Senior Java Developer

We are looking for a driven software engineer who is not only tech‑savvy but also a people‑oriented team player, ready for a stable and long‑term collaboration. The project focuses on developing a bonus system within a gaming platform - although the solution has been around for some years, it is continuously being expanded, refactored, and optimized wherever needed (new development: 70%). This experienced developer we are looking forward to hiring will not only build new features but should also be comfortable working with legacy code - we need someone who can read it, understand it, and modernize it effectively.

The tech stack: Java (8–25), Tomcat, Maven, Spring, Kafka, MongoDB, Guava, Guice, MySQL, Nginx, Linux, Jenkins, Git, Docker, Kubernetes, Google Cloud.

You will join an international, cross-functional team (Poland, Malta, Sweden, Turkey).

In this position you will:

• Contribute to the evolution of a large‑scale online gaming platform, shaping new capabilities and enhancing existing ones,

• Work across multiple layers of the system, from backend services to integrations with third‑party providers,

• Develop internal modules and subsystems that power core business functionality,

• Potentially support UI development for both desktop and mobile experiences,

• Partner closely with product and business teams to translate ideas into well‑designed, user‑focused features,

• Build solutions using a modern, diverse tech stack that includes Java, Kafka, Docker, MongoDB, MySQL, React, and Spring Boot,

• Dive into a mature codebase, evaluate its architecture, and introduce thoughtful, incremental improvements to keep it modern and maintainable.

Your experience:

• Deep, hands‑on expertise in Java (6+ years of commercial experience),

• Confidence in navigating and improving legacy systems, including refactoring and introducing reliable test coverage,

• Strong understanding of SQL and solid experience working with relational databases,

• A collaborative mindset, thriving in close cooperation with Developers, QAs, and Product Owners to deliver meaningful outcomes,

• Natural curiosity — you enjoy exchanging ideas, learning from teammates, and contributing your own insights,

• Excellent communication skills, with strong proficiency in written and spoken English.

It is a hybrid role in Katowice (3 remote days/week). The benefit package includes private medical care, a sports card, 70% of tax-deductible costs.