Product Engineer

About

Zoī is a deep‑tech startup at the intersection of medicine and wellness, founded by Ismaël Emelien and Paul Dupuy. In 2022 the company raised €20 M in seed capital from leading investors, including Stéphane Bancel, Xavier Niel, Jean‑Marie Messier, and Rodolphe Saadé. By combining advances in medicine, data science, and behavioral science, Zoī provides its members with a state‑of‑the‑art 360° medical check‑up, followed by a personalized digital support system to improve quality of life and healthspan.

Responsibilities

End‑to‑end product development

• Own features from A to Z: understand medical needs, design solutions, implement, ship, and iterate based on feedback.
• Contribute to the medical and operational back‑office built in TypeScript, the mobile app (React Native / Expo), and backend APIs.
• Participate in architecture and system‑design decisions; your opinion matters.
• Work directly with doctors, medical assistants, and operations teams to iterate quickly.

Optimization & AI

• Use AI daily as an accelerator for code generation, testing, review, and documentation.
• Identify product areas where AI can add value for member experience and medical efficiency.
• Integrate LLMs into product workflows when relevant – hands‑on production experience is a strong plus.

Quality & reliability

• Maintain high technical standards: testing, observability, and healthcare data security.
• Monitor your own features in production and respond quickly to issues.
• Contribute to strengthening the CI/CD pipeline (AI‑assisted code review, weekly releases).

Requirements

• 2–3 years of experience in full‑stack development with shipped production products.
• Strong command of any programming language, both frontend and backend, especially with AI.
• Comfortable with system design: APIs, data models, complex lifecycle management.
• Strong frontend sensibility to make complex medical interfaces intuitive and usable.
• Understanding of security fundamentals: access control, role management, healthcare data (HDS), GDPR.
• Strong focus on quality: testing, code reviews, and technical‑debt management.
• Bonus: experience with LLMs / generative AI integrated into real products.

Desired Traits

• True team player: Understand cross‑team challenges, bring ideas, and actively contribute solutions—not just code.
• True builder: Think like a product engineer; co‑create the product, bridging product ambition and technical reality.
• Autonomy: Identify problems, propose solutions, and execute without needing a manager’s direction.
• True achiever: Aim to fundamentally change how things are done, driven by ambition, consistency, and discipline; thrive in high‑standard, high‑execution environments.