Backend Developer (REF4978I)

The Digital Hub Massenmarkt Billing is responsible for providing high-quality invoice generation and billing services for fixed-line, mobile, and mobile service provider (MVNO) products. Our mission is to ensure an excellent customer experience by delivering accurate, flexible, and future-proof billing solutions across the company.

As part of our Future Billing transformation, we are consolidating fixed-line and mobile billing chains into a single, modern billing landscape while gradually phasing out legacy systems. To strengthen our team, we are looking for a Senior Java Developer with a strong quality mindset and a passion for building reliable, business-critical systems.

Your Responsibilities:

• Design, develop, enhance, and maintain Bill Generation Management Services and Online Counting & Charging applications
• Ensure high code quality through code reviews, testing, refactoring, and documentation
• Actively support all phases of the development lifecycle:
  • Requirements analysis
  • Technical design
  • Implementation
  • Testing and quality assurance
• Contribute to the modernization of the billing system landscape and the consolidation of fixed-line and mobile billing chains
• Collaborate closely with other billing chains and cross-functional teams to continuously improve customer experience
• Work in an agile (Scrum) environment as part of a well-established, collaborative team

• Strong ability to design, write, and maintain clean, maintainable code
• In-depth knowledge of:
  • Java
  • Spring Boot
  • Maven or Gradle
  • GitLab and CI/CD pipelines
  • Agile/Scrum methodologies

Nice-to-have experience:

• Cloud environments (e.g. AppAgile or similar)
• MongoDB and MongoDB Compass
• JIRA
• Unit testing frameworks and test automation
• Performance testing
• Refactoring large or legacy codebases

Language Skills

• English – required (working language)
• German and/or Hungarian – an advantage

Personal Skills

• Proactive mindset with a high level of ownership
• Strong team player with excellent communication skills
• Enthusiastic about bringing new ideas into a stable, experienced team
• Quality-driven and motivated to work on mission-critical systems

* Please be informed that our remote working possibility is only available within Hungary due to European taxation regulation.