Worked on the roc-lang/roc repository to enhance numeric capabilities by implementing foundational square root support for the RocDec decimal type. Leveraged Zig to create a basic sqrt function using the language’s floating-point operations, focusing on correctness and reliability for financial and numeric computations. Developed comprehensive tests to validate the new functionality across representative inputs, ensuring robust coverage and clear commit history. The work emphasized core library development, numeric types, and testing practices, laying the groundwork for future performance improvements. This contribution addressed business needs for precise decimal operations and improved developer confidence through systematic validation and maintainable code structure.