Worked on the mrousavy/swift repository to enhance the Swift compiler’s SIL optimizer, focusing on improving the handling of optional types and escape analysis. Leveraged C++ and Swift to refactor the ValueDefUseWalker, enabling more efficient and accurate escape analysis, particularly around unchecked reference casts. Refined the bridged SILType implementation to improve type interoperability and correctness across compiler components. Expanded the test suite to cover edge cases involving optionals and unchecked casts, reducing risk and increasing confidence in optimization safety. The work demonstrated depth in compiler optimization, type systems, and testing, resulting in more robust and maintainable compiler infrastructure.