API Engineer (H/F)

Issy-les-Moulineaux, Île-de-France, FranceFull-time2026-10-28 → 2026-11-10

Core

Backend/Fullstack API Engineer responsible for designing architecture, writing technical specs, and developing endpoints for connected health devices.

Role type

Senior IC API Engineer

Builds

Internal API framework and services connecting Withings' health products (scales, watches, blood pressure monitors) and partners.

Domain

Consumer Health Tech / IoT

Deliverable

production ML models

Required skills

Backend development, API design, database modeling, SQL optimization, React, LLM integration, code review, performance monitoring

Preferred skills

PHP framework experience, generative AI tools usage, agile methodology

Technologies

PHP, React, SQL, LLMs

Responsibilities

Analyze and challenge functional specs from PMs, model databases and define API endpoints, develop new endpoints and maintain existing services, debug and optimize SQL queries, integrate LLMs for documentation and testing, monitor API errors and performance

Seniority

Mid-Senior, hands-on IC

About Withings

Withings is on a mission to be the trusted leader in clinical-grade smart health devices. Already the leading innovator of smart scales, our product portfolio includes connected scales, blood pressure monitors, sleep monitors, thermometers, and health/activity wearables. In 2019, we launched Withings Health Solutions (WHS) to bridge the gap between patients and providers. This fast-growing B2B division enables healthcare innovators—from chronic condition management to clinical research—to provide better care through our ecosystem of connected devices and our remote patient monitoring platform.