Senior Software Engineer - Node.js/TypeScript (x/f/m)

Unlimited Contract

Engineering

Berlin, Germany

Über Doctolib

Bei Doctolib gestalten wir das Gesundheitswesen neu. Täglich vertrauen uns 570.000 Gesundheitsfachkräfte und über 90 Millionen Patient:innen, um ihre Arbeit besser zu machen und gesünder zu leben.

Mehr als 3.000 Doctoliber in Frankreich, Deutschland, Italien, UK und den Niederlanden bauen die nächste Generation von Health-Tech. KI ist dabei kein Add-on, sondern der Kern unseres Produkts und unserer DNA. Wir fördern eine Kultur, in der jede:r täglich mit KI arbeitet, um schneller und besser zu werden und echten Impact zu erzielen.

Stellenbeschreibung

Set a new pulse for healthcare!

We are looking for a Senior Software Engineer to join the DIAL team in the Phone Assistant domain.

Your mission will be to design, build, and scale the AI-powered features that transform how practitioners and patients connect over the phone — making care more accessible for patients and reducing administrative burden for health professionals. You will work in a feature team developing the Phone Assistant, Doctolib's solution that combines LLM reasoning, speech recognition, and real-time backend systems, launching first in Germany and expanding to France and Italy.

Working in the tech team at Doctolib means building innovative products and features to improve the daily lives of care teams and patients.

What you'll do

Your responsibilities include but are not limited to:

Build and operate backend services in Node.js/TypeScript (with Python exposure), designing for reliability, scalability, and real-time performance
Design, evaluate, and ship LLM-based features end-to-end: prompt engineering, tool calling, structured outputs, guardrails, and fallback strategies
Own AI feature quality: build evaluation datasets and scorers (e.g., in Braintrust), track regressions, and make evidence-based ship decisions before each release