Projects

• Moved video calls from Vonage/OpenTok to WebRTC on Mediasoup to cut platform costs, and refactored the critical video components
• React Native + Expo apps for iOS, Android and web, with app state managed through React Context and SQLite for local data
• Node.js and GraphQL backend on PostgreSQL
• Rebuilt CI/CD on Expo EAS, shipping smaller changes as over-the-air updates instead of full store releases, with automated tests in Jest and Maestro
• Shipped SSO, including schema and index changes on the production users table

React Native · Expo · EAS · React Context · SQLite · Node.js · GraphQL · PostgreSQL · WebRTC · Mediasoup · AWS · Jest · Maestro

• Flutter apps integrated with native iOS components written in Swift
• Audio processing workflows built and optimized with FFmpeg
• Maintained the CI/CD pipelines that kept builds stable

Flutter · Dart · Bloc · Swift · FFmpeg · Stripe · SQLite

• iOS architectures with SwiftUI, Combine, RxSwift and Realm
• Research and development of a COVID-19 workplace monitoring solution with Bluetooth Low Energy and indoor positioning
• Code reviews across client projects

Swift · SwiftUI · Combine · RxSwift · Realm · Flutter · Bluetooth LE

• Native iOS (Objective-C, later Swift) and Android apps for riders and drivers, on a PHP/Laravel backend
• Arrivals at partner venues validated with Bluetooth beacons
• A CMS for running the business — venues, drivers and riders — where venues also managed their own settings
• Route optimization and shared rides, where much of the engineering time went
• Moved the database from MySQL to PostgreSQL to use PostGIS for service areas; tuned slow queries with EXPLAIN and moved high-volume driver-location writes to Redis

Objective-C · Swift · Android · PHP/Laravel · MySQL · PostgreSQL · PostGIS · Redis · Beacons