Tac Jiang

Architected and scaled a high traffic iOS app serving 5M+ users and processing 100M+ annual transactions in global markets, with support for 12 languages. Led core modules including user and vehicle management for fleets and individual users, and multi-channel payments (credit card, Apple Pay, PayPal) with PCI compliant security. Implemented GPS and Map parking features with real time search, low connectivity optimization, and BLE-based hardware interaction at parking meters. Developed camera-based features including credit card recognition, location number detection, and QR code scanning for seamless parking and payment workflows. Delivered companion apps for Apple Watch and CarPlay, enhancing driver accessibility and mobility. Implemented MVVM architecture supported by Core Data and RESTful APIs to enable modular and offline-capable performance. Automated CI/CD with Fastlane and Git, ensuring code quality through TDD with XCTest and XCUITest.

Architected and scaled a high-traffic iOS app serving 5M+ users across 12 languages, with core modules for user and vehicle management and PCI-compliant multi-channel payments. Implemented GPS-based parking features with real-time search, low-connectivity optimization, and BLE interaction with meters. Built camera-based payment workflows (credit card recognition, location number detection, QR scanning). Delivered companion apps for Apple Watch and CarPlay. Employed MVVM with Core Data and RESTful APIs for modular, offline-capable performance; automated CI/CD with Fastlane and Git; emphasized TDD with XCTest and XCUITest.

Built and deployed a global mobile payment app for 200K+ users across North America, Europe, and Asia. Developed core features including P2P transfers, currency conversion, merchant promotions, QR code scanning, and social integrations. Integrated online banking, credit card processing, and location services via RESTful APIs, working closely with backend teams. Designed responsive interfaces using multiple Storyboards, Auto Layout to support all iOS screen sizes. Managed App Store deployment and led a 3-person mobile team through delivery and iteration cycles.