Senior Java/Kafka developer

Salary: PLN/day on B2B

Work model: elastic hybrid from Gdynia / Gdańsk (at least 2 days per week from the office)

Why choose this offer?

• You can expect a flexible work organization
• The international work environment will give you the opportunity to interact with the English language on a daily basis
• Scandinavian organizational culture will provide you with work-life balance, you will gain time for additional training (financed by Jit)
• The Jit community will bring you a nice time during regular integration meetings

Project

You will be involved in a financial project focused on building scalable, event-driven data services and integrating high-volume streaming pipelines with Snowflake to support real-time processing, analytics, and business-critical decision workflows.

Responsibilities you'll have

• Design, develop, and maintain data-intensive, event-driven services using Java and Kafka
• Build and enhance microservices architectures, ensuring scalability, resilience, and observability
• Implement real-time data pipelines and integrations with Snowflake and other cloud-based systems
• Follow best engineering practices including SOLID, clean code, and automated testing
• Collaborate with cross-functional teams to refine requirements and deliver high-impact features on time
• Ensure proper data security, including OAuth/JWT authentication and secure service-to-service communication
• Apply domain-driven design principles (DDD, ports & adapters / hexagonal / clean architecture)
• Participate in code reviews, technical discussions, and continuous improvement initiatives
• Troubleshoot production issues and contribute to performance tuning
• Work in an Agile environment with strong ownership and focus on delivery quality

Expected competences and knowledge

• Strong, senior-level experience in Java, ideally 10+ years.
• Solid expertise in Kafka, preferably 5+ years.
• Senior-level proficiency with Kubernetes.
• Advanced knowledge of SQL and experience with large datasets.
• Practical experience with Spring Boot and Hibernate/JPA.
• Understanding of reactive programming concepts.
• Hands-on experience building microservices architectures.
• Good command of SOLID principles and common design patterns.
• Familiarity with DDD, hexagonal, or clean architecture.
• Knowledge of OAuth, JWT, and related security mechanisms.
• Fluency in English for everyday communication.
• Nice to have: 2–3 years of hands-on work with Snowflake
• Nice to have: experience with Angular 

Technologies you'll work with

• Java
• Kafka
• Kubernetes
• Snowflake
• SQL 
• Spring Boot

Client – why choose this particular client from the Jit portfolio?

Jit Team has had an over-decade-long relationship with the leading financial group in the Nordic countries, and we are privileged to be our client's premier partner in Poland. At present, over 200 Jit personnel are engaged in the completion of more than 60 projects for this Norwegian major provider of financial services with a global presence and a strong focus on modern technology. Our customer's work atmosphere is epitomized by the Scandinavian culture, which is conducive to people who place emphasis on work-life balance and feedback culture. Furthermore, all projects are executed in international teams, giving constant exposure to the English language. 

About Jit Team

The Human factor of IT - it's not just a slogan, it's a philosophy. The foundation of Jit Team is people, which is why we prioritise you. We employ over 700 experienced experts. We create highly specialised teams for clients from all over the world. We offer team members developmental projects, a wide range of benefits and a proprietary professional development programme.

Behind our maxim are also charitable and educational activities. We support pupils and students by donating learning equipment. We offer internships to help launch careers in IT. We support water rescuers and hospitals by providing the necessary equipment. We are a Polish company and we share what we have achieved over 15 years of activity. By supporting indigenous initiatives, we ensure the circulation of good energy.