During November 2024, Nikolaos Angelopoulos focused on backend improvements for the grafana/mimir and grafana/dskit repositories. He addressed a race condition in Mimir’s Distributor High Availability startup by initializing the HA cache at startup and synchronizing state from the KV store, updating tests to match the new logic. In dskit, he developed a mock KV store client to enhance test observability and extended configuration options for memberlist-based KV stores. Working primarily in Go and YAML, Nikolaos applied skills in distributed systems, caching, and testing, delivering targeted, well-structured changes that improved reliability, configurability, and developer productivity across both projects.