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DDoctolib
Doctolib•HealthTech

Principal Machine Learning Engineer - Applied AI & LLMs

Location

Paris, Paris, France

Work type

Hybrid

Employment

Full Time

Experience

10-15 years

Compensation

Compensation not disclosed

Posted

8h ago

Summary and responsibilities

Role overview

Summary

This Principal Machine Learning Engineer role at Doctolib involves leading cross-cutting technical challenges across all AI teams, defining ML architecture, standardizing evaluation frameworks, and spreading strong engineering practices. The position requires deep expertise in ML/AI, particularly with LLMs, and a focus on building innovative, impactful products for healthcare professionals and patients.

About the Role

Doctolib is seeking a Principal Machine Learning Engineer to join its Data Science and AI organization in Paris, France. This cross-functional role will drive technical strategy, architecture, and engineering standards across Clinical AI, Productivity, Phone Assistant, and Automatic Speech Recognition (ASR) teams. You will solve complex machine learning challenges, develop scalable AI infrastructure, and guide teams in building reliable, safe, and effective AI solutions that improve healthcare experiences for 400,000 healthcare professionals and 80 million patients.

Responsibilities

Technical Strategy and Architecture

Lead cross-team ML architecture decisions, covering model selection, production deployment, and build-versus-buy strategies. Develop standardized evaluation frameworks for machine learning models and AI agents, and establish production infrastructure standards for model and prompt versioning, guardrails, uncertainty quantification, cost optimization, and observability.

Lead the technical design of agentic AI solutions and define reusable AI capabilities for product teams. Conduct architecture reviews, guide Staff and Senior ML Engineers, and promote engineering best practices across the Data Science and AI organization. Collaborate with Product, Legal, and Compliance teams to ensure safe AI deployment and compliance with GDPR, MDR, and the EU AI Act.

Requirements

You should have at least 10 years of experience in machine learning and AI, including three or more years in Staff-level, Principal-level, or equivalent technical leadership roles. You must demonstrate experience leading complex technical initiatives across multiple teams and possess deep expertise in at least two areas: clinical NLP, LLM fine-tuning and evaluation, automatic speech recognition, retrieval-augmented generation (RAG), or reinforcement learning.

Advanced Python skills and expertise in PyTorch, Transformers, and vLLM are essential, alongside proven experience deploying production ML systems on AWS or GCP. A PhD in Computer Science, AI, Statistics, or a related field is preferred, or equivalent research experience. Excellent communication skills and the ability to align stakeholders and explain complex technical decisions are also required.

Nice to Have

Publications at leading AI and ML conferences, such as NeurIPS, ICLR, or ACL, or in medical informatics are advantageous. Experience with European healthcare regulations, including GDPR, MDR, and the EU AI Act, as well as previous work with clinical data or healthcare applications, is also desirable.

About Doctolib Tech

Doctolib develops a cloud-native healthcare platform supporting web and mobile applications across multiple languages and medical specialties. Its technology stack includes Rails, TypeScript, Java, Python, Kotlin, Swift, and React Native. The company is committed to using AI responsibly to empower healthcare professionals and patients.

What We Offer

Doctolib provides comprehensive health insurance for employees and their children, 25 days of paid annual leave plus up to 14 RTT days, and free mental health and coaching services through Moka.care. Employees can work abroad for up to 10 days annually and receive lunch vouchers worth €8.50, with €4.50 covered by Doctolib.

Additional benefits include subsidies for sports memberships and creative classes, 50% reimbursement of public transport subscriptions, and an additional month of parental leave through the Parent Care Program. Support for caregivers and employees with disabilities includes adapted remote-working arrangements, additional medical leave, and psychological support. Relocation assistance, premium AI development tools, and dedicated training are also available.

Interview Process

The recruitment process includes HR screening, a hiring manager interview, a technical interview, a technical case study, a behavioral interview, and at least one reference check.

Job Details

Position: Principal Machine Learning Engineer
Employment Type: Permanent, full-time
Location: Paris, France
Work Mode: Hybrid, with up to two remote days per week
Start Date: As soon as possible

Equal Opportunity and Data Privacy

Doctolib welcomes applicants from all backgrounds and evaluates candidates based on their qualifications and motivation. Reasonable adjustments are available to support candidates with disabilities during recruitment.

Candidate information is processed for recruitment purposes in accordance with Doctolib's data privacy policies.

Updated 8h ago

Candidate fit

Skills and qualifications

Additional skills

LLM fine-tuning • 1+ yrs
RAG systems • 1+ yrs
Python • 1+ yrs
PyTorch • 1+ yrs
Transformers • 1+ yrs
vLLM • 1+ yrs
AWS/GCP • 1+ yrs
Communication • 1+ yrs

Experience

10-15 years

How this role is positioned

Role classification

Job domains

Engineering

Industries

Healthcare & Pharma

Employment

Full Time

Contract duration

Permanent

Hiring type

Direct

Global hiring

Location specific

Offer details

Compensation and benefits

Compensation

Compensation not disclosed

VisibilityShared on listing
CurrencyUSD
PeriodYearly

Benefits and perks

Health Insurance

Location, schedule, and role shape

Work setup

Work conditions

Primary locationParis, Paris, France
Work typeHybrid
Global hiringNo

Bandwidth profile

peopleHigh • 8/10
physicalLow • 2/10
cognitiveHigh • 9/10
executionHigh • 8/10
creativityHigh • 8/10
uncertaintyHigh • 8/10
communicationHigh • 9/10

Context on the employer

Company snapshot

Company

Doctolib

Team size

Growing team

Location

Paris, Paris, France

At Doctolib, we’re reinventing the daily lives of health professionals and empowering people to live healthier across Europe. More than 3,000 Doctolibers across France, Germany, Italy, the UK and the Netherlands are building a new generation of AI-powered technologies and services, trusted by 520 000 health professionals and over 90 million patients every day. AI is at the heart of how we build and how we work. At Doctolib, AI fluency is a core skill for every team member: we foster a culture leveraging AI to drive efficiency, quality, and impact at scale.

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Principal Machine Learning Engineer - Applied AI & LLMs

Paris, Paris, France • Full Time