Karthika maglin S

Mobile Application Developer with 9+ years of experience building cross-platform Android & iOS apps using Xamarin and .NET MAUI. Proven in migrating legacy codebases, integrating Firebase cloud services, embedding Twilio VoIP and payment SDKs, and shipping production apps to the Play Store and App Store including apps used across the UAE.

Programmer Analyst at Thapovan Info Systems (2024-08 – Present)

• Architected two cross-platform apps in.NET MAUI with strict MVVM + dependency injection, cutting platform-specific code by ∼40% vs. the prior Xamarin.Forms baseline.
• Led migration of 3 legacy Xamarin apps to.NET MAUI re-engineered Renderer-based controls to MAUI Handlers, eliminated deprecated APIs, and improved cold-start time by 30%.
• Integrated Firebase Remote Config for runtime feature-flag toggling (no store release required) and Firebase Analytics with custom event schemas, driving a 20% lift in feature-adoption metrics.
• Implemented Twilio Voice SDK for in-app VoIP: built full call-state machine (ringing → connected → ended), DTMF handling, and background audio sessions on Android & iOS.
• Profiled memory retention with dotMemory, identified ViewModel event-handler leaks, and reduced app crash rate by 25%; maintained >85% unit-test coverage via xUnit + Moq.

Mobile Application Developer at Compass International LLC (2016-12 – 2024-08)

• Developed and maintained 4 production Xamarin apps (Android & iOS) for UAE market owned full SDLC from requirements through Play Store / App Store release and post-launch monitoring.
• Designed shared MVVM base classes and service layers (HTTP client, auth token refresh, caching) reused across all apps, reducing new-feature delivery time by ∼35%.
• Integrated payment gateway SDKs (ENOC Pay) with 3DS auth, tokenisation, and webhook-based transaction status zero card data stored on device (PCI-DSS aligned).
• Built Twilio VoIP features (Vumber) including virtual number provisioning via REST, call routing, and APNs/FCM push-to-call delivering incoming call latency under 2 seconds.
• Eliminated UI-thread jank by replacing bulk ObservableCollection updates with batched notifications and introducing LRU image caching, cutting scroll frame drops by ∼50% on mid-range devices.

B.Tech in Information Technology – RVS College of Engineering and Technology (2012 – 2016)