Rate: 135 – 170 PLN/hour (B2B)
We are looking for an experienced Software Engineer to join Flix on a freelance/service agreement basis (B2B contract). The team owns a critical product at the heart of the Flix ecosystem - optimizing how Flix coordinates with Mobility Partners to keep millions of passengers moving across the globe.
Scope of Services
You'll have a real impact, contributing not just to code, but to product and technical decisions that directly impact the business. With your services you’ll maintain and continuously evolve a mature, stable product while simultaneously pushing it forward - tackling complex architectural challenges, reducing manual processes, and exploring AI-driven solutions.
About the Engagement
- You’ll collaborate with a distributed, self-organized, cross-functional team
- You’ll have the opportunity to co-design new products from the ground up while continuously improving existing ones, with room to explore and implement cutting-edge technologies
- Drive the development process in an Agile environment, placing Flix users at the center of each solution you and the team create
- Support technical decisions across teams, improving technical excellence through collaboration and lateral leadership
- Help define and deliver products that optimize the coordination between Flix and Mobility Partners, enhancing efficiency and reducing manual tasks
About You
- 6+ years of experience as a Software Java and/or Kotlin Engineer, with knowledge of distributed systems, including Spring/Spring Boot, Kafka, MySQL/Postgres, Redis, MongoDB and S3
- Willingness to work with both Java (for existing products) and Kotlin (for new ones)
- Experience in making architectural decisions, and writing clean, performant, well-tested code
- Autonomy and ownership in solving technical challenges, as well as strong communication skills when working with a distributed team
- A strong product mindset, with a passion for user experience and a data-driven approach to decision-making
- Experience in coding with AI
- Fluent in English (upper-intermediate or higher)
Nice-to-Haves
- Experience with DevOps and infrastructure: Kubernetes, Docker, Gitlab CI, AWS, Terraform
- Familiarity with data engineering (ETL, Snowflake)
- Ability to be a sparring partner, share knowledge and experience, explain complex things in plain language, consult/mentor, and provide constructive feedback
Cooperation Model
- Cooperation based on a service agreement (B2B/freelance contract), not an employment contract
- You will operate as an independent contractor, responsible for delivering agreed services and submitting invoices
- Location: open for contractors based in Poland
Skills Required
- 6+ years of experience as a Java and/or Kotlin software engineer
- Knowledge of distributed systems
- Experience with Spring or Spring Boot
- Experience with Kafka
- Experience with MySQL or PostgreSQL
- Experience with Redis, MongoDB, and S3
- Willingness to work with both Java and Kotlin
- Experience making architectural decisions
- Ability to write clean, performant, well-tested code
- Autonomy and ownership in solving technical challenges
- Strong communication skills in a distributed team
- Product mindset with passion for user experience and data-driven decision-making
- Experience coding with AI
- Fluent English at upper-intermediate level or higher
- Experience with DevOps and infrastructure technologies including Kubernetes, Docker, GitLab CI, AWS, or Terraform
- Familiarity with data engineering and ETL
- Experience with Snowflake
- Ability to mentor, explain complex concepts, and provide constructive feedback
- Must be based in Poland
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
