20 beste Stellen als engineer kotlin in berlin, be – aktuell auf Personalsuche

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.

You’ll 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, we’re 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 don’t 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 - we’ll 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 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,

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!

Jetzt bewerben

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