Senior Java Developer Java, Spring Boot, Postgres SQL Warsaw, Gdańsk, Gdynia

Diverse CG Sp. z o.o. Sp.k.; Warszawa; On-site; PLN 133,920 - 167,400; Full time

Benefits offered by this job

Private medical care

Co‑financing for the sports card

Constant support of dedicated consultant

Job summary

Diverse CG Sp. z o.o. Sp.k. is seeking a skilled Java Developer in Warsaw, Poland. The role involves designing, developing, and maintaining Java-based applications focused on taxation and complex business processes.

Candidates should have strong knowledge of Java and Spring Boot, experience in upgrades and migrations, and proficiency with relational databases and SQL. Perks include private medical care and co-financing for a sports card.

Qualifications

• Experience with Java and Spring Boot upgrades, including migration projects.
• Strong knowledge of Java (preferably Java 21) and Spring Boot.
• Experience with relational databases and SQL (e.g. PostgreSQL).

Responsibilities

• Design, develop, and maintain Java-based applications supporting taxation.
• Lead application upgrades to Java 17+ and Spring Boot 3.x.
• Collaborate with stakeholders to translate requirements into solutions.

Skills

Java

Spring Boot

SQL

Relational databases

API specifications

Version control systems

Object-oriented programming

CI/CD pipelines

Job description

Responsibilities

• Design, develop, and maintain Java-based applications supporting taxation, account management, and investment processing
• Lead and execute application upgrades to Java 17+ and Spring Boot 3.x baseline
• Build and maintain calculation engines aligned with tax regulations across multiple countries
• Develop solutions supporting complex business processes, including integrations with tax authorities and generation of customer-facing reports
• Participate in the full software development lifecycle (SDLC), including: requirements analysis, design, development, testing and deployment
• Collaborate with financial analysts and business stakeholders to translate requirements into technical solutions

Requirements

• Experience with Java and Spring Boot upgrades, including migration projects
• Strong knowledge of: Java (preferably Java 21) and Spring Boot
• Experience with relational databases and SQL (e.g. PostgreSQL)
• Experience working with messaging technologies (e.g. JMS, MQ)
• Strong proficiency in Java frameworks (e.g. Spring, Hibernate)
• Experience working with API specifications such as OpenAPI and AsyncAPI
• Familiarity with version control systems (Git) and CI/CD pipelines
• Understanding of object‑oriented programming principles and software design patterns

Offer

• Private medical care
• Co‑financing for the sports card
• Constant support of dedicated consultant