경험 중심 1인칭 답변
The biggest mistake I've made was missing a critical deadline in a team project because I underestimated how long data cleaning would take. I had assumed the data was ready to analyze, but it turned out there were many inconsistencies and missing values that required significant time to fix. As a result, the team had to rush the final analysis, and the quality suffered. To recover, I stayed late to fix the most critical data issues and communicated clearly with the team about what we could and couldn't deliver on time. After the project, I changed my approach by always building in a buffer for data preparation and flagging potential issues early. The experience taught me that estimating time accurately requires understanding each step in detail, not just the outcome. I now always break tasks into smaller stages and estimate each one separately.