Projects

Secure communication super app combining encrypted messaging, voice and video calling, and realtime collaboration. I build the mobile client across Flutter, native iOS, and Android: end to end encryption with secure key management, a zero knowledge backup vault, bidirectional gRPC streaming with a SQLite sync engine that keeps working offline, and calling built on WebRTC and CallKit.

Almost seven years on the patient, doctor, and internal staff apps at a US health tech startup running hybrid care from its own clinics in Ho Chi Minh City and Hanoi. I took them from Objective-C and Swift through the move to Flutter, and shipped the core care features: telemedicine video consultations on WebRTC and CallKit, realtime care chat, appointment booking that survives a dropped connection, Apple Health sync into the clinical record, and photo uploads that finish in the background.

Global iOS platform and internal libraries for Pizza Hut Digital Ventures, the in house startup building digital solutions for the brand's worldwide growth and modernization.

Projects for international clients across live streaming (ImHelo), social networking (iHeart Local), restaurant management (JPOS), and family sharing (Milky Chat). Ran the Objective-C to Swift migrations and built the shared UIKit components these apps were assembled from.