YUNFU ZHANG

Responsibilities:

• Collaborated with the GroupMe iOS development team to develop and enhance the GroupMe chat application for iOS.
• Applied various design patterns, including MVC, MVVM-C, to create implementation plans and manage requirements changes.
• Developed and integrated new features, such as multiple images uploads, pin messages, pin chats, campus groups, discovery features, message search, read receipts, group themes, and group-level avatars, .etc.
• Partnered with the iOS design team and cross-platform developers to rewrite the GroupMe UI using Swift, based on new UX designs.
• Integrated multiple third-party libraries, including Mixpanel, OneSignal, Statsig, AppCenter, and HockeyApp, into the GroupMe iOS application, and implemented third-party login methods such as Facebook, Apple, and Microsoft logins.
• Enhanced application security by implementing two-factor authentication (2FA) and age gate checks, and collaborated with the Microsoft support team to enable ESRP signing for the beta app.
• Collaborated closely with the GroupMe product manager to implement comprehensive telemetry codes for detailed data measurement and analysis.
• Resolved numerous production bugs and conducted extensive testing and debugging using HockeyApp and TestFlight prior to each release.
• Maintained the application build pipeline, updated build scripts, and managed iOS development certificates, profiles, and device management.
• Mentored a summer intern, providing guidance on the codebase and work processes, and assisted in completing the new group details page for the GroupMe iOS application.

Responsibilities:

• Collaborated with the mobile team to develop new iOS applications for local police, fire departments, and EMS.
• Developed in-car applications used by local police and fire departments to improve operational efficiency.
• Implemented a major map screen using the Mapbox framework for real-time location tracking and navigation.
• Integrated an e-ticket feature with Zebra Bluetooth printers, streamlining the ticketing process.
• Enabled real-time dispatch status monitoring, call for service management, and detailed call displays.
• Developed remarks and history search functions with filters, facilitating efficient data retrieval.
• Implemented a driver license scanner using the Pppdf417 framework, enhancing functionality and user convenience.
• Created and maintained the web-service backend using the .NET framework, ensuring robust backend support.