Worked on the smithy-lang/smithy repository to deliver enhanced multi-variable expansion within build configuration files. This involved refining the regular expression logic for parsing inline variables, enabling robust substitution of multiple variables, including both environment and user-defined variables, directly within configuration strings. The implementation was supported by a comprehensive test suite in Java, ensuring accurate and regression-free variable expansion. By focusing on build system configuration and rigorous testing, the work improved reliability and consistency during builds and deployments. The approach demonstrated careful attention to detail in regex-based parsing and integration with continuous integration pipelines for robust configuration management.