Java 17/21, Spring Boot, Spring Cloud, Hibernate, AWS (S3, ECS, EKS), Docker, Kubernetes, OpenShift, Helm, ArgoCD, Jenkins, Apache Kafka, REST APIs, Camunda, OAuth2, OpenID Connect, Keycloak, Okta, JUnit, Mockito, Testcontainers, Selenium, SOAPUI, Postman, Spring AI, LLM-Integration, Prompt Engineering, MCP