Worked on the google/xls repository to enhance the reliability of fixed-point arithmetic by refactoring the fixed_point::sub function in DSLX and XLS Assembly. Addressed a critical bug in subtraction by implementing correct bit-growth handling, including an overlap check to determine when an extra bit is required. Expanded the test suite to validate edge cases such as overflow and non-overlapping operands, ensuring robust numerical correctness. This improvement reduced downstream risk in analytics and formulas dependent on precise bit-growth behavior. Demonstrated technical rigor in compiler development, fixed-point arithmetic, and testing, contributing to the overall stability and accuracy of the codebase.