Full-stack Mobile & Web Developer 📍 Toronto, Canada

I build scalable, production-ready mobile and web applications with a strong focus on performance, developer experience, and real-world reliability. My background spans iOS, Android, backend services, and modern web tech.

Languages & Frameworks

• TypeScript / JavaScript
• Swift (iOS, watchOS, WKWebView)
• Python
• React / React Native
• Node.js

Mobile

• iOS (Swift, UIKit, SwiftUI)
• React Native (Expo)
• OTA update systems
• Push notifications (APNs, Android)

Backend & Infra

• Node.js services
• RabbitMQ (event-driven systems)
• REST & WebSocket APIs
• Docker & CI/CD pipelines
• Cloud deployments

A Node.js push notification service using RabbitMQ as a message broker. Designed for scalable, async delivery of iOS push notifications via APNs.

• TypeScript
• Message queues
• Service-oriented architecture

A WKWebView wrapper for a browser-based flight simulator experience.

• Swift
• iOS WebView integrations
• Native ↔ Web communication

A Python client library for interacting with an async notification service.

• Python
• Clean API design
• Client-side reliability

Merged into @callstack/react-native-paper (popular React Native UI library).

Fixed a visual bug where determinate ProgressBar fill border radius was scaled down at low progress values. Updated the animation approach to preserve rounded fill styles while maintaining native driver compatibility.

• Impact: Improved visual consistency for thousands of app developers
• Tech: TypeScript, React Native, Animation transforms
• View PR #4950

Merged into @vantuan88291/react-native-ota-hot-update (production OTA update system).

Fixed a critical crash on Samsung devices where SharedPreferences restoration after app reinstall caused startup failures. Implemented validation logic and graceful fallback to embedded bundle when stored paths are stale or missing.

• Impact: Prevents production crashes in backup/restore scenarios
• Problem solved: JSBigFileString::fromPath - Could not open file errors
• Tech: Android, Java, SharedPreferences, edge-case reliability
• View PR #131

• Merged contributions in established open-source projects
• Consistent commits across public and private repositories
• Focused on bug fixes, edge cases, and production stability
• Pull requests with real-world impact

• Performance matters — users notice delays
• Frontend is the API for humans
• Systems should fail gracefully
• Good DevOps saves teams time
• Clean architecture beats clever hacks

• 📧 Email: MichaelSebsbe@gmail.com
• 💼 GitHub: github.com/MichaelSebsbe

Thanks for stopping by 👀 Always happy to collaborate or talk architecture.