• Acted as a tech lead in Wallet and Kroger Pay team and develop the brand new feature Fuel Pay for contactless payment in the Fuel Center.• Used CoreNFC framework to implement NFC scanning to fetch the pump info from NFC chip and autofill all data in the payment confirmation page.• Implemented Siri shortcut for Kroger Pay, which motivated users to use Kroger Pay for contactless payment.• Acted as a technical lead in iOS Checkout and Cart team, assist with providing the solution and working with other teams’ developer.• Refactor the checkout flow and cart flow to satisfy the new business requirements, Such as “ship to home”, “did you forget items”. • Integrated InAuth framework and ThreatMetrix framework to do the fraud check in the KrogerPay and Checkout.• Used Lottie iOS framework to display animation service call loading state.• Worked on integrating FaceID/TouchID to allow user to use the biometric ID to sign into the app and make purchases conveniently.• Migrated existing Objective C code to Swift code for future maintenance.• Implemented two-factor authentication to allow user to use Instacart delivery on Kroger App.• Used specially designed Analytics Tool to gather important app-related data for better product understanding and improve product quality.• Performed the error handling and created user-friendly interface.