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 Division builds 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 Role

• Design and develop backend services in Kotlin and Spring Boot
• Build and maintain REST APIs used by internal and external partners
• Participate in architectural decisions and technical modernization initiatives
• Improve observability, performance, and reliability of backend systems using DataDog
• Contribute to CI/CD pipelines and cloud infrastructure on AWS and Kubernetes
• Work 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 You

• 5+ years of professional backend development experience with JVM languages with at least 2 years of commercial experience with Kotlin
• Hands-on experience with Spring Boot 
• Experience building and maintaining REST APIs and distributed systems
• Solid SQL knowledge and relational database design, including MySQL and PostgreSQL
• Sound software engineering fundamentals, clean code practices, and familiarity with ORM and persistence layers
• Collaborative and pragmatic, comfortable working in cross-functional Agile teams
• Preferred: AWS, Kubernetes, GitLab CI/CD, Kafka, Terraform, LLM integrations, RAG systems, AI product development, or legacy system migration experience

We 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 Offer

• Travel 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 Career

Why 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!