During January 2025, Xujikang contributed to the evmos/evmos repository by developing a targeted test to enhance EIP-712 legacy transaction handling. He implemented TestLegacyWrapTxToTypedData in Go, focusing on verifying the correct transformation of Cosmos SDK transactions into EIP-712 typed data, including validation of domain and message fields as well as expected types. This work improved the reliability of cross-chain signing and interoperability with Ethereum-style protocols. By increasing test coverage for the EIP-712 legacy path, Xujikang enabled earlier regression detection and provided greater confidence in protocol changes, demonstrating depth in blockchain development, EVM integration, and testing practices.