Worked on the MHSanaei/3x-ui repository, focusing on backend development using Go to address a critical compatibility issue. Implemented a fix that updated integer parsing logic to use int64, ensuring proper handling of large values on 32-bit architectures and preventing potential overflow errors. This change improved cross-platform reliability, particularly for legacy environments where integer overflows could cause runtime failures. The solution was delivered with careful validation to minimize risk to existing functionality and was committed after thorough testing. The work demonstrated attention to platform-specific details and contributed to the overall stability and maintainability of the codebase using Go.