Senior Backend Java Developer NEW

Jit Team; Poland; Hybrid; PLN 240,000 - 300,000; Full time

Benefits offered by this job

Flexible work organization

International work environment

Scandinavian culture and work-life-b_

Job summary

Jit Team is seeking a Senior Backend Java Developer in Poland to modernize and maintain platforms for tax processing, account management, and investment operations. You will work in a hybrid setup with colleagues across international teams, focusing on scalable Java backend solutions and the latest Java ecosystem tools.

You will upgrade to Java 17+/21, apply Spring Boot 3.3.x, and collaborate with financial analysts to translate requirements into robust software.

Qualifications

• Several years of experience as a Senior Java Developer.
• Excellent knowledge of Spring Boot and Java ecosystems.
• Hands-on experience with application modernization and migration projects.
• Strong SQL skills with PostgreSQL.
• Experience with messaging (JMS, MQ) and modern CI/CD practices.

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 ensuring tax regulation compliance across multiple countries.
• Implement solutions for complex business processes, tax authority integrations, and customer reporting.
• Contribute to system architecture discussions and collaborate with stakeholders.

Skills

Java

Spring Boot

Relational DBs & SQL

OpenAPI/AsyncAPI

Git & CI/CD

Communication

Team Collaboration

Tools

Hibernate

JMS

MQ

OpenAPI

AsyncAPI

Job description

Work model:

hybrid from Gdynia / Gdańsk / Warszawa (3 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 duringregular 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 you'll have

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

Excellent knowledge ofSpring Boot

Hands-on experience with application modernization and migration projects

Practical experience working withJava 21

Strong understanding of relational databases and SQL, particularlyPostgreSQL

Experience with messaging technologies such asJMS and MQ

Knowledge ofOpenAPI and AsyncAPI specifications

Experience withGit 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 you'll work with

Spring Boot 3.3.x

Hibernate

JMS

MQ

OpenAPI

AsyncAPI

Git

CI/CD

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 770 experienced experts , to whom we offer developmental projects, a wide range of benefits, and a proprietary professional development programme. Together with clients from around the world, we create innovative IT solutions delivered by highly specialised and efficient teams.

Behind our maxim are also charitable and educational activities. We support schools, universities, and educational institutions by conducting workshops, running educational projects, sponsoring events, and donating learning equipment. We offer internships that help launch careers in IT. We support water rescuers and hospitals by providing the necessary equipment. We also support numerous charitable organisations helping people in need, children, and the elderly. We are a Polish company and we share what we have achieved over more than 15 years of activity. By supporting local initiatives, we contribute to the circulation of good energy.