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.

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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.