Senior Backend Engineer (Java/Kotlin)- (m/f/x)

Set a new pulse for healthcare! We are looking for a Senior Back End Software Engineer to join the Business Performance team at Doctolib. Your mission will be to help reinforce Doctolib's 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 a feature team 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. What you'll do Your responsibilities include but are not limited to: • Collaborate with product managers, designers, and engineers to design and ship features that deliver real value to healthcare professionals and patients • Design and implement robust technical solutions ensuring performance, security, and usability across our back-end applications • Contribute to technical decisions and architectural choices — not just implementation — helping shape the long-term direction of the platform • Navigate integration complexity across a broad and diverse partner ecosystem, balancing delivery speed, reliability, and maintainability • Champion AI-assisted development workflows and help elevate your team's proficiency with these tools • Share your expertise across teams to evolve Doctolib's architecture and technical standards through knowledge sharing, code reviews, and pair programming 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 strong back-end software engineering experience with the JVM ecosystem (Java, Kotlin, Spring Boot) • Have hands-on experience using AI-assisted coding tools and are comfortable integrating them into your daily workflow • Have significant experience navigating integration complexity across large partner networks and diverse legacy systems • Have a "user first" mindset and are committed to building secure, well-tested, and pragmatic code — you bring a strong testing culture and care deeply about code quality and system resiliency • Are proactive, curious, and eager to grow alongside your teammates through pair programming and cross-team collaboration • Are fluent in English It would be fantastic if you: • Have experience with Ruby on Rails • Have contributed to large-scale platform architecture discussions or technical roadmap planning 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 • A Deutschlandticket (Germany-wide public transport pass) fully paid for by Doctolib • 28 vacation days + 1 additional day for each full calendar year of employment (up to a maximum of 30 days) • Work from abroad for up to 10 days per year thanks to our flexibility days policy • Company health insurance with great supplementary benefits through our partner Allianz • Company pension scheme (bAV) through Allianz with an employer subsidy of 40% (15% within the probationary period) • The Doctolib Parent Care program, which includes one month additional parental leave and much more • Enrollment in Doctolib's long-term employee value sharing plan called DoctoGrowth • Free m