Google TikTok YouTube Notion ChatGPT Claude Excel Google Sheets

What Lucis (YC X25) Is Building

◆Challenges

  • Missing samples
  • Delays
  • Bugs
  • Scaling infrastructure to handle 10× load
  • Maintaining hds and gdpr compliance
  • Scaling to millions of users
  • Production reliability of llm endpoints
  • Clean data ingestion from labs
  • Scaling paid spend while keeping cac low
  • Launching new markets

▲Active Projects

  • Full-stack vertical ownership
  • Clinical science algorithm translation
  • Scalable hds-compliant infrastructure design
  • Content system
  • Seo keyword ranking
  • Multi-agent system for ai doctor
  • Vector infrastructure and rag architecture
  • Data ingestion and normalization pipelines
  • Scaling paid spend to €150k+
  • Launching uk paid market at cac ≤ €90

Hiring Activity

Accelerating7 roles · 7 in 30d

Department

Marketing
3
Engineering
2
Executive
1
Support
1

Seniority

Mid
3
Senior
3
Lead
1
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About Lucis (YC X25)

Lucis is a Paris-based longevity platform that interprets blood biomarkers through AI to help users understand their health trajectory and lifespan projections. The product ingests lab data, normalizes it through pipelines, and applies clinical science algorithms powered by LLMs to generate personalized insights. The company operates under HDS and GDPR compliance frameworks. Current focus areas include scaling paid acquisition across European markets (UK launch underway at €90 CAC target), maintaining production reliability of LLM endpoints, and handling 10× load growth on infrastructure.

HeadquartersParis
Company Size2–10 employees
Founded2024
Hiring MarketsFrance

Frequently Asked Questions

What tech stack does Lucis use?

Lucis uses AWS, Terraform, Python, LangChain, Claude, and ChatGPT for core product. For go-to-market: Braze, Klaviyo, AppsFlyer, and Intercom. Data and collaboration tools include Airtable, Notion, and Figma.

What is Lucis working on?

Multi-agent AI doctor system, vector/RAG architecture, HDS-compliant infrastructure scaling, clinical algorithm translation, and geographic expansion (UK market launch). Also scaling paid acquisition spend while managing customer acquisition cost.