During March 2025, Hoang worked on the cosmos/cosmos-sdk repository, focusing on enhancing stability, configurability, and consensus alignment in blockchain backend systems. He introduced a CLI flag for consensus key algorithm selection at genesis, improved transaction size calculations to match CometBFT consensus requirements, and implemented robust error handling for gRPC queries. Using Go and leveraging Cosmos SDK, Hoang addressed concurrency issues in BaseApp initialization and extended deterministic transaction checking logic. His work included code cleanup, documentation updates, and test coverage improvements. These contributions deepened the reliability and maintainability of the codebase, reflecting strong backend and blockchain development expertise.