Developed and maintained a comprehensive application for two cellular operators, facilitating product and service management, balance payment, online shopping, adhering to Agile methodologies.• Developed high-performance iOS applications by efficiently managing data with GraphQL, utilizing Alamofire for network communication, and implementing caching strategies.• Introduced CI/CD pipelines, reducing release cycle times from 7 days to 5 days, facilitating faster app delivery to users via the AppStore.• Improved the app's Daily Active Users (DAU) by 12% through performance enhancements and a more responsive user experience.

Contributed to the development of a business management and support application.• Improved data consistency and reliability by implementing CoreData, resulting in a 19% reduction in data errors.• Designed Custom UI elements, resulting in a 12% increase in user stickiness, adhering to the company's design standards.