Senior AI Engineer - Patient Team (x/f/m)

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 need, receives better care from health professionals, and can actively prevent health problems to improve their wellbeing.You’ll design the search and recommendation engines behind our health companion, helping 100M patients across Europe instantly navigate to the exact care they need while delivering trusted, curated insights at every step. The retrieval and recommendation architecture you own will directly shape how relevant, fast, and trustworthy that experience is for every one of them.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 qualityOwn 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 areBefore 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:Production deployment: ability to ship algorithms to production (ECS-based service on AWS)Strong analytical mindset: result-oriented, patient-first approachSignificant experience as a Software or/and AI engineer shipping search or recommendation systems to production. Hands-on experience building end-to-end retrieval: ranking, reranking pipelines and familiar with nDCG, MAP, Voir email sur click.jobroute.io, MRRAI-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 scratchArchitecture-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 ceilingEvaluation & observability built into every stage (retrieval, ranker, reranker) — offline and online eval, A/B testing, position-bias handling, monitoringProduction deployment — ability to ship reliable, low-latency services to production (hundreds-of-ms SLAs), with care for data quality and long-term maintainabilityNow, 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 inferenceHave experience with search engines or information retrieval conceptsHave 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)Life at Doctolib TechOur solutions are built on a single, fully cloud-native platform that supports web and mobile app interfaces, multiple languages, and is adapted to country and healthcare specialty requirements.Our stack is composed of Rails, TypeScript, Java, Python, Kotlin, Swift, and React Native.We leverage AI ethically across our products to empower patients and health professionals. Discover our AI vision here.We also invest in open, applied AI research. For example, our DoctoBERT project introduces open-source medical language models trained for French clinical text, with applications in named entity recognition, classification, and retrieval. Read the DoctoBERT practical guide to learn more about how we bring deep AI research into practical healthcare applications.Want to learn more about our tech culture and environment? Visit the Doctolib Tech site.What we offerFree comprehensive health insurance (basic package) for you and your children25 days of paid vacation per year, plus up to 14 days of RTTFree mental health and coaching services through our partner Moka.careWork from abroad for up to 10 days per year thanks to our flexibility days policyLunch vouchers (Swile card) worth 8.50 per working day, with 4.50 covered by DoctolibA subsidy from the work council to refund part of the membership to a sport club or a creative class50% reimbursement of your public transport subscriptionEnrollment in Doctolib's long-term employee value sharing plan called DoctoGrowthParentCare Program: Enjoy full salary coverage (100%) during your first month of birth leave, and 75% during the second, covered by DoctolibFor caregivers and workers with disabilities, a package including an adaptation of the remote policy, extra days off for medical reasons, and psychological supportThe interview process A first interview with a member of the Talent Acquisition teamA coding interviewAn agentics system design A behavioural interview Reference check Job detailsPermanent positionFull Time Workplace: LevalloisStart date : As soon as possibleAt 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!All information provided is processed by Doctolib for application management. For data processing details, click here: Germany l France l Italy l Netherlands. Please contact hr.dataprivacy(at)doctolib.com to exercise your rights.