As Hungary’s most attractive employer in 2025 (according to Randstad’s representative survey), Deutsche Telekom IT Solutions is a subsidiary of the Deutsche Telekom Group. The company provides a wide portfolio of IT and telecommunications services with more than 5300 employees. We have hundreds of large customers, corporations in Germany and in other European countries. 
DT-ITS recieved the Best in Educational Cooperation award from HIPA in 2019, acknowledged as the the Most Ethical Multinational Company in 2019. The company continuously develops its four sites in Budapest, Debrecen, Pécs and Szeged and is looking for skilled IT professionals to join its team.

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

Requirements

• 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

Budapest