Java Software Engineer - FinTech

Flix·Warsaw·Posted 28 October 2026

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About the role

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…

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