Worked on reliability and stability improvements in Kubernetes and containerd, focusing on pod lifecycle management and container image handling. Addressed concurrency issues in the kubernetes/kubernetes repository by restructuring the WaitForAllPodsUnmount flow, replacing goroutines with a function-slice pattern for error aggregation and adding synchronization to resolve race conditions. Enhanced test coverage for pod resource management by introducing new client and server test cases, and fixed UTF-8 truncation in the expansion module to support internationalization. In containerd/containerd, improved image volume handling within user namespaces by ensuring correct UID/GID mappings and enforcing read-only access, utilizing Go, Kubernetes, and concurrent programming.