Senior Java Software Engineer (H/F) - Nantes

Doctolib

YOUR IMPACT We are looking for a Senior AI Engineer to join the Customer Care Contact team in the Business Performance domain. Your mission will be to build AI-powered tools that revolutionize how healthcare professionals deliver care. You will work on Doctolib Assistant, our AI personal assistant designed to assist doctors and medical staff in their daily work—from answering complex medical questions to automating administrative tasks with accuracy, reliability, and safety. 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 BUILD Your responsibilities include but are not limited to:   * Design, ship, and operate production-grade agentic systems powering Doctolib Assistant, our AI personal assistant that addresses key challenges for healthcare professionals * Build and improve AI agents and our orchestration systems * Partner with data scientists to design and implement evaluation pipelines, security/safety guardrails, and metrics—while taking ownership of operational AI projects as data science teams focus on exploratory research * Develop and maintain core agentic capabilities including memory, reasoning orchestration, tool adapters, and multi-agent coordination, ensuring strong observability, fallback mechanisms, and fail-safe behaviors * Own performance, observability and security: monitoring dashboards, SLO/SLI, and security posture * Ensure privacy and security by design, with a particular focus on medical data sensitivity * Contribute to fullstack development when needed to deliver end-to-end features for healthcare professionals WHAT YOU'LL BRING 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 4+ years of experience as a software engineer, with hands-on experience in AI/ML systems * Have 2+ years of experience working with Python * Have gone through the full lifecycle of an AI product, from initial evaluation and launch to iterations based on results in production * Understand and promote best practices related to the software development life cycle such as automated testing, good use of CI/CD, and DevOps practices * Are comfortable with fullstack development and not afraid to dive into React/TypeScript/Kotlin to ship end-to-end features * Are product-oriented and comfortable guiding your teammates to suggest tradeoffs to balance business needs with technical constraints * Are comfortable speaking and writing in English in your day-to-day work with the team It would be fantastic if you: * Have experience building multi-agent systems or agent development frameworks * Have worked on AI products for enterprise/professional users * Have experience in the medical domain or healthcare tech 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 the Doctolib Tech site. WHAT WE OFFER * Free comprehensive health insurance for you and your children * ParentCare Program: Enjoy full salary coverage (100%) during your first month of birth leave, and 75% during the second, covered by Doctolib * Free mental health and coaching services through our partner Moka.care * For caregivers and workers with disabilities, a package including an adaptation of the remote policy, extra days off for medical reasons, and psychological support * Work from abroad for up to 10 days per year, thanks to our flexibility days policy * Up to 14 days of RTT * A subsidy from the work council to refund part of the membership to a sport club or a creative class * Lunch vouchers (Swile card) worth €8.50 per working day, with €4.50 covered by Doctolib * 50% reimbursement of your public transport subscription * Enrollment in Doctolib's long-term employee value sharing plan called DoctoGrowth * Relocation support in case of international mobility * Access to the best AI tools for coding, development and dedicated training OUR INTERVIEW PROCESS * Recruiter Interview * Coding Interview * System Design Interview (with focus on AI systems architecture) * Behavioral Interview * At least one reference check We want your experience to be clear, respectful, and transparent. Learn more about our hiring process on our candidate experience page. JOB DETAILS * Permanent position * Full-time * Location: Nantes, France * Start date: as soon as possible WE WELCOME EVERYONE 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, click here: France. Please contact hr.dataprivacy(at)doctolib.com for inquiries or to exercise your rights.

Doctolib

JOIN OUR MISSION, JOIN DOCTOLIB!  Doctolib is growing, and we are hiring a Senior Fullstack Software Engineer in Nantes to join the Business Performance team. Your mission will be to help Doctolib reinforce its position as a leading healthcare technology platform by building high-quality products that improve the daily lives of healthcare professionals and patients. You will work in feature teams developing solutions that directly impact millions of people 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. YOUR IMPACT Your responsibilities include but are not limited to: * Collaborate with product managers, designers, and engineers to build features that deliver value to healthcare professionals and patients * Design and implement technical solutions ensuring performance, security, and usability across our fullstack applications (React, Ruby on Rails, JVM ecosystem) * Strong design and architecture skills: you contribute to technical decisions, not just implementation * A track record of balancing delivery speed, reliability, and maintainability under real constraints * Comfortable with AI-assisted development workflows, and able to help your team raise their own proficiency * Share your expertise and collaborate across teams to evolve Doctolib's architecture and technical standards * In BP, the scope is broad, and the topics are diverse. Teams are small, and decision-making is close to the action. And if you want to understand how a tech scale-up generates (and protects) its growth, you’ll have a front-row seat. 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 the Doctolib Tech site. 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 could be our next team mate if you: * You have fullstack software engineering experience with React and the JVM ecosystem (Java, Kotlin, Spring Boot) - Ruby experience is a bonus * You have a "user first" mindset and are committed to building secure, well-tested, and pragmatic code * You bring a strong testing culture and are passionate about code quality and system resiliency * You are proactive, curious, and eager to share knowledge through pair programming and collaboration 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 * Enrollment in Doctolib's long-term employee value sharing plan called DoctoGrowth * ParentCare Program: Enjoy full salary coverage (100%) during your first month of birth leave, and 75% during the second, covered by Doctolib * For caregivers and workers with disabilities, a package including an adaptation of the remote policy, extra days off for medical reasons, and psychological support     THE INTERVIEW PROCESS  * A first interview with a member of the Talent Acquisition team * A Coding and System Design interviews * A final interview  * Reference check    JOB DETAILS * Permanent position / Fixed term contract * Full Time / Part Time * Workplace * Start date: As soon as possible * Compensation : fix 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, 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.

SFEIR

👾 Tu as l’âme d’un vibe coder ? Tu développes avec Claude Code ouvert en permanence, tu prompts plus vite que ton ombre et tu penses que l’IA va complètement transformer le métier de Data Engineer ? Welcome chez SFEIR Nantes. 🧠 Ce qu’on recherche chez toi Tu n’as pas peur de : architecturer des pipelines data robustes avec Python, SQL, dbt et Airflow, jongler entre BigQuery, Snowflake, Databricks, Kafka ou les outils MLOps, penser Data Quality, gouvernance, observabilité, orchestration et optimisation des coûts, transformer des datasets complexes en plateformes réellement exploitables, expérimenter avec l’IA générative pour réinventer les workflows data. Tu veux comprendre ce qu’il se passe sous le capot. Pas juste lancer des jobs. 🛠️ Les projets sur lesquels tu pourrais t’éclater Construire des plateformes Data & AI cloud-native sur Google Cloud, Développer des pipelines temps réel pour piloter des activités critiques, Industrialiser des architectures MLOps et LLMOps, Concevoir des systèmes RAG connectés aux données métiers, Intégrer l’IA générative dans des workflows analytics et data engineering, Participer à des projets mêlant Data, IA, Cloud et software engineering,  🚀 Pourquoi rejoindre SFEIR Nantes ? Parce qu’ici, la tech passe avant le bullshit. Tu rejoins une communauté où les décisions techniques sont prises par des engineers et où le partage de connaissances fait partie du quotidien. Chez SFEIR Nantes : ton Engineering Manager code, les architectes restent proches du terrain, les talks sont animés par les équipes, et les communautés tech vivent toute l’année. Tu évolues dans une vraie “Skill-Based Organization” : ta progression dépend de ce que tu sais construire, transmettre et faire grandir. 🚀 Ce que tu trouveras chez nous Un vrai management technique, Une communauté active autour de la Data, de l’IA et du Cloud, Des meetups, labs, talks et formations internes toute l’année, Un accès à SFEIR Institute et aux certifications Google Cloud / AWS, Des trajectoires d’évolution variées : IC, Staff Engineer, Engineering Manager, Trainer, Speaker… Une forte culture du craft, de l’architecture et du partage. 🤖 Notre botte secrète : RAISE & SFEIR AI Chez SFEIR, maîtriser l’IA n’est plus une option. Tu auras accès à RAISE, notre plateforme GenAI interne multi-LLM, utilisée par nos équipes pour : accélérer les workflows data, construire des assistants IA connectés aux données métiers, expérimenter rapidement autour des LLMs, développer des usages RAG et agents IA, et industrialiser des solutions concrètes. ✨ Qui sommes-nous ? SFEIR est un pure player du digital, du Cloud, de la Data et de l’IA générative. 900 techs en France, Belgique et Luxembourg qui partagent la même ambition : coder, apprendre, transmettre et construire des produits qui comptent. 🌊 Et Nantes dans tout ça ? SFEIR Nantes, c’est : une communauté tech en pleine croissance, des projets Data & AI à fort impact, une présence forte dans l’écosystème nantais, des speakers présents sur les grands événements tech, des locaux à La Cantine Numérique au cœur de l’Île de Nantes, des talks, afterworks, meetups et SFEIR School toute l’année. Ici, on aime autant débattre d’architecture data que comparer les meilleurs prompts pour optimiser un pipeline IA 😄 🎯 En pratique Localisation : Nantes Télétravail : 2 à 3 jours par semaine Stack fréquente : Python, SQL, dbt, Airflow, BigQuery, Databricks, Kafka, GCP, Vertex AI, Docker, Kubernetes, APIs LLM, RAG 🎮 La suite des événements Premier échange avec l’équipe recrutement, Entretien RH personnalisé, PlayOffs techniques en pair programming avec des Sfeirien·ne·s, Rencontre avec l’équipe business, Échange final avec le management local. 🤩 Ready to build the future of Data & AI with us ? Tu veux construire des plateformes data modernes avec une team passionnée, dans une boîte où la technique est réellement au centre ? Viens discuter avec nous 🚀