Nikita Gupta worked on backend development for the juspay/clairvoyance repository, focusing on improving the accuracy of date-based analytics queries. She addressed an off-by-one error in the calculation of relative date ranges, ensuring that queries like "last X days" now include exactly X days, inclusive of today. By adjusting the start date logic to Today minus (X-1) days, she enhanced the reliability of data retrieval for analytics. This fix, implemented in Python, demonstrates her skills in prompt engineering and LLM integration, and reflects a careful approach to resolving subtle bugs that impact the correctness of time-based data analysis.