Flix

Java Software Engineer - FinTech

Warsaw · Berlin, Berlin, Germany · München, Bayern, Germany

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hirly's read of this role

Role family: Engineering
Seniority: Mid level
Countries: PL, DE
Work mode: On-site / unstated
First seen by hirly: 29 Oct 2026

Derived automatically from the posting. Upload your resume above to see how the role scores against it.

the posting

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 engagement to work on impactful, hands-on challenges in the domain o f f inanc ial t echnology .

Scope of Services

Bring expertise in Java-based backend development. Work across Flix's finance technology environment to build and maintain critical 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

Original posting on Flix's site ↗

Listed on hirly, a job board. hirly is not the employer: Flix is hiring for this role.

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