Developer – Billing Systems (REF5676S)

Join a team responsible for one of the most business-critical areas within Deutsche Telekoms 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.

Were actively working to merge fixed-line and mobile billing into a single modern platform while gradually retiring legacy systems. That means you wont be maintaining a static legacy-only system youll be part of a continuously evolving architecture undergoing real modernization.

Your responsibilities will include:

• Developing and maintaining microservices (REST APIs and UI components)
• UI development using the Vaadin (Java) framework
• Writing automated tests (JUnit Cucumber/Gherkin Robot Framework)
• Building and optimizing CI/CD pipelines in GitLab
• Deploying and running Docker containers on Kubernetes / OpenShift
• Ensuring reliable communication between services and integrations
• Writing custom scripts for database synchronization (MongoDB)
• Creating technical documentation and knowledge resources

Qualifications :

• Experience with Java / Spring Boot backend development
• Familiarity with our tech stack: Java Spring Boot MongoDB Oracle DB Shell Maven
• Experience with tools such as GitLab Jira Grafana Kibana VSCode / IntelliJ MongoDB Compass Postman (or equivalent) SQL Developer
• Business-level proficiency in English
• German is not required

Additional Information :

• Work on a large-scale system modernization project within an international corporate environment
• A modern cloud-native tech stack (Kubernetes/OpenShift)
• 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.

Remote Work :

No

Employment Type :

Full-time