We're looking for a motivated and driven Senior Kotlin Engineer who will help us shape our Payments team, drive the company to the next level, and have the most direct influence on our success.

You will be part of the customer-facing Payments Product Engineering team, focusing on providing an easy and intuitive checkout experience. Most of our services are written in PHP with a React.js front-end. We are transitioning to Kotlin for new services and need your expertise.

Our payments team consists of three back-end engineers, two front-end engineers, an Engineering People Manager, and a Product Owner. We aim to achieve high progression and payment authorization rates, improve payment efficiency and revenue protection, and ensure data reliability. We are integrating more local payment methods in various markets and solving numerous engineering challenges.

Join us in Team Payments to deliver a top-of-the-line, seamless, and secure payment experience for green and smart mobility worldwide.

Your Tasks – Paint the world green

• Design technical solutions that serve millions of users.
• Decouple our large systems into independent services and self-contained systems.
• Optimize databases with hundreds of millions of rows.
• Write SOLID, maintainable, flexible, testable, and tested code.
• Analyze, propose, and drive technology improvements.
• Support our CI/CD environment and produce a positive impact with each release.
• Be part of an autonomous cross-functional team, responsible for the payments product from concept to implementation.
• Work closely with team members through pair and mob programming, code reviews, and testing.

Your Profile – Ready to hop on board

• Proficiency in Kotlin, including modern features and best practices.
• Familiarity with JVM-based technologies, including libraries and tools.
• Experience with PHP and Symfony (or be a fast learner and be open to working with it).
• Knowledge of designing and implementing microservices, including service discovery, load balancing, and inter-service communication.
• Strong analytical and problem-solving abilities to debug and optimize complex systems.
• Knowledge of security best practices for backend development, including OAuth, JWT, and SSL/TLS.
• Experience with containerization (Docker) and orchestration (Kubernetes).
• Experience with cloud services (AWS is a plus).
• Good SQL experience and a good understanding of an ORM's internals.
• Experience with in-memory data stores like Redis for caching and session management.
• Good knowledge with CI/CD pipelines and tools.
• Experience with distributed messaging systems (Kafka).
• Proficiency in writing tests (e.g., unit, integration, and end-to-end tests).
• Understanding of DevOps principles and experience with infrastructure as code (e.g., Terraform, Ansible).
• Expertise in designing and developing RESTful APIs.
• Familiarity with Agile practices, such as Scrum or Kanban.
• Bachelor/Master in Computer Science, Information Systems, or relevant industry experience.
• Fluent in English.
• It’s a plus if you bring, experience with Payment Systems.
• You are a team player, love to take ownership, lead initiatives and work in a collaborative environment.
• You have good written and verbal communication skills to effectively convey technical ideas and work with cross-functional teams.
• You are passionate about mentoring and helping your peers grow.

Our Perks – More than just a job

• You have an impact. With innovation and smart technology, we are creating the easiest way to travel. We want your ideas and give you autonomy to make them reality.​
• Flix is flexible. Organize your own schedule with trust-based hours and up to 60 days of working from (m)anywhere. We are an office-first company, and we encourage all employees to come regularly to their local office.
• Travelling is our passion. Discover the world with your free Flix rides and bring along your friends and family for half price.
• Teamwork makes the dream work. Our FlixTeam has people from over 100 different nations. We work in a multicultural environment where we can challenge and support each other.
• We're not only green in color. We’re building for the long term, and that means protecting our planet. We constantly test new green technologies and compensate for the CO2 after all our business travel since 2018.
• Your well-being is important to us. To treat your mind and body we will give you a competitive paid time off package, mental health support including 1:1 consultations with a psychologist, and a neat discount on UrbanSportsClub memberships.
• Want to rewrite the history of mobility with us? Then join our ride and apply now. We're excited to hear from you! 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.

Flix – A place to enjoy work and have an impact

• The future of transportation is Green. Here at Flix Tech, the R&D group, we develop software with the brightest minds from around the world to engineer new experiences for our millions of customers across our apps and websites. Every day we solve challenging problems, like how to scale rapidly around the world and how to make an experience that delights our customers. We have a culture of sharing ideas, contributing to open source projects and being an active member in our technical communities.
• Flix is proud to be an Equal Opportunity Employer. We celebrate diversity and do not discriminate on the basis of race, color, religion, gender (including pregnancy and gender identity), national, social or ethnic origin, political affiliation, sexual orientation, marital status, disability, age, veteran status, or other legally protected characteristics. All employment decisions are based on business needs, job requirements, competence and merit.