Backend Software Engineer (REF4773M)

DeutscheTelekomITSolutions

Budapest, , Hungary Hybrid permanent

Posted: January 29, 2026

Job Description

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.

Tasks:

• Developing, maintaining and supporting backend microservice applications using• Java 25
• Spring Boot 3.5 (with Reactive stack)
• Gradle 9.1
• JUnit 5 testing framework for unit and integration at development side
• deploying to Kubernetes / Helm / AWS EKS Cluster
• Gitlab for CI/CD, using Gitlab Ultimate Features (code quality, dependency scanning) focusing on PSA requirements and vulnerabilities
• Elasticsearch and Kibana for storing logs
• Grafana and Prometheus for charts

• Designing, developing, testing, and documenting RESTful and Reactive APIs using latest Spring WebFlux
• Efficient collaboration with databases (PostgreSQL), including writing optimized SQL queries
• Ensuring code quality through automated testing using JUnit 5 and integration tests, also leveraging WrappedMockService from the okhttp3 package for mocking external dependencies
• Regular participation in code reviews, technical discussions, and architecture refinement
• Working closely with testers and architects to ensure high-quality deliverables
• Operation and support tasks performed occasionally during regular working hours (no on-call or overtime work expected)

• Higher education degree in engineering, computer science or related field
• At least 3 years of professional experience in backend Java development
• In-depth knowledge of Spring Boot 3, with strong focus on Reactive programming (Spring WebFlux)
• Experience building and maintaining microservices architectures and developing scalable REST and reactive APIs
• Intermediate knowledge of SQL databases (PostgreSQL preferred)
• Experience with Elasticsearch and Kibana for logging and monitoring
• Daily use of JIRA for task and issue tracking
• Daily use of version control systems, preferably Git
• Basic DevOps knowledge, for example Docker and CI/CD pipelines (GitLab CI, Jenkins)
• Strong problem-solving skills and ability to work independently as well as part of a team
• Excellent communication skills, flexibility, and a continuous learning mindset

Advantages:

• Experience working with GitLab repositories and pipelines
• Familiarity with TARDIS / EventHorizon tools/platforms
• Advanced knowledge of JUnit 5 testing framework and integration test practices in Java
• Hands-on experience with AWS cloud services (basic level)
• Knowledge of Reactive Java libraries and paradigms beyond WebFlux

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

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