Backend Software Developer - Java/SpringBoot (m/f/d)
Deutsche Telekom IT Solutions Slovakia2 months ago
Košice, SlovakiaSenior
Responsibilities
- Design, develop, and continuously improve backend services using Java 17+ and Spring Boot.
- Build and evolve microservices and REST APIs for the Charisma solution.
- Translate business requirements into maintainable and scalable technical solutions.
- Optimize performance, stabilize production services, and improve system reliability.
- Design data models and work with PostgreSQL, SQL optimization, and database migrations.
- Apply Domain-Driven Design, Event-Driven Architecture, Clean Architecture, and established design patterns.
- Design and document APIs using OpenAPI and Swagger.
- Build and maintain REST-based integrations, including TARDIS.
- Develop automated unit, integration, API, performance, and load tests.
- Use Docker, Kubernetes, Git, and CI/CD throughout the development and delivery lifecycle.
- Improve observability and troubleshooting using monitoring, logging, Prometheus, Grafana, LUMINA, and OpenTelemetry.
- Collaborate with frontend engineers, quality engineers, and business experts to deliver end-to-end functionality.
- Contribute to rollout activities and continuous improvement of the overall solution.
Requirements
- Strong hands-on experience with Java 17+, Spring Boot, and the Spring Framework.
- Experience developing and maintaining microservices and REST APIs.
- Solid knowledge of PostgreSQL, SQL, data modeling, and performance optimization.
- Experience with Spring Data JPA, Hibernate, Spring Security, Spring Web, and Spring Validation.
- Understanding of Domain-Driven Design, Event-Driven Architecture, Clean Architecture, and software design patterns.
- Experience with Maven or Gradle for build and dependency management.
- Familiarity with JUnit 5, Mockito, Testcontainers, and API testing solutions.
- Experience with performance and load testing for large-scale applications.
- Practical experience with Git, Docker, Kubernetes, and CI/CD pipelines.
- Understanding of observability, monitoring, and logging for reliable applications.
- Experience with REST-based integrations and TARDIS.
- English proficiency at a minimum B2 level.
- AWS experience, Kotlin knowledge, Reactive Programming/WebFlux experience, and route optimization technology knowledge are preferred.
Benefits
- More than 25 benefits covering financial support, learning and development, health and sport, family support, work-life balance, and other areas.
- Base salary is negotiable based on seniority and previous experience, with a stated minimum of €2000 gross plus variable compensation and other financial benefits.
- Remote work is available only within Slovakia due to European taxation regulations.
Tech Stack
Categories
About Deutsche Telekom IT Solutions Slovakia
Deutsche Telekom IT Solutions Slovakia provides IT outsourcing and managed services to corporate clients, with specialties in cloud, applications, SAP, network, and service management. Operating as part of Deutsche Telekom Group, it serves customers primarily in Germany and across the EU, delivering end-to-end enterprise processes such as order-to-cash and procure-to-pay. The company is headquartered in Košice‑Juh, Slovakia, and combines consulting, project delivery, and ongoing operations support.