# Java Software Engineer - FinTech at Flix

- Company: Flix
- Status: Open
- Workplace: On-site
- Location: Warsaw
- Level: Mid-level
- Discipline: Backend
- Employment: Contract
- Posted: 2026-10-28
- Skills: Java
- Apply: https://flix.careers/job/8921675002?gh_jid=8921675002

## 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 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 commerci

More Flix roles: https://deviantjobs.com/companies/flix