Developed and delivered a security-focused feature for the argoproj/argo-cd repository, implementing masking of Kubernetes Secrets in server-side diff responses to prevent sensitive data exposure during review workflows. This work involved backend development and API enhancements using Go, with careful attention to preserving existing functionality and maintaining security properties throughout the integration process. The feature was contributed via a fork merge, reflecting collaboration with external maintainers and adherence to secure merge workflows. Emphasis was placed on robust testing and Docker/Git hygiene, ensuring that the new masking logic operated reliably within the broader Kubernetes ecosystem without introducing regressions or vulnerabilities.