Senior Java Developer (fintech project)

Xebia is a digital solutions provider focused on cloud-based technology, partnering with major cloud providers such as AWS, Azure, and GCP. We seek experienced Java backend developers to contribute to our trading and fintech platforms in Poland.

Responsibilities

• Designing, developing, and maintaining high-performance backend systems using Java and Spring Boot.
• Working on transaction, payment, and cashier-related functionalities within a complex trading platform.
• Building and maintaining RESTful and RPC APIs (e.g., using Apache Dubbo).
• Developing solutions capable of handling high‑volume traffic, high concurrency, and multi‑threaded environments.
• Processing and optimizing large volumes of data within distributed systems.
• Collaborating with cross‑functional teams to deliver scalable and reliable systems.
• Integrating backend services with third‑party applications and external systems.
• Troubleshooting, debugging, and optimizing system performance in production environments.

Qualifications

• 5+ years of professional experience in Java backend development.
• Strong experience with Java (8+) and Spring Boot.
• Experience in business product development within fintech environments.
• Experience working on B2B products.
• Hands‑on experience with high‑concurrency systems, multi‑threading, and high‑volume traffic environments.
• Proven experience working with large‑scale data processing systems.
• Solid knowledge of technologies such as MyBatis, Redis, and message queue systems.
• Experience working with relational databases such as MySQL, including writing complex queries and performance tuning.
• Experience working with Elasticsearch and big data technologies such as Hadoop.
• Experience with messaging systems (queues) and event‑driven architectures.
• Experience with unit and integration testing.
• Experience integrating with third‑party services and APIs.
• Practical experience using AI‑powered assistants (e.g., Claude Code, GitHub Copilot, Cursor) to improve productivity, quality, or decision‑making in software delivery.
• Strong debugging and problem‑solving skills.
• Solid understanding of software design patterns and backend architectures.
• Good communication skills and ability to work in a team environment.
• Immediate availability or a short notice period is preferred.

Nice to have

• Familiarity with RPC frameworks such as Apache Dubbo.
• Experience working with systems serving large‑scale user bases.
• Understanding of distributed systems and microservices architecture.
• Experience applying GenAI in a more structured way within the SDLC, including defined workflows, prompt patterns, or tool integrations embedded into daily work.
• Interest in and familiarity with emerging AI‑driven practices (e.g., agent‑based workflows, automation patterns, AI‑augmented development), with a willingness to explore and experiment beyond standard approaches.

Work location and legal requirements

Work from the European Union region and a valid work permit are required. Applicants must have permission to work in the EU.

We are an equal‑opportunity employer. All qualified applicants will receive consideration for employment without regard to race, color, religion, sex, sexual orientation, gender identity, national origin, disability, or veteran status.

EEO statement: Xebia complies with the legal requirements for data protection and is committed to respecting privacy and securing personal data in accordance with applicable laws.