Nikita Gupta worked on backend development for the juspay/clairvoyance repository, focusing on improving the accuracy of date-based analytics queries. She addressed a subtle off-by-one error in the calculation of relative date ranges, ensuring that queries like "last X days" now include today and cover exactly X days. By adjusting the start date logic to use Today minus (X-1) days, she enhanced the reliability of data retrieval for analytics. This fix, implemented in Python, demonstrates careful attention to detail and a strong grasp of prompt engineering and LLM integration, contributing to more precise and dependable backend data processing.