Full-Time
Senior Machine Learning Engineer
Applied AI & LLMs
Updated on 8/22/2026
Doctolib
1,001-5,000 employees
Online appointment booking and teleconsultation platform
No salary listed
Paris, France
Hybrid
Three days on-site per week required.
 AI & Machine Learning (1) |
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- 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.
- 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.
- You are proficient in LLM and VLM application development: fine-tuning, Mixture-of-Experts architectures via LiteLLM or Model Garden, knowledge distillation, prompt engineering, and systematic benchmarking of LLM/VLM systems.
- You have hands-on experience building and orchestrating agentic AI systems, for example using ADK.
- You demonstrate strong scientific rigor by designing metrics aligned with product goals, running controlled experiments, and communicating results clearly to product and engineering stakeholders.
- You have experience operating large-scale applications in production, including monitoring, reliability, performance, and observability, and bring strong analytical skills and a user-first mindset.
- You are fluent in English.
- Design and implement machine learning and artificial intelligence solutions aligned with patient product goals, covering search, retrieval, and personalized care pathways.
- Build and maintain large-scale retrieval pipelines, including hybrid search, embedding systems, vector databases, and multi-stage re-ranking architectures.
- Develop, fine-tune, and evaluate large language models and vision-language models using knowledge distillation, Mixture-of-Experts architectures, and prompt engineering.
- Build and orchestrate agentic artificial intelligence systems, integrating external data and capabilities through tools and MCP-based integrations.
- Define metrics aligned with product goals, run controlled end-to-end experiments using W&B, MLFlow, or Braintrust, and communicate findings to guide product and technical decisions.
- Deploy solutions to production in collaboration with the machine learning platform team, ensuring reliability, observability, and performance at scale.
- Act as a technical reference to elevate the team's standards and practices.
- Experience in B2C marketplace environments.
- Experience in other machine learning methodologies, including pattern mining, recommendation systems, experimentation, or causal inference.
Doctolib runs a digital healthcare platform that connects patients with healthcare professionals, mainly in France, Germany, and Italy. It provides online appointment booking, teleconsultation, and practice-management tools through subscription-based software for medical practices, hospitals, and individual clinicians. The platform helps patients find and book care quickly while giving providers a centralized system to manage schedules, patient communications, and administrative tasks. Unlike many options that focus on one feature, Doctolib combines patient access with practice management in a single solution, serving multiple types of healthcare clients across several European countries. The company’s goal is to make healthcare more efficient and easier to access by streamlining operations for providers and reducing barriers to care for patients, using a scalable subscription model to grow across markets.
Company Size
1,001-5,000
Company Stage
Debt Financing
Total Funding
$810.9M
Headquarters
Levallois-Perret, France
Founded
2013
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Simplify's Take
What believers are saying
- Doctolib bought Medicus in May 2026 and committed over £100 million.
- The company launched Care Forward with AP-HP and Roche in April 2026.
- A €300 million secondary sale in April 2026 showed continuing employee and investor demand.
What critics are saying
- The French Competition Authority fined Doctolib €4.665 million in November 2025.
- That ruling weaponizes future acquisitions under competition scrutiny, especially smaller rivals.
- A failed UK rollout against NHS incumbents would expose Doctolib's cross-border expansion thesis.
What makes Doctolib unique
- Doctolib dominates France, Germany, and Italy with sticky provider workflow software.
- Its product spans booking, teleconsultation, and practice management, reducing switching incentives.
- The 2026 Medicus acquisition gives Doctolib NHS access and London engineering talent.
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Benefits
Hybrid Work Options
Phone/Internet Stipend
Wellness Program
Professional Development Budget
Flexible Work Hours
Health Insurance
Paid Vacation
Paid Sick Leave
Paid Holidays
Parental Leave
Mental Health Support
Meal Benefits
Growth & Insights and Company News
6 month growth
↓ -1%1 year growth
↓ -1%2 year growth
↓ -1%TECH | Doctolib gets a foothold in the United Kingdom. Published on May 7, 2026 at 4:02 PM, updated on May 7, 2026 at 4:03 PM | 589 words The unicorn Doctolib takes a foothold across the Channel with the acquisition... After the acquisition of Italian Dottori.it in 2021, Dutch Siilo in 2023 and German Aaron.ai in 2024, the French unicorn Doctolib is setting up in the United Kingdom with the acquisition of Medicus (...) To access this article, the entire site and our databases, discover our subscription plans. BioTech, FinTech, MedTech... Follow all the deals and movements of TECH on social networks.
The French scaleup says plans to hire 150 people and open a R&D centre in London
Doctolib, AP-HP and Roche have launched Care Forward, a support programme for European healthtech startups at STATION F in Paris. The initiative aims to bridge the gap between healthcare innovation and clinical deployment by providing startups with direct access to hospital environments, regulatory expertise and AI support. The programme targets startups developing technologies across the care pathway, including digital solutions, AI, connected devices and healthcare services. Doctolib will offer technology integration and European deployment strategies, whilst AP-HP provides access to clinical environments across Europe's largest university hospital system with 38 hospitals. Roche will assist with regulatory navigation and health economic validation. Participating startups will also gain access to specialised investors and exclusive industry events. Applications are open until 15 May.
Care Forward: Doctolib, @Hôtel-Dieu (AP-HP), and Roche join forces at STATION F. Three major health players launched "Care Forward" at STATION F to help Europe's next-gen health startups move faster and scale from concept to real clinical adoption. Published on Apr 17, 2026 We're excited to announce the launch of a new program in the health space, led by Doctolib, @Hôtel-Dieu (AP-HP), and Roche. The goal is simple: bring health innovations closer to where they matter most: patients and care teams. Based at STATION F, the "Care Forward" program is open to European startups with the potential to deliver clear, measurable impact on the healthcare system. The focus is straightforward but demanding: solutions that work in practice. Whether building in digital health, AI, connected devices, or care services, selected startups will be supported to test, validate, and deploy their solutions in real clinical environments. From diagnosis and treatment to follow-up and system efficiency, all parts of the care pathway are in scope, as long as the impact is concrete. Direct access to technology, clinicians, and patients. What sets this program apart is not just mentorship or office space, it's proximity. Selected startups will receive tailored, hands-on support from three key players in European healthcare: * Doctolib will bring its deep expertise in product integration, AI in healthcare, and practitioner workflows, helping startups build solutions that can scale across Europe and truly fit into daily medical practice. * @Hôtel-Dieu (AP-HP) will open the doors of Europe's largest university hospital system. Startups will gain access to innovation platforms and clinical environments, and leverage the expertise of professionals across the 38 hospitals of AP-HP, to ground their solutions in real needs. * Roche will support founders in navigating regulatory pathways, demonstrating health economic value, and connecting with a global network of scientific and medical experts. Beyond this, participants will meet specialized investors, engage with industry stakeholders, and gain access to key events across Europe's health ecosystem. Bridging innovation and adoption. As Doctolib's Managing Director France, Jean-Urbain Hubau, puts it: "Our healthtech ecosystem is full of talent, but the real challenge remains scaling and adoption by healthcare professionals." For @Hôtel-Dieu (AP-HP), the initiative also reflects a broader ambition: bringing innovation closer to care delivery. As Nicolas Castoldi, Deputy Director to the CEO of AP-HP and Executive Director of the @Hôtel-Dieu initiative, notes, it builds on the transformation of the Hôtel-Dieu hospital into a major innovation hub; one rooted in both history and forward-looking healthcare. And for Roche, the logic is ecosystem-driven. As President Jean-François Brochard emphasizes, shaping the future of health requires coordinated partnerships where startups and established players work side by side to improve care pathways and system efficiency. Selected startups will join the program following the application phase, which runs until May 15th, and will be announced shortly afterwards at a dedicated event at STATION F. Applications are open here. Media & press relations Looking for press resources? Download our press kit and get in touch with our media team.
Podiatech and Doctolib: an obvious partnership. To best support podiatry practices, Podiatech and Doctolib have joined forces to create a useful offering tailored to the needs of healthcare professionals. The goal is clear: to enable practitioners to grow their practice while improving their work-life balance. Through its online consultation management service, the platform makes it easier to connect with patients and helps reduce missed appointments. Many tasks are simplified, and the administrative workload is reduced. Doctolib X Podiatech by the numbers: * 8,000 podiatrists supported * 60% of appointments booked directly online * An average of 20 new patients per month * 500,000 appointments booked each month with podiatrists This partnership marks an important milestone for Podiatech, demonstrating its role as a key player in the day-to-day life of practices across France. Sidas Academy Events Tuesday 17 March 2026 Sidas Athletes Friday 13 March 2026