Backend Software Developer (m/f/d) Java/SpringBoot

Job ID: 744000146132789

Backend Software Developer (m/f/d) Java/SpringBoot

Košice

Professional

Regular

Deutsche Telekom System Solutions Slovakia

Your Task

We are looking for a Backend Developer/Engineer to join the team behind Charisma and help build, scale, and stabilize a solution that supports complex operational and rollout processes. You will work on backend services at the core of the solution, tackling challenges around microservices, integrations, data, performance, and system reliability. This is a hands-on engineering role where you will have the opportunity to improve both existing production services and the way new functionality is designed and delivered. You will be part of an agile delivery environment where backend, frontend, quality, and business experts work together to turn real business requirements into reliable software.

Responsibilities

• Design, develop, and continuously improve backend services using Java 17+ and Spring Boot
• Build and evolve microservices and REST APIs used by the Charisma solution
• Turn new business requirements into maintainable and scalable technical solutions
• Work on performance optimization and technical stabilization of production services
• Design data models and work with PostgreSQL, SQL optimization, and database migrations
• Apply engineering approaches such as Domain-Driven Design, Event-Driven Architecture, Clean Architecture, and established design patterns
• Design and document APIs using OpenAPI / Swagger
• Build and maintain integrations using REST and TARDIS
• Develop automated unit, integration, API, performance, and load tests
• Work with Docker, Kubernetes, Git, and CI/CD as part of the development and delivery lifecycle
• Improve application observability and troubleshooting using Prometheus, Grafana, LUMINA, OpenTelemetry, and logging
• Collaborate with frontend engineers, quality engineers, and business experts to deliver end-to-end functionality
• Contribute to further rollout activities and the continuous improvement of the overall solution

Your Profile

We are seeking a Backend Developer/Engineer with strong hands-on experience in Java development, microservices architecture, and database management. The ideal candidate should have solid knowledge of modern software engineering principles, automated testing, and DevOps practices, along with excellent collaboration and problem-solving skills.

Must Have Skills

• Strong hands-on experience with Java 17+
• Strong hands-on experience with Spring Boot
• Strong hands-on experience with Spring Framework
• Experience in developing and maintaining microservices
• Experience in developing and maintaining REST APIs
• Solid knowledge of PostgreSQL
• Solid knowledge of SQL
• Solid knowledge of data modeling
• Solid knowledge of performance optimization
• Experience with Spring Data JPA
• Experience with Hibernate
• Experience with Spring Security
• Experience with Spring Web
• Experience with Spring Validation
• Understanding of modern software architecture and engineering principles
• Understanding of Domain-Driven Design (DDD)
• Understanding of Event-Driven Architecture
• Understanding of Clean Architecture
• Understanding of design patterns
• Experience using Maven or Gradle for build and dependency management
• Familiarity with automated testing frameworks and tools
• Familiarity with JUnit 5
• Familiarity with Mockito
• Familiarity with Testcontainers
• Familiarity with API testing solutions
• Experience with performance and load testing of large-scale applications
• Practical experience with Git
• Practical experience with Docker
• Practical experience with Kubernetes
• Practical experience with CI/CD pipelines
• Understanding of the importance of observability, monitoring, and logging in building reliable applications
• Experience working with REST-based integrations
• Experience working with TARDIS
• Ability to solve technical challenges
• Ability to collaborate with team members
• Commitment to continuously improving the quality and performance of software solutions
• English language proficiency at a minimum B2 level

Nice to Have Skills

• Experience with AWS
• Knowledge of Kotlin
• Experience with Reactive Programming / WebFlux
• Knowledge of route optimization technologies

About Us

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.

Benefits

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

Salary: Final salary is negotiable.

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 €2,000 /brutto.

Additional Details

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

Job Benefits

Financial

• Base salary not lower than €2000/brutto
• Variable compensation component
• Additional financial benefits

Work-Life Balance

• Attractive and extensive work-life balance portfolio
• Over 25 different benefits to improve personal and professional life
• Remote working possibility (within Slovakia)

Professional Development

Benefits with focus on learning and development

Lifestyle & Wellness

• Benefits with focus on health and sport
• Programs promoting physical and mental well-being

Family Support

Benefits with focus on family and work-life balance