Java Software Engineer - FinTech
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Salary
≈ $45k – $79k per year (Estimated)
Location
In office (Warsaw)
Seniority
Middle · 3+ years exp
Employment
Contractor
Confirmed on the employer's own hiring board on Nov 2, 2026. First seen by Alion on Oct 28, 2026. Flix scores B on the Alion truth index.
Overview
Company
Impact
Profile match
Flix is a Munich-based travel technology and mobility company that runs the FlixBus intercity coach network and FlixTrain rail services, selling tickets online and through its app. Founded in 2011, it works with regional bus partners who operate its green-branded coaches across Europe and the Americas, and it owns Greyhound in the United States, with tech and service hubs in Berlin, Gurgaon and other cities. It hires software, data and HR technology analysts, people partners and HR operations specialists, customer support staff, project managers and network and operations roles.
Rate: 89 - 119 / hour (B2B)
We are looking for a skilled Java Engineer to join Flix on a freelance/service agreement basis (B2B contract). This is a contractor engagementto work on impactful, hands-on challenges in thedomain of financial technology.
Scope of Services
Bring expertisein Java-based backend development. Work across Flix's finance technology environment to build and maintaincritical internal applications - from revenue accounting, invoices processing to bus partner settlements and payment reconciliation.
About the Engagement
- Design, build, and maintain features for the internal data-heavy applications, supporting automated bus partner settlement generation across all FlixBus entities around the globe.
- Develop and enhance the internal services that allow finance and billing teams to manage bus partners' settlement-relevant data and track changes via event history.
- Communicate directly with business counterparts (finance, billing, and partner teams) to understand needs and shape solutions.
- Actively participate in product development, from refinement and technical design through delivery and operations.
- Implement and maintain event-driven data processing workflows using Kafka to support settlement operations.
- Contribute to infrastructure-as-code practices and CI/CD pipelines on AWS, and run services on Docker/Kubernetes, with monitoring and observability (e.g. Datadog).
About You
- At least 3 years of experience as a Software Engineer, with exposure to data processing systems
- Proven experience working with Java in a commercial environment
- Experience with event-driven architectures, ideally Kafka
- Experience working with cloud-based infrastructure providers, ideally AWS
- Solid SQL knowledge
- Hands-on experience with Docker and Kubernetes (or similar container orchestration tools) and CI/CD
- Familiarity with Snowflake or similar data warehousing solutions is a plus
- Experience in front-end technologies (e.g., JavaScript, HTML5, React.js, or Angular) is a plus
- Fluent in English
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
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