Robert Xu developed a Custom Index Management API for the viamrobotics/api repository, focusing on enabling create, list, and delete operations for custom indexes. He defined Protocol Buffer messages and enums to represent index operations, then established a gRPC service surface to support these actions programmatically. To ensure broad accessibility, Robert implemented HTTP gateway mappings, allowing the API to be consumed over REST and facilitating cross-language client integration. Working primarily with Go, Protocol Buffers, and gRPC, he laid the groundwork for future index-related features. The work demonstrated depth in API design and protocol interoperability, though it was limited in scope.