Java Developer – Billing Systems (REF5676S)

The largest ICT employer in Hungary, Deutsche Telekom IT Solutions (formerly IT-Services Hungary, ITSH) is a subsidiary of the Deutsche Telekom Group. Established in 2006, the company provides a wide portfolio of IT and telecommunications services with more than 5000 employees. ITSH was awarded with the Best in Educational Cooperation prize by HIPA in 2019, acknowledged as one of the most attractive workplaces by PwC Hungary’s independent survey in 2021 and rewarded with the title of 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.

Join a team responsible for one of the most business-critical areas within Deutsche Telekom's international group: billing systems. We deliver accurate, reliable, and flexibly configurable billing for fixed-line and mobile networks as well as mobile service providers — serving millions of customers.

We're actively working to merge fixed-line and mobile billing into a single, modern platform, while gradually retiring legacy systems. That means you won't be maintaining a static, "legacy-only" system — you'll be part of a continuously evolving architecture undergoing real modernization.

Your responsibilities will include:

• Developing software solutions and ensuring operational stability within an agile project setup
• Coordinating in an agile environment with the involved business units
• Analyzing and processing requirement documents
• Direct coordination with business departments and internal engineering teams
• Contributing to the implementation of new business and IT initiatives
• Analyzing and resolving production issues

• Experience with agile software development
• Java, Spring Boot
• Web technologies (e.g., JSON), with a focus on backend development
• Experience with cloud platforms (AWS, CaaS)
• Familiarity with development tools such as GitLab, Docker, Kubernetes, IntelliJ
• Experience implementing RESTful services and microservices; familiarity with TMF APIs is a plus
• Database expertise, ideally MongoDB, Oracle DB, or similar
• Frontend development experience
• Willingness to get familiar with a complex software landscape
• Python
• Experience with AI development tools
• Strong analytical and communication skills, in both written and spoken English
• German language skills are a strong plus and will make onboarding into the team significantly easier — however, they are not a hard requirement, and candidates without German are still very welcome to apply

• Work on a large-scale system modernization project within an international corporate environment
• A modern, cloud-native tech stack (AWS, Kubernetes)
• Production-grade, business-critical systems with real impact on customer experience
• A collaborative, agile team culture

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