Worked on the cozystack/cozystack repository to deliver state synchronization improvements for the WatchList feature, focusing on reliable coordination across core Kubernetes resources. Developed the InitialEventsBookmarker, a Go-based helper that emits an initial-events-end bookmark, allowing WatchList clients to synchronize state for TenantSecret, TenantModule, and TenantNamespace resources. Refactored watch logic to integrate this helper across all relevant implementations, ensuring correct event sequencing and reducing client-side churn. Emphasized test-driven development by adding comprehensive unit tests to validate event flows. Updated release documentation to clarify apiserver behavior, ultimately enhancing HasSynced readiness and improving reliability for client-go informer consumers.