Java Software Engineer - FinTech

FlixBus; Warszawa; In loco; PLN 83.000 - 124.000; Tempo pieno

Descrizione del lavoro

Flix is seeking a Java Engineer on a freelance/service agreement basis to join our finance technology domain. You will build backend features for internal data-heavy applications and support settlement-related workflows across FlixBus entities worldwide.

Ideal candidates have 3+ years of Java experience in a commercial setting, are comfortable with Kafka, AWS, Docker, Kubernetes, and SQL, and can collaborate directly with finance and billing teams to deliver robust solutions.

Competenze

• 3+ years of experience as a Software Engineer with data processing experience.
• Proven experience with Java in a commercial environment.
• Experience with event-driven architectures, ideally Kafka.
• Experience with cloud providers, ideally AWS.
• Strong SQL knowledge.
• Hands-on with Docker and Kubernetes and CI/CD.
• Familiarity with Snowflake is a plus.

Mansioni

• Design, build, and maintain internal data-heavy applications for settlement generation.
• Develop and enhance internal services for finance and billing teams.
• Communicate with finance, billing, and partner teams to shape solutions.
• Contribute to product development from refinement to delivery and operations.
• Implement event-driven data processing workflows using Kafka.
• Contribute to infra-as-code, CI/CD on AWS with Docker/Kubernetes and Datadog monitoring.

Conoscenze

Java

Data processing

Kafka

SQL

Docker

Kubernetes

CI/CD

AWS

Event-driven

Strumenti

Datadog

Snowflake

Descrizione del lavoro

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

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