Developed and delivered an S3 Performance Testing Framework for the aws/aws-sdk-cpp repository, enabling reliable benchmarking of AWS S3 and DynamoDB services. The framework introduced a class-based test structure and integrated utilities for generating test data, error logging, and SDK version retrieval. Leveraging C++ and CMake, the solution established a CMake-based build system with C++17 support, ensuring compatibility and maintainability. The work included code quality improvements such as optimizing data structures and refining build configurations. This foundation supports repeatable performance measurements, facilitating data-driven optimization and risk reduction for performance regressions, and enhances the reliability of performance testing within the project.