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Full-time
Comprehensive Health Insurance, Paid Vacation, RTT Days, Mental Health and Coaching Services, Work From Abroad Flexibility, Lunch Vouchers
Posted 7d ago
~40 hrs/week
Responsibilities
Build and own the Medical Knowledge Platform to ground clinical AI decisions in validated medical sources. Design and maintain indexing pipelines and retrieval systems at scale, handling millions of documents with low latency.
Requirements
Requires proven production experience scaling search and retrieval systems and deep expertise in both offline indexing and online retrieval. Candidates should be hands-on with tools like Elasticsearch and Vertex AI and have operated at a Senior or Staff level.
Full job description
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 decisions in validated, trusted medical sources from HAS guidelines and learned society recommendations to peer-reviewed clinical studies. You will work in a feature team developing Doctolib's Medical Knowledge Platform, contributing directly to the reliability and safety of AI-powered healthcare experiences used by hundreds of thousands of health professionals and millions of patients across Europe.
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 own Doctolib's Medical Knowledge Platform, designing the systems that ground clinical AI decisions in validated medical sources (HAS guidelines, learned society recommendations, clinical studies)
Design and maintain both indexing pipelines and retrieval systems, ensuring end-to-end ownership across the full retrieval stack
Operate at scale: architect and optimize systems handling 100M+ documents, 50+ req/s, and sub-300ms latency requirements
Engineer deep RAG systems from the ground up - going well beyond off-the-shelf components to tackle real medical knowledge complexity
Work across the full retrieval stack: vector embeddings, vector search, re-ranking, query expansion and rewriting
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 proven production experience building and scaling search & retrieval systems in a real-world, high-traffic environment
Bring deep dual expertise in both offline indexing and online retrieval; you own the full pipeline, not just one side of it.
Are genuinely hands-on with the retrieval tech stack: Elasticsearch, Solr, Vertex AI, vector search, embeddings, re-ranking and query processing.
Have gone beyond commodity RAG; you've built custom re-rankers, optimized indexing pipelines, or engineered query processing solutions that required real technical depth.
Have operated at Senior or Staff level, with the autonomy and technical depth that comes with it.
It would be fantastic if you:
Have experience working with medical knowledge sources, clinical databases, or healthcare information systems
Have contributed to evaluation frameworks and benchmarks for retrieval quality or AI outputs in regulated or high-stakes environments
Have worked in a multi-lingual retrieval context or with domain-specific ontologies
Life at Doctolib Tech
Our 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.
Want to learn more about our tech culture and environment? Visit theDoctolib Tech site.
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
ParentCare Program: Enjoy full salary coverage (100%) during your first month of birth leave and 75% during the second, covered by Doctolib
Enrollment in Doctolib's long-term employee value sharing plan called DoctoGrowth
For caregivers and workers with disabilities, a package including an 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 Screen (45')
Live Coding Interview (75')
System Design Interview (75')
Behavioural Interview (75')
Reference Check & Offer
We want your experience to be clear, respectful, and transparent. Learn more about our hiring process on our candidate experience page.
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, clickici. Please contact hr.dataprivacy(at)doctolib.com for inquiries or to exercise your rights.
We’re a B Corp company committed to build together the healthcare we all dream of.
More than 2,900 Doctolibers in France, Germany, Italy, and the Netherlands are helping to improve the daily lives of care teams with a new generation of technologies and services.
At the same time, Doctolib is helping over 80 million patients to effectively manage their health and provide quick and easy access to optimal healthcare.
Offices: 54, Quai Charles Pasqua, Levallois-Perret, Île-de-France 92300, FR · Mehringdamm, 51, Berlin, Berlin 10961, DE · Via Vittor Pisani 19, Milano, IT · 17, Boulevard de Berlin, Whoorks, Nantes, Pays de la Loire 44000, FR · 362, Avenue de Limoges, Niort, Nouvelle-Aquitaine 79000, FR
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