About the Position

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

Unlimited Contract

Engineering

Berlin, Germany

About Doctolib

At Doctolib, we’re reinventing the daily lives of health professionals and empowering people to live healthier across Europe.

More than 3,000 Doctolibers across France, Germany, Italy, the UK, and the Netherlands are building a new generation of AI-powered technologies and services, trusted by 580,000 health professionals and over 100 million patients every day.

AI is at the heart of how we build and how we work. At Doctolib, AI fluency is a core skill for every team member: we foster a culture leveraging AI to drive efficiency, quality, and impact at scale.

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.

Responsibilities

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
Deploy and operate cloud-native services on Kubernetes across major cloud providers (AWS/Azure/GCP), and evolve CI/CD pipelines with GitHub Actions
Design data models and drive database migrations and performance tuning for real-time workloads (PostgreSQL: connection pooling, indexing, query optimization)
Maintain a high testing bar (unit, integration, e2e), debug distributed systems in production with strong observability, and contribute to pragmatic, secure architecture decisions

Requirements

Have 5+ years of backend engineering experience building scalable, resilient systems in Node.js/TypeScript (with some Python)
Have hands-on production experience building LLM-based features: prompting, tool calling, structured outputs, eval frameworks, and handling real-world failure modes
Have proven experience deploying and operating services on Kubernetes within at least one major cloud provider (AWS, Azure, or GCP), with solid CI/CD practices
Have a strong testing culture (unit/integration/e2e), sharp debugging skills for microservices and distributed systems, and a focus on code quality
Are fluent in English, with a collaborative mindset and the drive to own problems end-to-end - from design to production

Nice to Have

Experience with speech pipelines (ASR, TTS, streaming audio) or voice agents
Familiarity with event-driven architectures and message brokers (Kafka, RabbitMQ, NATS, or Redis Streams), and hands-on PostgreSQL experience (EXPLAIN/ANALYZE, indexing strategies, connection pooling)
Interest in telephony and real-time communication (SIP, RTP, WebRTC) - no prior experience needed, we will teach you

We Offer

A Deutschlandticket (Germany-wide public transport pass) fully paid for by Doctolib
28 vacation days + 1 additional day for each full calendar year of employment (up to a maximum of 30 days)
Work from abroad for up to 10 days per year thanks to our flexibility days policy
Company health insurance with great supplementary benefits through our partner Allianz
Company pension scheme (bAV) through Allianz with an employer subsidy of 40% (15% within the probationary period)
The Doctolib Parent Care program, which includes one month additional parental leave and much more
Enrollment in Doctolib's long-term employee value sharing plan called DoctoGrowth
Free mental health and coaching services through our partner Moka.care
Subsidized sports membership through our partner Urban Sports Club
A flexible workplace policy offering both hybrid and office-based mode
Healthy snacks, regular breakfast buffet, and a subsidized meal benefit
Support for caregivers and workers with disabilities, including adaptation of the remote policy, extra days off for medical reasons, and psychological support
Relocation support in case of international mobility
Access to the best AI tools for coding, development, and dedicated training

Our Interview Process

Recruiter Interview
Live Coding Interview
System Design Interview
Behavioral Interview
At least one reference check

We want your experience to be clear, respectful, and transparent. Learn more about our hiring process on our candidate experience page.

Job Details

Position: Permanent
Tech stack: Node.js/TypeScript, Python, Kubernetes, AWS/Azure/GCP, PostgreSQL
Employment Type: Full-time
Location: Berlin
Work Setup: Hybrid (up to 2 remote days per week)
Start Date: As soon as possible

We Welcome Everyone

At Doctolib, we are committed to improving access to healthcare for everyone. This translates into our recruitment process. We evaluate candidates based solely on qualifications and motivation, without any form of discrimination.

The more diverse ideas are heard, the more our product will truly improve healthcare for all. You are welcome to apply to Doctolib, regardless of your gender, religion, age, sexual orientation, ethnicity, or disability.

To ensure equal opportunities, we invite you to exclude personal information (e.g., pictures, age) from your applications. If you require any accommodation, please let us know for support during the hiring process.

Join us in building the healthcare we all dream of!

Your Data Privacy

All information provided is processed by Doctolib for application management. For data processing details, click here: Germany | France | Italy | Netherlands. Please contact hr.dataprivacy(at)doctolib.com for inquiries or to exercise your rights.*

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

Job description