Java Software Engineer - FinTech

Flix · Warsaw

  • Junior
  • Full-time
  • Posted 2026-10-28
  • Confirmed live on 29 October 2026

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Job description

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 of financial technology.

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

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