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, please check out this link: Locations - Flix Career
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!
Skills Required
- 3-4 years of experience building backend or full-stack web applications
- At least 2 years working with Kotlin in a commercial setup
- Experience with frontend development using JavaScript/Typescript and modern frameworks
- Strong object-oriented programming skills
- Hands-on experience with automated testing
- Hands-on experience deploying applications using CI/CD pipelines
- Clear written and spoken English communication
What We Do
Flix is a global travel tech leader providing sustainable and affordable travel options to more than 60 million yearly travelers in 43 countries through its brands FlixBus, FlixTrain, Greyhound, and Kamil Koç. By combining network planning, marketing, and pricing, Flix uses innovative solutions to enable comfortable, sustainable, and affordable travel worldwide. Through our tech platform and user-friendly app, Flix creates a travel experience tailored to passengers' needs and connects travelers with local business partners providing transportation, ensuring a modern fleet that adheres to the highest safety standards. This asset-light business model has turned a European start-up into a leading and globally expanding travel-tech champion. Flix is pioneering and testing alternative drives with a long-term strategy to progressively decarbonize its fleet. Together with our partners and customers, we are driving transformative change towards the future of mobility, gradually reshaping the mobility sector and enabling more sustainable travel modes. Check out https://flix.careers/ to see how you can join our team. For our legal imprint click here: https://global.flixbus.com/legal-notice
