Contributed to the microsoft/presidio repository by developing a configurable entity parameter for the PhoneRecognizer, expanding its ability to identify a wider range of phone-related entities beyond standard phone numbers. This enhancement was implemented using Python and focused on back end development, with careful attention to unit testing to ensure reliability. The work improved the flexibility of data extraction processes, supporting compliance and risk management workflows that require nuanced entity recognition. Collaboration with cross-functional teams was evident throughout the open-source contribution, and the changes were delivered through clear, auditable commits that integrated seamlessly into the existing machine learning and NLP pipeline.