Senior Application Developer - Java Spring Boot (m/f/d)
deutschetelekomitsolutionsslovakia
Košice, Košice Region, Slovakia (Slovak Republic) · Košice · Slovakia
Posted Jun 3, 2026
- Full-time
- Hybrid
- Telekom IT Slovakia
- Mid-Senior Level
deutschetelekomitsolutionsslovakia
Košice, Košice Region, Slovakia (Slovak Republic) · Košice · Slovakia
Posted Jun 3, 2026
Company Description Our brand Deutsche Telekom IT Solutions Slovakia entered the life of Košice region in 2006 under the name of T-Systems Slovakia and ever since has been inextricably linked with the region when became one of the founding members of Košice IT Valley. We have managed to grow from scratch to the second largest employer in the eastern part of the country with more than 3900 employees. Our goal is to proactively find new ways to improve and continuously transform into the type of company providing innovative information and communication technology services. Job Description Purpose Develops new and maintains existing applications in Java Spring Boot based on requirements of internal or external customers. Your project: You will be part of a B2B IT organization operating within an agile release train "Voice & Partner Products Provisioning". The final product enables the decomposition of product orders into service orders and the allocation and provisioning of underlying resources. Your work will involve developing solutions such as virtual cloud-based Private Branch Exchanges (PBXs) and provisioning Over-The-Top (OTT) services like WebEx, Microsoft Teams, Zoom, and more. Additionally, you will contribute to integrating these platforms into the comprehensive Deutsche Telekom products for business customers in Germany. Your team: You will join a newly established, cross-functional Scrum team based in Košice. We are committed to fostering a strong DevOps culture under the motto: "We build it, we run it." In this team, you will enjoy broad access to modern technology stack with freedom to choose (of course there will be some architectural guidelines), empowering you to make independent decisions while expecting a high level of ownership and commitment to delivery. The team primarily works remotely, with in-person meetings required for sprint demos, planning, and retrospectives (typically every two weeks for 1 day in our offices in Košice), as well as Program Increment (PI) planning sessions held approximately every 3–4 months for 3 days locally or abroad. To this position belongs following benefits: extra 2 days off, Various discounts on products and services (Internet, mobile services, etc.) and Home office/Telework – from the territory of the Slovak Republic and selected EU countries. WHAT WILL YOU DO? Analyze of customer’s requirements and propose overall application architecture incl. interfaces (e.g. REST API OAS), relation / document database structure, use of native cloud development approach etc. Perform complex business analysis in order to build application functionality easy for maintenance and future extension according to customer needs as business intelligent solution that implements business processes in automated form Develop backend applications or microservices according stories definition in chosen programming language (primarily Java Spring Boot or another Java application development framework) Beside new future development you will participate on application modernization, refactoring and decomposing of application from monolith to microservice architecture according to enterprise architecture guidelines Develop and run automated tests on various application levels, provides testing of programmed functionality before deployment in order to avoid bugs and ensure quality of code Write and update complex technical system documentation and business logic documentation (e.g. UML) Maintain application, support bug fixing Prepare GitLab CI/CD pipelines with DevOps engineers cooperation Perform deployments on cloud infrastructure, handle release management in order to provide regular upgrades of software Prepare and perform data migrations Contribute to knowledge base of developers Make proposals for optimization of processes Proactively manage problem solving and root cause analysis Mentor junior/medior developers Qualifications YOU WILL SUCCEED IF YOU: have experience with: with complex application landscape - 5 years programming Java Spring Boot - expert MapStruct, Lombok, Liquibase, Open API generator, WireMock GIT, Maven, Gradle build tools, UML SQL and NoSQL databases (PostgreSQL, MongoDB, FireStore) one of the following clouds: AWS, GCP or Open Telekom Cloud REST API and message based communication API first approach SCRUM software development methodology and JIRA are communicative, team player and have analytical thinking speak English - Upper intermediate (B2) Additional Information WHY SHOULD YOU CHOOSE US? We believe in balance between work and personal life. An attractive and extensive work-life balance portfolio guarantees lasting motivation for employees and thus a better quality of life, promotes physical and mental well-being and contributes to a positive work environment. All this with the aim of providing more freedom in reconciling work, career growth, private life and individual lifestyle. Therefore we offer to our employees over 25 different benefits to improve their personal and professional life in these areas: Financial benefits Benefits with focus on learning and development Benefits with focus on health and sport Benefits with focus on family and work – life balance Other benefits For more information about our benefits click to Benefits Salary 3100-3700€ /brutto. We are offering base salary depending on seniority level and previous experience of candidate. In addition to base salary we provide variable part and other financial benefits. Base salary will not be lower than 3100€ /brutto. Additional information * Please be informed that our remote working possibility is only available within Slovakia due to European taxation regulation.