Software Engineer (Kotlin, Java) (m/f/d) - Capacity Management 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.   We're looking for a Software Engineer (Kotlin, Java) with strong Kotlin (or Java and willing to learn Kotlin) skills to join our Capacity Management team in the Demand Division. The Capacity Management team builds and runs the systems that determine how seats are allocated, priced, and managed across Flix. We handle high-throughput, real-time data pipelines and event-driven microservices that keep operations running smoothly, even under unexpected conditions.  As a Software Engineer at Flix, you can make an impact by working on systems that directly impact how millions of passengers book seats and how Flix optimizes capacity across its global network, at scale, in real time.  Our tech stack  Languages & Frameworks: Kotlin, Spring Boot, Akka/Pekko  Data & Messaging: PostgreSQL, Kafka, Event Sourcing, CQRS  Infrastructure: AWS, Kubernetes (K8s), Docker  Architecture: Microservices, RESTful APIs  About the Role Work in a cross-functional and self-organized team, which develops software related to our e-commerce business Develop microservices meant to assist in managing the capacity of various capacitive-sensitive products  Analyze, propose, and drive technology improvements Uphold engineering quality through code reviews, testing, and thoughtful design decisions  Use AI tools such as Claude Code and Copilot conscientiously to assist in faster and higher-quality development Take ownership of features end-to-end, from design and implementation through to production, while also contributing to the continuous improvement of our existing systems About You Solid experience building production-grade backend systems with Java, or preferably Kotlin  Comfortable making technical decisions independently  Good understanding of OOP and Software Design Patterns  Experience designing and working with relational databases such as PostgreSQL  Good knowledge of testing principles  Familiar with CI/CD and deploying to production  Strong written and verbal communication skills in English are a must  You value open communication, constructive feedback, and shared ownership of outcomes  Nice to have – you'll stand out if you also have:  Experience with Akka/Pekko  Experience running containerized applications (Docker, Kubernetes)  Understanding of Kafka-like message brokers and streaming patterns  Hands-on experience with event-driven architecture principles (event sourcing, CQRS) applied within a microservices ecosystem   Familiar with cloud providers (especially AWS)  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: https://flix.careers/locations/ 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!    Offices: Berlin, Berlin, Germany (Berlin);