Worked on spring-projects/spring-security and spring-projects/spring-kafka, focusing on documentation and test engineering over a two-month period. Delivered a migration guide to help users transition from the Spring Security SAML Extension to built-in SAML 2.0 support, clarifying integration steps and highlighting feature differences using Java and adoc. Enhanced onboarding by providing practical configuration examples and documenting limitations. In spring-kafka, refactored ReplyingKafkaTemplateTests to improve validation and maintainability, replacing custom methods with assertThat() assertions and consolidating header checks. Emphasized modularity, readability, and checkstyle compliance, strengthening regression safety and future maintenance through disciplined unit testing and technical writing.