Software Engineer

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