During March 2025, Buwei Cui refactored test infrastructure across five major Go repositories, including CosmWasm/wasmvm, OffchainLabs/nitro, rollkit/rollkit, pulumi/pulumi, and ChainSafe/gossamer. He replaced manual temporary directory management in tests with Go’s t.TempDir, automating cleanup and improving test isolation. This approach reduced boilerplate code, minimized resource management errors, and enhanced CI reliability. By standardizing testing patterns and adopting Go best practices, Buwei improved maintainability and onboarding across diverse codebases. His work demonstrated strong skills in Go development, refactoring, and testing, delivering deeper reliability and consistency to the test suites while addressing both feature and bugfix needs.