Software Engineer (Kotlin, Java) (m/f/d) - Capacity Management team

Software Engineer (Kotlin, Java) (m/f/d) - Capacity Management team

City: Berlin

Department: IT & Engineering

Recruiter: Anna Symonenko

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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.

Were 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

3–5 years of experience building production-grade backend systems, with Java or preferably using 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 – youll 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 dont 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.