Worked on the spring-projects/spring-integration repository, focusing on enhancing the Redis module’s null-safety and overall code robustness. The primary effort involved migrating nullability annotations from org.springframework.lang.Nullable to org.jspecify.annotations.Nullable and applying @NullMarked to package-info files, aligning the codebase with modern null-safety standards. Addressed null-safety checks and suppressions to improve maintainability and reduce the risk of null-related issues in future development. Utilized Java and JSpecify to implement these changes, ensuring safer API usage for downstream consumers. No major bug fixes were required during this period, as the work centered on proactive codebase modernization and reliability improvements.