Hyeokhee worked on the QuantConnect/Documentation repository, focusing on improving the reliability of ETF constituents universe selection. During this period, Hyeokhee identified and fixed a bug in the LargestWeightSPYETFUniverseSelectionModel by ensuring the symbol argument was correctly passed to the superclass constructor, which prevented potential reference errors and stabilized the selection logic. The solution involved careful debugging of Python object-oriented code and updating related HTML documentation to clarify the ETF constituents behavior for users. This targeted fix reduced production risk and improved user confidence in ETF universe results, demonstrating attention to detail in both code maintenance and technical documentation.