Henry Hai developed foundational sub-user management capabilities for the alphauslabs/blueapi repository, focusing on scalable multi-tenant access control. He designed and implemented new SubUser and SubUserRole message types using Protocol Buffers, defining structured data models for sub-users, including IDs, parent associations, metadata, and roles. Leveraging gRPC, Henry introduced a GetSubUserMetadata RPC endpoint, enabling programmatic retrieval of sub-user metadata and supporting robust governance across services. His work centered on API development and protobuf schema design, laying the groundwork for future extensibility. Over the course of the month, Henry delivered one feature with no reported bugs, demonstrating depth in backend protocol design.