Over a two-month period, contributed to the NREL/ssc and NREL/SAM repositories by delivering nine new features focused on financial modeling, performance optimization, and configuration management. Refactored depreciation and investment tax credit calculations in C++ to improve computational efficiency and maintainability, moving logic outside inner loops and modularizing functions for clarity. Enhanced test coverage using data-driven JSON inputs and expanded automation for financial model validation. Streamlined cost estimation workflows by removing legacy modules and simplifying wind power cost configuration. Addressed build system stability and improved API integration, leveraging CMake and Python to support scalable, reliable energy system modeling and ongoing codebase maintainability.