Worked on the endless-sky/endless-sky repository to enhance test determinism and debugging efficiency by introducing new command-line configuration options. Developed in C++ with a focus on command line interface design and debugging, the work added the ability to specify a fixed pseudo-random number generator seed and configure the number of worker threads. This approach enabled reproducible test runs and improved concurrency control, facilitating more reliable continuous integration and easier issue diagnosis. While no bugs were fixed during this period, the feature laid a foundation for better resource management and performance tuning, supporting future stability and maintainability in the codebase.