Senior Java Backend Developer @ Diverse CG Sp. z o.o. Sp.k.

Diverse CG Sp. z o.o. Sp.k.; Poland; On-site; PLN 120,000 - 180,000; Full time

Job summary

Diverse CG Sp. z o.o. Sp.k.

is seeking a skilled Java software engineer to design, develop, and maintain Java applications for pension and savings products. You will implement tax calculation engines across multiple countries, support complex business processes, and collaborate with financial analysts to translate requirements into robust solutions. Responsibilities include architecture design reviews, mentoring junior developers, and ensuring code quality with CI/CD pipelines and modern Java

Qualifications

• Experience with Java and Spring-based application development.
• Proficiency in relational databases, especially PostgreSQL.
• Hands-on experience with messaging technologies (JMS, MQ).
• Strong knowledge of Java frameworks including Spring and Hibernate.
• Familiarity with OpenAPI and AsyncAPI for data production/consumption.
• Experience with Git and CI/CD pipelines.
• Understanding of OO design patterns and programming principles.
• Ability to collaborate with cross-functional stakeholders.
• Strong analytical and problem-solving skills.
• Excellent command of English (spoken and written).

Responsibilities

• Design, develop, and maintain Java applications supporting pension and savings products.
• Build and enhance tax calculation engines across countries.
• Develop solutions for complex business processes, tax authority integrations, and customer reporting.
• Participate in requirements analysis, solution design, development, testing, and deployment.
• Collaborate with financial analysts to translate business requirements into technical solutions.
• Mentor developers and act as a code reviewer and design sparring partner.
• Promote practical engineering practices within the team.
• Use AI-assisted development and automation to improve productivity and quality.
• Contribute collaboration and analytical skills to solve technical challenges.

Skills

Java 21

Spring Boot

PostgreSQL

JMS/MQ

Hibernate

OpenAPI/AsyncAPI

Git

CI/CD

OO design

English

Tools

OpenAPI tooling

Git

CI/CD pipelines

JMS/MQ tooling

Job description

• Strong experience in Java 21 and Java-based application development


• Hands-on experience with Spring Boot and related Java frameworks


• Proven experience with relational databases and PostgreSQL SQL


• Practical experience with messaging technologies such as JMS, MQ, or similar protocols


• Strong proficiency in Java frameworks including Spring and Hibernate


• Knowledge of OpenAPI and AsyncAPI for producing and consuming data


• Familiarity with Git and CI/CD pipelines


• Understanding of software design patterns and object-oriented programming principles


• Ability to collaborate effectively with cross-functional stakeholders


• Strong analytical and problem-solving skills


• Very good command of English, both spoken and written

The consultant will be responsible for developing, enhancing and maintaining our Java-based applications that handle taxation, account management, and investment processing for our pension and savings products.

• Design, develop, and maintain Java applications supporting savings and investment products


• Build and enhance calculation engines ensuring compliance with tax regulations across multiple countries


• Develop solutions supporting complex business processes, tax authority integrations, and customer-facing reporting


• Participate in requirements analysis, solution design, development, testing, and deployment


• Collaborate with financial analysts to translate business requirements into technical solutions


• Mentor developers and act as a code reviewer and design sparring partner


• Promote practical engineering practices across the development team


• Use AI-assisted development and automation responsibly to improve productivity, quality, and learning


• Contribute strong collaboration and analytical skills to solve complex technical challenges

Requirements: Java, Spring, Hibernate, SQL