Senior Java Backend Developer Java, Spring, Hibernate, SQL, OpenAPI Warszawa, Gdańsk, Gdynia

Diverse CG Sp. z o.o. Sp.k.; Poland; Remote; PLN 180,000 - 240,000; Full time

Benefits offered by this job

Private medical care

Co-financing for the sports card

Dedicated consultant support

Job summary

Diverse CG Sp. z o.o. Sp.k. is seeking a Java/Spring Boot engineer to upgrade applications to Java 17+ and Spring Boot 3.3.x, and to design and maintain Java solutions for savings and investments products.

You will work with PostgreSQL/SQL, JMS/MQ, OpenAPI/AsyncAPI, and CI/CD, collaborating with financial analysts to translate requirements into scalable software. Fluent English is required; the role offers ongoing support from a dedicated consultant.

Qualifications

• Proven experience in Java and Spring Boot upgrade projects.
• Strong proficiency in Java 21 and Spring Boot.
• Hands-on experience with PostgreSQL and SQL.
• Practical knowledge of messaging technologies such as JMS, MQ or similar.
• Strong understanding of Java frameworks including Spring and Hibernate.
• Experience with relational databases and SQL-based development.
• 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.
• Very good command of English, both spoken and written.

Responsibilities

• Upgrade applications to Java 17+ and Spring Boot 3.3.x baseline.
• Design, develop and maintain Java applications supporting savings and investments products.
• Build 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 activities.
• Collaborate with financial analysts to translate business requirements into technical solutions.

Skills

Java

Spring Boot

PostgreSQL

SQL

JMS/MQ

OpenAPI/AsyncAPI

Git/CI-CD

Hibernate

Design patterns

English

Tools

PostgreSQL

MQ

Git

CI/CD pipelines

Job description

As a recruitment company, DCG understands that every business is powered by experienced professionals. Our management style and partnership approach enable us to meet your needs and provide continuous support. Due to our ongoing growth and the large number of recruitment projects we undertake for our partners, we are currently looking for:

Responsibilities:

• Upgrade applications to Java 17+ and Spring Boot 3.3.x baseline
• Design, develop and maintain Java applications supporting savings and investments products
• Build 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 activities
• Collaborate with financial analysts to translate business requirements into technical solutions

Requirements:

• Proven experience in Java and Spring Boot upgrade projects
• Strong proficiency in Java 21 and Spring Boot
• Hands-on experience with PostgreSQL and SQL
• Practical knowledge of messaging technologies such as JMS, MQ or similar
• Strong understanding of Java frameworks including Spring and Hibernate
• Experience with relational databases and SQL-based development
• 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
• Very good command of English, both spoken and written

Offer:

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

Personal Consulting Agency (License No. 4642)