1. Implemented and improved various features for the Paytm mobile app, including new features such as Paytm postpaid. As a backend developer, written scalable and testing solutions for the app. Understood the whole end-to-end module development process and ensured quality deliverables.2. Developed unit test cases and APIs for new features, increasing code coverage from 65% to 95%. Designed an alert system for infrastructure metrics, resulting in a decrease in server downtime by 10%.3. Collaborated with cross-functional teams to identify and rectify software defects, resulting in a 15% improvement in overall system reliability.