Senior Backend Java Developer

Salary: 1000–1300 PLN/day on B2B

Work model: Hybrid from Gdynia, Gdańsk, or Warsaw (3 days per week from the office)

Why choose this offer?

• Flexible work organization
• International work environment with daily use of English
• Scandinavian organizational culture and work-life balance
• Time for additional training financed by Jit
• Regular integration meetings

Project

We are looking for a Senior Backend Java Developer to join a team responsible for developing and maintaining applications that support tax processing, account management, and investment operations for pension and savings products. The role focuses on modernizing existing platforms and delivering scalable backend solutions using the latest Java ecosystem technologies.

Responsibilities

• Lead application modernization activities, including upgrades to Java 17+/Java 21 and Spring Boot 3.3.x
• Design, develop, and maintain Java-based applications supporting savings and investment products
• Build and enhance calculation engines that ensure compliance with tax regulations across multiple countries
• Implement solutions supporting complex business processes, integrations with tax authorities, and customer reporting
• Participate throughout the entire software development lifecycle, from requirements analysis and design to development, testing, and deployment
• Collaborate with business stakeholders and financial analysts to translate business requirements into technical solutions
• Contribute to system architecture discussions and technical improvements

Expected competences and knowledge

• Several years of experience as a Senior Java Developer
• Strong expertise in Java development
• Excellent knowledge of Spring Boot
• Hands-on experience with application modernization and migration projects
• Practical experience working with Java 21
• Strong understanding of relational databases and SQL, particularly PostgreSQL
• Experience with messaging technologies such as JMS and MQ
• Knowledge of OpenAPI and AsyncAPI specifications
• Experience with Git and modern CI/CD practices
• Solid understanding of software design patterns and object-oriented programming principles
• Strong communication skills and ability to work in a collaborative environment

Technologies

• Java 21
• Spring Boot 3.3.x
• Hibernate
• PostgreSQL
• JMS
• MQ
• OpenAPI
• AsyncAPI
• Git
• CI/CD