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