Join our mission, join Doctolib! 

We are looking for a Senior AI Engineer to join the Patient Health Platform team in Paris. 

The Patient domain is at the heart of Doctolib's mission to help everyone be in better health. Our teams build the Health Companion that millions of people rely on every day - a seamless, AI-powered experience that empowers patients to take an active role in their own health journey.

Within the Patient domain, two streams drive this vision forward:

• Find Your Practitioner (FYP) focuses on making access to care faster, easier, and smarter. From our practitioner directory and online booking to intelligent care search assistance, FYP ensures that every patient can find the right professional at the right time.
• Preventive & Continuous Care Companion (P3C) goes beyond the consultation room. This stream builds the tools that help people prevent health issues before they arise, stay connected with their care team between appointments, and manage their health over time - through personalised health tracking, prevention campaigns, care plans, and AI-powered health guidance.

Together, these two streams shape a product that is not just a booking tool, but a true companion for health - recommended by practitioners and trusted by patients.

Your responsibilities include but are not limited to:

• Design and build the production search & recommendation architecture: full retrieval, ranking, reranking pipeline with standard and off-the-shelf components (vector search, semantic retrieval, LLM/managed rerankers).
• Establish strong baselines first (prompts, RAG, model selection) before reaching for custom ML.
• Build evaluation and observability into every stage, with offline and online evaluation.
• Set up the data/event feedback loops that drive iteration and feed deeper ML later.
• Improve search relevance and ranking on Patient facing products , raising result quality
• Own production quality: latency reliability, monitoring, and maintainability.
• Partner with ML Engineers and collaborate closely with PMs and SWEs to define, build, and ship AI-powered features that deliver measurable value to users and the business. 

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 could be our next team mate if you have:

1. Production deployment: ability to ship algorithms to production (ECS-based service on AWS)
2. Strong analytical mindset: result-oriented,  patient-first approach
3. Significant experience as a Software or/and AI engineer shipping search or recommendation systems to production. 
4. Hands-on experience building end-to-end retrieval: ranking,  reranking pipelines and familiar with nDCG, MAP, Recall@k, MRR
5. AI-engineering proficiency: turning foundation models and off-the-shelf components into production systems: embeddings & vector search, semantic retrieval, RAG, LLM-based or managed rerankers (e.g. Vertex AI). You can succeed without training a model from scratch
6. Architecture-first approach: you build the system, baselines, evals, and feedback loops with standard tooling before reaching for custom ML, and know when to partner with ML Engineers to break a ceiling
7. Evaluation & observability built into every stage (retrieval, ranker, reranker) — offline and online eval, A/B testing, position-bias handling, monitoring
8. Production deployment — ability to ship reliable, low-latency services to production (hundreds-of-ms SLAs), with care for data quality and long-term maintainability

Now, it would be fantastic if you:

• Experience at a B2C marketplace (e-commerce, hospitality, travel)
• Additional ML methodologies: pattern mining, recommendation systems, experimentation, or causal inference
• Have experience with search engines or information retrieval concepts
• Have exposure to learning-to-rank or feature engineering (for breaking ceilings later, alongside ML Engineers)
• Have experience in a healthcare or other regulated domain (GDPR / HDS)

What we offer

• Free comprehensive health insurance (basic package) 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 (Swile card) worth €8.50 per working day, with €4.50 covered by Doctolib
• A subsidy from the work council to refund part of the membership to a sport club or a creative class
• 50% reimbursement of your public transport subscription
• Enrollment in Doctolib's long-term employee value sharing plan called DoctoGrowth
• Parent Care Program: receive one additional month of leave on top of the legal parental leave
• For caregivers and workers with disabilities, a package including an adaptation of the remote policy, extra days off for medical reasons, and psychological support

The interview process 

• A first interview with a member of the Talent Acquisition team
• A coding interview
• An agentics system design 
• A final interview 
• Reference check 

Job details

• Permanent position
• Full Time 
• Workplace: Levallois
• Start date : As soon as possible

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, 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!

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