• Designed and built microservice architectures with Spring Boot (Java 8, 11 and 17), exposing REST APIs and integrating with external SOAP services. • Developed web applications with React and Thymeleaf, and cross-platform mobile apps with React Native (Hooks, Context API, Axios). • Implemented authentication and authorization with Keycloak, LDAP, OAuth 2.0 and JWT, including role-based access control. • Integrated Alfresco document management and e-signature platforms, and designed document workflows. • Built asynchronous, event-driven communication between services using Kafka and ActiveMQ. • Deployed and managed development, staging and production environments on Docker, Tomcat and JBoss, with CI/CD pipelines in Jenkins and GitHub Actions. • Administered Linux servers over SSH, including secure tunnels and connectivity across hybrid infrastructure. • Designed data models and tuned application and SQL query performance on Oracle and PostgreSQL. • Documented APIs with Swagger/OpenAPI, wrote technical documentation, and worked in Scrum teams using Git.

● Built ALV reports and custom transactions for SAP ERP, and supported technical documentation and unit testing.

● Developed PHP modules (CodeIgniter) backed by MySQL, with dynamic forms and JavaScript / jQuery validation.

● Repaired hardware, installed operating systems and software, configured LAN/WLAN networks and provided end-user support.