Senior Machine Learning Engineer

<h2 class="s-pb-2 s-pt-4 s-heading-xl s-text-foreground dark:s-text-foreground-night">Your Impact</h2> <div class="s-whitespace-pre-wrap s-break-words s-font-normal first:s-pt-0 last:s-pb-0 s-py-1 @md:s-pt-2 @md:s-pb-[10px] @md:s-leading-relaxed s-text-base s-leading-relaxed s-text-foreground dark:s-text-foreground-night">We are looking for a <strong class="s-font-semibold s-text-foreground dark:s-text-foreground-night">Senior Machine Learning Engineer</strong> to join the <strong class="s-font-semibold s-text-foreground dark:s-text-foreground-night">ML Engineering</strong> team in <strong class="s-font-semibold s-text-foreground dark:s-text-foreground-night">Patient Solutions</strong>.</div> <div class="s-whitespace-pre-wrap s-break-words s-font-normal first:s-pt-0 last:s-pb-0 s-py-1 @md:s-pt-2 @md:s-pb-[10px] @md:s-leading-relaxed s-text-base s-leading-relaxed s-text-foreground dark:s-text-foreground-night">Your mission will be to improve how people access quality care and manage their health over time by building and leading AI and ML systems that create real, measurable impact. You will work in a feature team developing intelligent patient-facing solutions, from smart practitioner discovery to long-term care management, playing a key technical role in shaping how we scale our AI capabilities across Europe.</div> <div class="s-whitespace-pre-wrap s-break-words s-font-normal first:s-pt-0 last:s-pb-0 s-py-1 @md:s-pt-2 @md:s-pb-[10px] @md:s-leading-relaxed s-text-base s-leading-relaxed s-text-foreground dark:s-text-foreground-night">Working in the tech team at Doctolib means building innovative products and features to improve the daily lives of care teams and patients.</div> <h2 class="s-pb-2 s-pt-4 s-heading-xl s-text-foreground dark:s-text-foreground-night">What you'll do</h2> <div class="s-whitespace-pre-wrap s-break-words s-font-normal first:s-pt-0 last:s-pb-0 s-py-1 @md:s-pt-2 @md:s-pb-[10px] @md:s-leading-relaxed s-text-base s-leading-relaxed s-text-foreground dark:s-text-foreground-night">Your responsibilities include but are not limited to:</div> <ul class="s-list-disc s-pb-2 s-pl-6 s-flex s-flex-col s-gap-1 s-text-foreground dark:s-text-foreground-night s-text-base s-leading-relaxed"> <li class="s-break-words s-text-foreground dark:s-text-foreground-night s-text-base s-leading-relaxed">Design and implement ML and AI solutions aligned with patient product goals, covering search, retrieval, and personalized care pathways</li> <li class="s-break-words s-text-foreground dark:s-text-foreground-night s-text-base s-leading-relaxed">Build and maintain large-scale retrieval pipelines, including hybrid search, embedding systems, vector databases, and multi-stage re-ranking architectures</li> <li class="s-break-words s-text-foreground dark:s-text-foreground-night s-text-base s-leading-relaxed">Develop, fine-tune, and evaluate LLM and VLM models using techniques such as knowledge distillation, Mixture-of-Experts (MoE) architectures, and prompt engineering</li> <li class="s-break-words s-text-foreground dark:s-text-foreground-night s-text-base s-leading-relaxed">Build and orchestrate agentic AI systems, integrating external data and capabilities through tools and MCP-based integrations</li> <li class="s-break-words s-text-foreground dark:s-text-foreground-night s-text-base s-leading-relaxed">Define metrics aligned with product goals, run controlled end-to-end experiments using W&amp;B, MLFlow, or Braintrust, and communicate findings to guide product and technical decisions</li> <li class="s-break-words s-text-foreground dark:s-text-foreground-night s-text-base s-leading-relaxed">Deploy solutions to production in collaboration with our ML platform team, ensuring reliability, observability, and performance at scale, and act as a technical reference to elevate the team's standards and practices</li> </ul> <h2 class="s-pb-2 s-pt-4 s-heading-xl s-text-foreground dark:s-text-foreground-night">Who you are</h2> <div class="s-whitespace-pre-wrap s-break-words s-font-normal first:s-pt-0 last:s-pb-0 s-py-1 @md:s-pt-2 @md:s-pb-[10px] @md:s-leading-relaxed s-text-base s-leading-relaxed s-text-foreground dark:s-text-foreground-night">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.</div> <div class="s-whitespace-pre-wrap s-break-words s-font-normal first:s-pt-0 last:s-pb-0 s-py-1 @md:s-pt-2 @md:s-pb-[10px] @md:s-leading-relaxed s-text-base s-leading-relaxed s-text-foreground dark:s-text-foreground-night"><strong class="s-font-semibold s-text-foreground dark:s-text-foreground-night">You'll be a great fit if you:</strong></div> <ul class="s-list-disc s-pb-2 s-pl-6 s-flex s-flex-col s-gap-1 s-text-foreground dark:s-text-foreground-night s-text-base s-leading-relaxed"> <li class="s-break-words s-text-foreground dark:s-text-foreground-night s-text-base s-leading-relaxed">You have 7+ years of experience in Machine Learning, Deep Learning, or AI Engineering, with a strong track record of taking models from prototype to production at scale</li> <li class="s-break-words s-text-foreground dark:s-text-foreground-night s-text-base s-leading-relaxed">You have strong experience in Information Retrieval and modern retrieval stacks: hybrid search (sparse + dense), large-scale embeddings and vector databases, multi-stage retrieval and re-ranking pipelines, RAG architectures, and tool/MCP-based integrations</li> <li class="s-break-words s-text-foreground dark:s-text-foreground-night s-text-base s-leading-relaxed">You are proficient in LLM and VLM application development: fine-tuning, MoE architectures (via LiteLLM or Model Garden), knowledge distillation, prompt engineering, and systematic benchmarking of LLM/VLM systems</li> <li class="s-break-words s-text-foreground dark:s-text-foreground-night s-text-base s-leading-relaxed">You have hands-on experience building and orchestrating agentic AI systems (e.g., using ADK)</li> <li class="s-break-words s-text-foreground dark:s-text-foreground-night s-text-base s-leading-relaxed">You demonstrate strong scientific rigor: designing metrics aligned with product goals, running controlled experiments, and communicating results clearly to both product and engineering stakeholders</li> <li class="s-break-words s-text-foreground dark:s-text-foreground-night s-text-base s-leading-relaxed">You have experience operating large-scale applications in production (monitoring, reliability, performance, observability), bring strong analytical skills, and approach your work with a user-first mindset. You are fluent in English</li> </ul> <div class="s-whitespace-pre-wrap s-break-words s-font-normal first:s-pt-0 last:s-pb-0 s-py-1 @md:s-pt-2 @md:s-pb-[10px] @md:s-leading-relaxed s-text-base s-leading-relaxed s-text-foreground dark:s-text-foreground-night"><strong class="s-font-semibold s-text-foreground dark:s-text-foreground-night">It would be fantastic if you:</strong></div> <ul class="s-list-disc s-pb-2 s-pl-6 s-flex s-flex-col s-gap-1 s-text-foreground dark:s-text-foreground-night s-text-base s-leading-relaxed"> <li class="s-break-words s-text-foreground dark:s-text-foreground-night s-text-base s-leading-relaxed">Have experience in B2C marketplace environments</li> <li class="s-break-words s-text-foreground dark:s-text-foreground-night s-text-base s-leading-relaxed">Have experience in other ML methodologies: pattern mining, recommendation systems, experimentation, or causal inference</li> </ul> <h2 class="s-pb-2 s-pt-4 s-heading-xl s-text-foreground dark:s-text-foreground-night">Life at Doctolib Tech</h2> <ul class="s-list-disc s-pb-2 s-pl-6 s-flex s-flex-col s-gap-1 s-text-foreground dark:s-text-foreground-night s-text-base s-leading-relaxed"> <li class="s-break-words s-text-foreground dark:s-text-foreground-night s-text-base s-leading-relaxed">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.</li> <li class="s-break-words s-text-foreground dark:s-text-foreground-night s-text-base s-leading-relaxed">Our stack is composed of Rails, TypeScript, Java, Python, Kotlin, Swift, and React Native.</li> <li class="s-break-words s-text-foreground dark:s-text-foreground-night s-text-base s-leading-relaxed">We leverage AI ethically across our products to empower patients and health professionals. Discover our AI vision&nbsp;<a class="s-break-all s-font-semibold s-transition-all s-duration-200 s-ease-in-out hover:s-underline s-text-highlight dark:s-text-highlight-night hover:s-text-highlight-400 dark:hover:s-text-highlight-400-night active:s-text-highlight-dark dark:active:s-text-highlight-dark-night" href="https://careers.doctolib.com/ai-careers/" target="_blank">here</a>.</li> </ul> <div class="s-whitespace-pre-wrap s-break-words s-font-normal first:s-pt-0 last:s-pb-0 s-py-1 @md:s-pt-2 @md:s-pb-[10px] @md:s-leading-relaxed s-text-base s-leading-relaxed s-text-foreground dark:s-text-foreground-night"><em>Want to learn more about our tech culture and environment? Visit the <a class="s-break-all s-font-semibold s-transition-all s-duration-200 s-ease-in-out hover:s-underline s-text-highlight dark:s-text-highlight-night hover:s-text-highlight-400 dark:hover:s-text-highlight-400-night active:s-text-highlight-dark dark:active:s-text-highlight-dark-night" href="https://careers.doctolib.com/tech-doctolib/" target="_blank">Doctolib Tech site</a>.</em></div> <h2 class="s-pb-2 s-pt-4 s-heading-xl s-text-foreground dark:s-text-foreground-night">What we offer</h2> <ul class="s-list-disc s-pb-2 s-pl-6 s-flex s-flex-col s-gap-1 s-text-foreground dark:s-text-foreground-night s-text-base s-leading-relaxed"> <li class="s-break-words s-text-foreground dark:s-text-foreground-night s-text-base s-leading-relaxed">Free comprehensive health insurance (basic package) for you and your children</li> <li class="s-break-words s-text-foreground dark:s-text-foreground-night s-text-base s-leading-relaxed">25 days of paid vacation per year, plus up to 14 days of RTT</li> <li class="s-break-words s-text-foreground dark:s-text-foreground-night s-text-base s-leading-relaxed">Free mental health and coaching services through our partner Moka.care</li> <li class="s-break-words s-text-foreground dark:s-text-foreground-night s-text-base s-leading-relaxed">Work from abroad for up to 10 days per year thanks to our flexibility days policy</li> <li class="s-break-words s-text-foreground dark:s-text-foreground-night s-text-base s-leading-relaxed">Lunch vouchers (Swile card) worth €8.50 per working day, with €4.50 covered by Doctolib</li> <li class="s-break-words s-text-foreground dark:s-text-foreground-night s-text-base s-leading-relaxed">A subsidy from the work council to refund part of the membership to a sport club or a creative class</li> <li class="s-break-words s-text-foreground dark:s-text-foreground-night s-text-base s-leading-relaxed">50% reimbursement of your public transport subscription</li> <li class="s-break-words s-text-foreground dark:s-text-foreground-night s-text-base s-leading-relaxed">Parent Care Program: receive one additional month of leave on top of the legal parental leave</li> <li class="s-break-words s-text-foreground dark:s-text-foreground-night s-text-base s-leading-relaxed">Enrollment in Doctolib's long-term employee value sharing plan called DoctoGrowth</li> <li class="s-break-words s-text-foreground dark:s-text-foreground-night s-text-base s-leading-relaxed">For caregivers and workers with disabilities, a package including an adaptation of the remote policy, extra days off for medical reasons, and psychological support</li> <li class="s-break-words s-text-foreground dark:s-text-foreground-night s-text-base s-leading-relaxed">Relocation support in case of international mobility</li> <li class="s-break-words s-text-foreground dark:s-text-foreground-night s-text-base s-leading-relaxed">Access to the best AI tools for coding, development and dedicated training</li> </ul> <h2 class="s-pb-2 s-pt-4 s-heading-xl s-text-foreground dark:s-text-foreground-night">Our interview process</h2> <ul class="s-list-disc s-pb-2 s-pl-6 s-flex s-flex-col s-gap-1 s-text-foreground dark:s-text-foreground-night s-text-base s-leading-relaxed"> <li class="s-break-words s-text-foreground dark:s-text-foreground-night s-text-base s-leading-relaxed">Recruiter Interview</li> <li class="s-break-words s-text-foreground dark:s-text-foreground-night s-text-base s-leading-relaxed">Feature Building Interview</li> <li class="s-break-words s-text-foreground dark:s-text-foreground-night s-text-base s-leading-relaxed">System Design Interview</li> <li class="s-break-words s-text-foreground dark:s-text-foreground-night s-text-base s-leading-relaxed">Behavioral Interview</li> <li class="s-break-words s-text-foreground dark:s-text-foreground-night s-text-base s-leading-relaxed">At least one reference check</li> </ul> <div class="s-whitespace-pre-wrap s-break-words s-font-normal first:s-pt-0 last:s-pb-0 s-py-1 @md:s-pt-2 @md:s-pb-[10px] @md:s-leading-relaxed s-text-base s-leading-relaxed s-text-foreground dark:s-text-foreground-night">We want your experience to be clear, respectful, and transparent. Learn more about our hiring process on our <a class="s-break-all s-font-semibold s-transition-all s-duration-200 s-ease-in-out hover:s-underline s-text-highlight dark:s-text-highlight-night hover:s-text-highlight-400 dark:hover:s-text-highlight-400-night active:s-text-highlight-dark dark:active:s-text-highlight-dark-night" href="https://careers.doctolib.com/tech-doctolib/getting-hired/" target="_blank">candidate experience page</a>.</div> <h2 class="s-pb-2 s-pt-4 s-heading-xl s-text-foreground dark:s-text-foreground-night">Job details</h2> <ul class="s-list-disc s-pb-2 s-pl-6 s-flex s-flex-col s-gap-1 s-text-foreground dark:s-text-foreground-night s-text-base s-leading-relaxed"> <li class="s-break-words s-text-foreground dark:s-text-foreground-night s-text-base s-leading-relaxed">Permanent position</li> <li class="s-break-words s-text-foreground dark:s-text-foreground-night s-text-base s-leading-relaxed">Full-time</li> <li class="s-break-words s-text-foreground dark:s-text-foreground-night s-text-base s-leading-relaxed">Location: Doctolib Paris office in Levallois-Perret</li> <li class="s-break-words s-text-foreground dark:s-text-foreground-night s-text-base s-leading-relaxed">Hybrid work setup (3 days/week in the office)</li> <li class="s-break-words s-text-foreground dark:s-text-foreground-night s-text-base s-leading-relaxed">Start date: as soon as possible</li> </ul> <h2 class="s-pb-2 s-pt-4 s-heading-xl s-text-foreground dark:s-text-foreground-night">We welcome everyone</h2> <div class="s-whitespace-pre-wrap s-break-words s-font-normal first:s-pt-0 last:s-pb-0 s-py-1 @md:s-pt-2 @md:s-pb-[10px] @md:s-leading-relaxed s-text-base s-leading-relaxed s-text-foreground dark:s-text-foreground-night">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.</div> <div class="s-whitespace-pre-wrap s-break-words s-font-normal first:s-pt-0 last:s-pb-0 s-py-1 @md:s-pt-2 @md:s-pb-[10px] @md:s-leading-relaxed s-text-base s-leading-relaxed s-text-foreground dark:s-text-foreground-night">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.</div> <div class="s-whitespace-pre-wrap s-break-words s-font-normal first:s-pt-0 last:s-pb-0 s-py-1 @md:s-pt-2 @md:s-pb-[10px] @md:s-leading-relaxed s-text-base s-leading-relaxed s-text-foreground dark:s-text-foreground-night">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.</div> <div class="s-whitespace-pre-wrap s-break-words s-font-normal first:s-pt-0 last:s-pb-0 s-py-1 @md:s-pt-2 @md:s-pb-[10px] @md:s-leading-relaxed s-text-base s-leading-relaxed s-text-foreground dark:s-text-foreground-night">Join us in building the healthcare we all dream of!</div> <h2 class="s-pb-2 s-pt-4 s-heading-xl s-text-foreground dark:s-text-foreground-night">Your data privacy</h2> <div class="s-whitespace-pre-wrap s-break-words s-font-normal first:s-pt-0 last:s-pb-0 s-py-1 @md:s-pt-2 @md:s-pb-[10px] @md:s-leading-relaxed s-text-base s-leading-relaxed s-text-foreground dark:s-text-foreground-night"><em>All information provided is processed by Doctolib for application management. For data processing details, click here: <a class="s-break-all s-font-semibold s-transition-all s-duration-200 s-ease-in-out hover:s-underline s-text-highlight dark:s-text-highlight-night hover:s-text-highlight-400 dark:hover:s-text-highlight-400-night active:s-text-highlight-dark dark:active:s-text-highlight-dark-night" href="https://doctolib.legal/B2C-Privacy-Policy-Career-FR" target="_blank">France</a>. Please contact hr.dataprivacy(at)doctolib.com for inquiries or to exercise your rights.</em></div>