This project reinforced that late-stage usability testing can still meaningfully improve a product when the research is tightly focused and recommendations are grounded in launch realities. By testing with the app’s core audience and turning user behavior into clear themes, clips, and evidence, I helped the team see issues that had been difficult to recognize from inside the product organization. The strongest findings were not isolated interface defects, but gaps in the information users needed to understand auctions, track bidding, and make confident purchasing decisions. I also learned that effective research at this stage is as much about prioritization and persuasion as discovery. With only two weeks before launch, success meant distinguishing essential fixes from longer-term opportunities and translating broad user frustrations into changes the team could realistically deliver. Rather than treating the deadline as a reason to limit research, I used it as a constraint for making the findings more focused, actionable, and influential.