Principal Machine Learning Engineer - Applied AI & LLMs (x/f/m)
DoctolibParis, Île-de-France, France · Posted 3 months agoDescription
What you’ll do
We are looking for a Principal Machine Learning Engineer to join the DS & AI organization at Doctolib. This is a transversal force multiplier role operating across all AI teams: Clinical, Productivity, Phone Assistant and ASR. Rather than working within a single feature team, you will own the cross-cutting technical challenges: defining how Doctolib's product and AI teams build agentic solutions, standardizing ML evaluation frameworks, and spreading strong engineering practices across the org. You will unblock teams, shape architecture decisions, and take on the deep technical work that requires senior ML judgment at scale, directly impacting the daily lives of 400,000 healthcare professionals and the health of 80 million patients. Building at Doctolib means delivering innovative products that measurably improve outcomes for care teams and patients alike.
Technical Strategy & Architecture
- Own cross-team ML architecture decisions, from model selection to production deployment patterns and strategic build vs. buy decisions
- Define and drive adoption of rigorous evaluation frameworks across all AI teams, setting the standard for how Doctolib measures model and agentic performance
- Establish shared production infrastructure patterns for AI: model and prompt versioning, guardrails, uncertainty quantification, cost optimization, and observability
- Lead the technical design of agentic solutions and define how product teams across Doctolib build on top of AI capabilities
- Elevate technical standards across the DS & AI org by influencing Staff and Senior ML Engineers through architecture reviews, technical guidance, and practice propagation
- Partner with Product, Legal, and Compliance teams to ensure safe rollout and meet EU regulatory expectations (GDPR, MDR, EU AI Act)
Who you are
Before you read on, if you don't have the exact profile described below, but you feel this job description matches your skill set, we still encourage you to apply.
You'll be a great fit if:
- You have 10+ years in ML/AI with 3+ years at Staff+ or Principal level leading complex, multi-team technical initiatives
- You have deep expertise in at least two of: clinical NLP, LLM fine-tuning and evaluation, automatic speech recognition, RAG systems, or reinforcement learning
- You are expert in Python, PyTorch/Transformers for training, and vLLM for inference with a track record deploying ML systems in production (AWS/GCP)
- You have a PhD in Computer Science, AI, Statistics, or related field (or equivalent research experience)
- You have exceptional communication skills and are able to align diverse stakeholders and explain complex technical decisions
Now it would be fantastic if you have:
- Publications in top-tier ML/AI conferences (NeurIPS, ICLR, ACL) or medical informatics venues
- Experience with EU healthcare regulations (GDPR, MDR, AI Act)
- Prior work with clinical data or healthcare applications
Life at Doctolib Tech
- Our solutions are built on a single fully cloud-native platform supporting web and mobile interfaces across multiple languages and healthcare specialties.
- Our stack includes Rails, TypeScript, Java, Python, Kotlin, Swift, and React Native.
- We leverage AI ethically to empower patients and professionals. Discover our AI vision here.
Want to learn more about our tech culture and environment? Visit the Doctolib Tech site.
What we offer
- Free comprehensive health insurance for you and your children
- 25 days of paid vacation per year, plus up to 14 days of RTT
- Free mental health and coaching services through our partner Moka.care
- Work from abroad for up to 10 days per year thanks to our flexibility days policy
- Lunch vouchers with Swile card (€8.50 value, €4.50 covered by Doctolib)
- Work Council subsidy for sports club memberships or creative classes
- 50% reimbursement of your public transport subscription
- Parent Care Program: one additional month of leave on top of legal parental leave
- For caregivers and workers with disabilities: remote policy adaptation, extra medical leave, and psychological support
- Relocation support for international mobility
- Access to premium AI tools for development and dedicated training
The interview process
- HR Screen
- Hiring Manager Interview
- Technical Interview
- Technical Case Study
- Behavioral Interview
- At least one reference check
We want your experience to be clear, respectful, and transparent. Learn more on our candidate experience page.
Job details
- Permanent position
- Full-time
- Paris, France
- Hybrid work mode (up to 2 remote days per week)
- Start date: as soon as possible
We welcome everyone
At Doctolib, we believe in improving access to healthcare for everyone - regardless of where you come from or what you look like. We evaluate candidates based solely on qualifications and motivation, without any form of discrimination. We respect and celebrate diversity!
The more diverse ideas are heard, the more our product will truly improve healthcare for all. You are welcome to apply regardless of gender, religion, age, sexual orientation, ethnicity, disability, or place of origin.
To ensure equal opportunities, we invite you to exclude personal information (e.g., pictures, age) from your applications. If you have a disability, let us know if there's any way we can make the interview process smoother for you! Join us in building the healthcare we all dream of.
Your data privacy
All information transmitted via this form is processed by Doctolib for application management. For more on how we process your data, click here. For inquiries or to exercise your rights, contact us at hr.dataprivacy(at)doctolib.com.
Similar jobs
Est. 120,000 EUR
What you’ll do We are looking for a Senior Staff Machine Learning Engineer to join the Clinical team in the AI and Machine Learning Department. You'll lead the technical direction of AI systems that enhance clinical deci…
Est. 90,000 EUR
We are looking for a Staff Data Engineer - AI to join the AI team at Doctolib. As a Staff Data Engineer AI, your mission will be to build robust data pipelines - from data capture to monitoring - to power our AI systems…
Est. 80,000 EUR
Set a new pulse for healthcare! We are looking for a Staff Machine Learning Engineer - Retrieval to join our AI team working on Clinical decision support and Medical Knowledge. Your mission will be to ground clinical AI…
Est. 90,000 EUR
Your Impact We are looking for a Senior MLOps Engineer to join the Panda Team (Data & ML Operations) in Data & AI Platform team. Your mission will be to build and maintain secure ML pipelines in production, trans…
Est. 120,000 EUR
The opportunity Founded in 2013, Doctolib is Europe's leading AI and digital health company, serving 520,000 health professionals and 90 million people. We are turning our patient-facing product into Europe's first broad…
Est. 65,000 EUR
Set a new pulse for healthcare! We are looking for a Research Scientist to join the Doctolab team (Doctolib Clinical AI Research Lab). Your mission is to build accurate, well-calibrated, and clinically reliable models of…
Est. 80,000 EUR
We are looking for a Senior Medical Lead to join our Medical Excellence team. At Doctolib, we're setting a new pulse for healthcare. We create AI-powered solutions that help health professionals deliver better care, and…
Est. 120,000 EUR
Your Impact We are looking for a Staff DataOps Engineer to join the Data and AI Platform team. Your mission will be to shape our data platform strategy and architecture, driving enterprise-scale solutions that accelerate…
Est. 80,000 EUR
Set a new pulse for healthcare! We are looking for a Senior Machine Learning Engineer to join the Orchestration team in AI Health Assistant. Your mission will be to ensure our AI Health Companion behaves safely, reliably…
Est. 90,000 EUR
Join our mission, join Doctolib! We are looking for a Senior AI Engineer to join the Patient team in Paris. The Patient domain sits at the heart of Doctolib's mission: ensuring everyone has better access to the care they…
Est. 80,000 EUR
We are looking for a Java Software Engineer, with strong experience in Java and Spring Boot, to join Doctolib’s Platform team, ATP. The team builds the backend foundations that power our distributed services. Java and Sp…
Est. 61,500 EUR
Your Impact We are looking for a Fullstack Software Engineer to join the PAX (Patient App Experience) team, working at the heart of Doctolib’s patient experience. The team builds and evolves key patient-facing features,…
Est. 120,000 EUR
Your Impact We are looking for a Senior Machine Learning Engineer to join the ML Engineering team in Patient Solutions. Your mission will be to improve how people access quality care and manage their health over time by…
Est. 66,500 EUR
Set a new pulse for healthcare! We are looking for a Senior or Staff AI Engineer to join the Remote Care stream at Doctolib. Your mission will be to build AI-powered tools that transform how healthcare professionals deli…
Est. 80,000 EUR
What we do Join a team of passionate and hardworking entrepreneurs to transform healthcare! Working in the tech team at Doctolib involves building innovative products and features to improve the daily lives of care teams…
Est. 85,000 EUR
Your Impact We are looking for a Senior Site Reliability Engineer to join our SRE team dedicated to platform reliability within Platform Engineering. Your mission will be to ensure Doctolib's platform remains reliable, s…
Est. 120,000 EUR
Your Impact We are looking for an Engineering Manager to lead an SRE team dedicated to platform reliability and observability within Platform Engineering. Your mission will be to grow and lead a team of Site Reliability…
Est. 90,000 EUR
Your Impact We are looking for a Staff Site Reliability Engineer to join our SRE team dedicated to platform reliability within Platform Engineering. Your mission will be to act as a technical leader driving Doctolib's re…
Est. 120,000 EUR
We are looking for an Engineering Manager to join the Business Performance Team in Berlin. Your mission will be to enable seamless, secure connectivity between healthcare systems by building and scaling Doctolib's self-s…
Est. 80,000 EUR
Your Impact We are looking for a Senior AI Engineer to join the Customer Care Contact team in the Business Performance domain. Your mission will be to build AI-powered tools that revolutionize how healthcare professional…
Est. 90,000 EUR
Set a new pulse for healthcare! We are looking for a Senior Corporate Security Engineer to join the Corporate Security team in SecOps. Your mission will be to secure everything Doctolibers rely on to do their best work i…
Est. 80,000 EUR
Doctolib is looking for a Workday Integration & Analytics Engineer to join its People Systems & Performance (PSP) team. You will own the data and integration layer of Doctolib's HR tech stack and reporting capabi…
Est. 120,000 EUR
Set a new pulse for healthcare! We are looking for an Engineering Manager to join the Scheduling team in Berlin. Your mission will be to give practitioners their day back: reclaiming the admin time they spend creating an…
Est. 70,000 EUR
Join ACAI (Advanced Calendar Improvement), a team dedicated to making day-to-day practice operations more efficient and less mentally exhausting for healthcare professionals and their teams. Practice operations are often…
Est. 80,000 EUR
We are looking for a Senior DataOps Engineer to join the Data and AI Platform team. Your mission will be to improve and maintain an efficient, reliable and scalable platform that enables Data Product developers and owner…
Est. 120,000 EUR
About the Team The IT Core Finance squad owns and runs the information systems that power Doctolib's Finance function across France, Germany, Italy and the Netherlands: Accounting (GL, AP, AR), Sourcing & Procurement…
Est. 80,000 EUR
Your Impact We are looking for a Senior Data Engineer to join the AI Team working on our AI Medical Companion. Your mission will be to build and optimize the data foundations that power safe, scalable, and impactful AI m…
Est. 90,000 EUR
Your Impact We are looking for a Senior Site Reliability Engineer to join our SRE team dedicated to platform reliability within Platform Engineering. Your mission will be to ensure Doctolib's platform remains reliable, s…
Est. 120,000 EUR
What we do Join a team of passionate and hardworking entrepreneurs to transform healthcare! Working in the tech team at Doctolib involves building innovative products and features to improve the daily lives of care teams…
Est. 120,000 EUR
Set a new pulse for healthcare! We are looking for a Head of Design Systems to join the Brand and Design team at Doctolib. Your mission will be to ensure every Doctolib product surface is built on a consistent, high-qual…