Over a two-month period, contributed to MicrosoftDocs/azure-devops-yaml-schema by updating Maven task documentation to support JDK 21, enabling teams to adopt the latest Java version with minimal integration issues. This work involved extending allowed values in the YAML schema and improving documentation clarity using Java and Markdown. In the keycloak/keycloak repository, addressed a security vulnerability by fixing a password policy bypass, ensuring case-insensitive checks between usernames and passwords. Added comprehensive unit and integration tests to validate the fix, demonstrating a focus on backend development, security, and test-driven practices while enhancing authentication reliability and documentation consistency across both projects.