Senior Kotlin Engineer (m/f/d) - B2B Sales & Distribution team

At Flix, we offer a tech-driven environment where innovation meets real-world impact, with competitive pay, strong growth opportunities, and a culture of collaboration and ownership.B2B Sales & Distribution team in Demand Divisionbuilds and operates the backend platform powering Flix's partner-facing ecosystem — including a self-management platform for partners, a back office portal for internal users, and an AI agentic bot supporting partner operations. As a Senior Kotlin Backend Engineer (m/f/d), you can make an impact by supporting a significant modernization of backend architecture and working in an AI-native development environment.About the RoleDesign and develop backend services in Kotlin and Spring BootBuild and maintain REST APIs used by internal and external partnersParticipate in architectural decisions and technical modernization initiativesImprove observability, performance, and reliability of backend systems using DataDogContribute to CI/CD pipelines and cloud infrastructure on AWS and KubernetesWork in and contribute to an AI-native development environment — including AI-integrated code review automation and an internal Claude Code plugin marketplace covering engineering standards: Kotlin/Spring Boot conventions, architectural patterns, testing practices, database guidelines, and team-specific conventions.About You5+ years of professional backend development experience with JVM languages with at least 2 years of commercial experience with KotlinHands-on experience with Spring Boot Experience building and maintaining REST APIs and distributed systemsSolid SQL knowledge and relational database design, including MySQL and PostgreSQLSound software engineering fundamentals, clean code practices, and familiarity with ORM and persistence layersCollaborative and pragmatic, comfortable working in cross-functional Agile teamsPreferred: AWS, Kubernetes, GitLab CI/CD, Kafka, Terraform, LLM integrations, RAG systems, AI product development, or legacy system migration experienceWe recognize that everyone carries a unique set of valuable skills and experiences. If you think you could have an impact even though you don't meet 100% of the requirements, we still encourage you to apply. We want to hear from you!What We OfferTravel perks: 12 free Flix vouchers + 12 discount vouchers for friends & family. Work from (M)Anywhere: Depending on your role, work from another location for up to 60 days per year. Hybrid work model: We are an office-first company, but we offer flexibility to balance work and life. Wellbeing support: Access confidential 1:1 counselling, courses, and stress management for yourself and up to four family members. Learning & Development: Take advantage of language classes, training courses, and expert-led sessions to grow your skills. Mentoring Program: Connect with experienced colleagues to gain insights and accelerate your career. To view more local benefits specific to each office location, please check out this link: Locations - Flix CareerWhy Join Flix?At Flix, we empower our teams to push boundaries and shape the future of mobility. As we continue to scale globally, we harness cutting-edge technology to make mobility smarter, more sustainable, and more affordable.If you’re looking for a place where you can drive change and redefine how millions of people travel, Flix is the place where you can lead your journey!