Projects

• Rewrote the app from an MVP whose business rules lived inside the UI components — moved that logic out of the components, managed app state with the Context API and upgraded React Native along the way
• Took it from iOS-only to fully working iOS, Android and web apps on one React Native + Expo codebase, with SQLite for local data
• Integrated Expo EAS and automated CI/CD with GitHub Actions — the pipeline tells apart changes that need a new store build from smaller ones shipped straight to users as over-the-air updates
• Introduced automated testing — Jest for unit tests and Maestro for end-to-end tests
• Moved video calls from Vonage/OpenTok to WebRTC on Mediasoup to cut platform costs, and refactored the critical video components
• Node.js and GraphQL backend on PostgreSQL; shipped SSO, including schema and index changes on the production users table

React Native · React · Expo · EAS · OTA updates · Context API · SQLite · GitHub · GitHub Actions · CI/CD · Jest · Maestro · Node.js · GraphQL · PostgreSQL · WebRTC · Mediasoup · AWS

• Flutter apps for iOS and Android, with state managed in Bloc and Cubits, integrated with native iOS components written in Swift
• Audio processing with FFmpeg in native iOS and Android code, called from Flutter through platform channels
• Maintained the CI/CD pipelines that kept builds stable

Flutter · Dart · Bloc · Cubit · Swift · FFmpeg · Platform channels · iOS · Android · Stripe · SQLite

• Mobile and web apps with React Native, Expo and React, with state managed in MobX
• Shipped app updates with Expo EAS, including over-the-air updates
• Integrated APIs and backend services for operational workflows
• Coached and mentored teammates as a technical lead

React Native · Expo · EAS · OTA updates · React · MobX · MongoDB · Firebase · Python

• 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

• Led design, architecture and development of the MVP and core platform from zero; recruited, mentored and coordinated the developers
• 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

• Started on RingRing, a platform selling content for the phones of the time — monophonic and polyphonic ringtones, color and monochrome wallpapers
• Moved to the interfaces team to build storefronts that sold content straight to users — WAP pages in WML for older phones, BREW navigation for limited devices, and web stores in C# and .NET
• Built content stores for Brazil’s largest carriers — Vivo, TIM and Claro — starting with TIM Music Store, TIM’s portal for selling content to its customers
• Each store served a regular web version and a mobile version, told apart by the user-agent values the carriers sent

C# · ASP.NET · Microsoft SQL Server · WAP/WML · BREW · SVN