Senior Backend Software Developer - Java/Spring Boot (m/f/d)
Deutsche Telekom IT Solutions Slovakia2 months ago
Remote, SlovakiaSenior
Responsibilities
- Lead the design, development, and continuous improvement of backend services using Java 17+ and Spring Boot.
- Define and evolve microservices and APIs with a focus on scalability, maintainability, security, and operational reliability.
- Translate complex business and customer requirements into robust technical solutions.
- Drive performance optimization, technical stabilization, and root-cause analysis of production services.
- Design data models and lead PostgreSQL work including SQL optimization, database migrations, and data consistency.
- Apply Domain-Driven Design, Event-Driven Architecture, Clean Architecture, and established design patterns.
- Design, review, and document APIs using OpenAPI and Swagger.
- Lead and troubleshoot integrations using REST and TARDIS.
- Define and improve automated unit, integration, API, performance, and load testing strategies.
- Use Docker, Kubernetes, Git, and deployment automation to improve development and operational practices.
- Improve observability and troubleshooting using monitoring, logging, and related observability tools.
- Collaborate with frontend engineers, quality engineers, business experts, customers, stakeholders, architects, and delivery leads.
- Provide technical guidance, code reviews, mentoring, and engineering standards support.
- Contribute to rollout activities, technical planning, risk identification, and continuous improvement.
Requirements
- Extensive hands-on experience with Java 17+, Spring Boot, and the Spring Framework in production-grade enterprise applications.
- Strong experience designing, developing, and operating microservices and REST APIs in complex system landscapes.
- Advanced knowledge of PostgreSQL, SQL, data modeling, performance tuning, and database migration strategies.
- Deep experience with Spring Data JPA, Hibernate, Spring Security, Spring Web, and Spring Validation.
- Strong understanding of software architecture, engineering principles, Domain-Driven Design, Event-Driven Architecture, Clean Architecture, design patterns, and API design.
- Experience making technical design decisions and explaining trade-offs to technical and non-technical stakeholders.
- Experience with Maven or Gradle and build, dependency, and release management.
- Strong experience with automated testing using JUnit 5, Mockito, Testcontainers, and API testing tools.
- Proven experience with performance and load testing of large-scale applications and remediation of bottlenecks.
- Production experience with Git, Docker, Kubernetes, and deployment automation.
- Strong understanding of observability, monitoring, logging, alerting, and production troubleshooting.
- Experience with REST-based integrations and TARDIS.
- Excellent communication, customer collaboration, mentoring, and code review skills.
- English proficiency at a minimum B2 level.
- Preferred qualifications include AWS and cloud-native application design experience, Kotlin, Reactive Programming or WebFlux, route optimization technologies, technical workshop leadership, architectural documentation, technical roadmaps, and production readiness reviews.
Benefits
- More than 25 benefits covering financial support, learning and development, health and sport, family support, work-life balance, and other areas.
- Remote work is available within Slovakia due to European taxation regulations.
- The company promotes work-life balance, personal and professional development, and physical and mental well-being.
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.