- Java 8/11/17/21
- Frameworks: Spring Framework (incl. Spring MVC, Spring Security and Spring Data), Spring Boot, Hibernate
- Messaging: Apache Kafka, RabbitMQ
- Testing frameworks: JUnit, AssertJ, Mockito, Rest Assured, Testcontainers
- Build tools: Maven, Gradle
- Databases: PostgreSQL, MongoDB
- CI/CD: Gerrit, Gitlab, Bitbucket, Jenkins
- Virtualization & orchestration: Docker, Kubernetes, OpenShift, Rancher