Senior Java Developer

Avenga; Polska; Hybrid; PLN 240,000 - 360,000; Full time

Job summary

Avenga is seeking a Senior Java Backend Developer for a long-term project in the Polish banking sector. You will work on large-scale backend solutions, focusing on distributed systems, microservices, and API design. The role is hybrid with 1 day per week in the office across Warsaw, Łódź, Gdańsk, Wrocław, Poznań, Kraków, Lublin and Szczecin.

You’ll work with Java, Spring Boot, Hibernate, SQL databases, REST APIs, and modern CI/CD pipelines. Polish language at B2+/C1 level is required.

Qualifications

• Strong commercial experience with Java, ideally Java 17/21.
• Strong knowledge of Spring Boot and the Spring ecosystem, including Spring MVC, Spring Data JPA and Spring Security.
• Experience with Hibernate / JPA.
• Good knowledge of SQL and relational databases (Oracle, PostgreSQL or MS SQL Server).
• Experience designing and developing REST APIs.
• Experience with messaging technologies such as Kafka, JMS or RabbitMQ.
• Hands-on experience with microservices.
• Experience with Docker and Kubernetes or OpenShift.
• Experience with Git, Maven or Gradle and CI/CD.
• Experience with unit and integration testing.
• Understanding of application security, scalability and high-availability systems.
• Fluent Polish.

Responsibilities

• Design, develop and maintain backend services using Java and Spring.
• Design and evolve REST APIs and microservices.
• Develop synchronous and asynchronous integrations.
• Contribute to scalable, highly available and secure solutions.
• Write unit and integration tests and maintain high code quality.
• Participate in code reviews and technical discussions.
• Analyse logs, troubleshoot issues and continuously improve existing solutions.

Skills

Java

Spring Boot

Hibernate / JPA

SQL

REST APIs

Microservices

CI/CD

Tools

Docker

Kubernetes/OpenShift

Git

Maven/Gradle

Job description

Avenga is an international engineering firm helping businesses operate with AI at the core. With 6,000+ experts worldwide, we combine engineering expertise with AI-native thinking to turn ambitious ideas into real-world impact across industries, technologies, and markets.

At the core of the role

We are looking for a Senior Java Backend Developer to join a long-term project in the Polish banking sector.

You will work on large-scale backend solutions, contributing to the development and evolution of distributed systems and microservices. The role combines hands‑on Java development with API and microservice design, integrations, performance, scalability, security and code quality.

Please note that this is a hybrid role. We expect on average 1 day per week from the office, with the following locations available: Warsaw, Łódź, Gdańsk, Wrocław, Poznań, Kraków, Lublin and Szczecin.

The role also requires Polish at B2+/C1 level.

Core skills you’ll bring

• Strong commercial experience with Java, ideally Java 17/21
• Strong knowledge of Spring Boot and the Spring ecosystem, including Spring MVC, Spring Data JPA and Spring Security
• Experience with Hibernate / JPA
• Good knowledge of SQL and relational databases such as Oracle, PostgreSQL or MS SQL Server
• Experience designing and developing REST APIs
• Experience with messaging technologies such as Kafka, JMS or RabbitMQ
• Hands‑on experience with microservices
• Experience with Docker and Kubernetes or OpenShift
• Experience with Git, Maven or Gradle and CI/CD
• Experience with unit and integration testing
• Understanding of application security, scalability and high‑availability systems
• Fluent Polish

Nice-to-have

• Experience in banking, financial services or transactional systems
• Knowledge of payment processes
• Experience with SonarQube, Nexus or Artifactory

The impact you'll create

• Design, develop and maintain backend services using Java and Spring
• Design and evolve REST APIs and microservices
• Develop synchronous and asynchronous integrations
• Contribute to scalable, highly available and secure solutions
• Write unit and integration tests and maintain high code quality
• Participate in code reviews and technical discussions
• Analyse logs, troubleshoot issues and continuously improve existing solutions

What supports your journey

People are at the core of Avenga. We provide equal opportunities regardless of race, ethnicity, gender identity, sexual orientation, disability, age, religion, or any other characteristic. We are committed to a respectful environment where everyone can be themselves, share their ideas, and feel that they belong.