Full-stack (Java/Kotlin) Engineer (m/f/d) - Team Payments

Full-stack (Java/Kotlin) Engineer (m/f/d) - Team Payments

City: Munich

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.

As a Full-stack Engineer with a strong backend focus (Kotlin) you will help us build the future of payments for green and smart mobility.

Youll join our Payments Team - the heart of our checkout experience - as part of our Demand Division. Your work will directly impact how millions of people pay, how quickly their transactions are processed, and how much revenue we generate. We continuously work to improve payment authorization and conversion rates, increase payment efficiency and revenue protection, and ensure data reliability. At the same time, were integrating local payment methods across different markets and tackling complex engineering challenges along the way.

We build our core services using Kotlin and Spring Boot, and our interfaces with TypeScript and React.js. We also maintain some legacy PHP systems — you dont need to love it, but you should be open to working with it when needed.

Our Payments Team consists of four backend engineers, two frontend engineers and an Engineering Manager.

About the Role

Build the systems that move money fast, safely, and at scale

Design and ship features used by millions of users

Write clean, tested, production-ready code

Own features from idea to release

Work closely with business, UX, frontend, and backend engineers

Review code, pair program, and ship often

Improve existing systems and clean up legacy code

About You

3-4 years of experience building backend or full-stack web applications, including at least 2 years working with Kotlin in a commercial setup

Some experience with frontend development with JavaScript/Typescript and any modern framework (React.js, Vue.js, Angular)

Open to working with PHP in legacy systems when needed - prior experience is not required, the team will support your learning

Strong object-oriented programming skills with a focus on clean architecture and maintainable design

Solid experience working with relational databases

Hands-on experience with automated testing (unit, integration, component or UI)

Hands-on experience deploying applications to production environments using CI/CD pipelines

Clear written and spoken English communication skills

A collaborative, team-first mindset

Nice to have - well support you in developing these skills if needed:

Containerization and orchestration tools such as Docker and k8s

Familiarity with event-driven architectures and messaging systems (e.g., Kafka)

Exposure to AWS or other cloud platforms

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.