Varun's responses throughout the interview exhibit a mix of positive, neutral, and slightly negative sentiments. His enthusiasm and detailed explanation of his professional experience and methodologies suggest a positive sentiment, especially in responses like R-4 and R-5. However, instances of uncertainty or inability to recall specific details, as seen in R-8, R-18, R-20, R-21, and R-23, introduce a neutral to negative sentiment. The overall sentiment is thus categorized as mixed due to these variations.