Muhammad A.

Senior Mobile Engineer with 7+ years building and rescuing React Native and native Android (Kotlin/Java) apps that ship to the App Store and Google Play. I've shipped 10+ production apps, including the #1-ranked sports app in Saudi Arabia's Play Store (10,000+ downloads), an AWS IoT medical app where I cut video-streaming lag by ~60%, and apps for PepsiCo Pakistan and Karachi Traffic Police. WHAT I CAN DO FOR YOU • Build new React Native (Expo or bare) or Kotlin apps, from architecture to store release • Upgrade and rescue legacy React Native apps: version upgrades, Hermes/build failures, broken dependencies, Play Store target API compliance • Write native Android modules and bridge them into React Native • Real-time features: chat, live bidding, Socket IO / Pusher / WebSockets, video calling (WebRTC, Twilio), live audio/video streaming (HLS/DASH) • Payments: Stripe, Checkout, PayTabs, and local gateways (HBL, Easypaisa) • AWS (IoT Core, Cognito, DynamoDB, S3, Kinesis Video Streams), Firebase, push notifications (FCM, OneSignal), Bluetooth Low Energy • Performance optimization, CI/CD and App Store / Play Store publishing SELECTED WORK • Evolution Optiks (React Native + native Android, AWS IoT): lead developer for 4+ years; ~60% less WebRTC lag, 40% faster navigation, HIPAA/GDPR compliance • Sinjab (Kotlin): padel court booking app, #1 sports app in the Saudi Play Store; led Stripe-to-PayTabs migration • CMS Insurance (React Native): upgraded a legacy app, fixed a blocking Hermes build failure and migrated 60+ dependencies • HOT105FM (Expo): live radio app, published solo to both App Store and Play Store • BSK (Expo): subscription streaming app with on-demand and live TV, HLS/DASH and Stripe • Elaaj (Kotlin): telemedicine app with video consultations, lab tests, pharmacy orders and local payments • Motori (Kotlin): live car-auction app with real-time bidding, 50%+ faster updates HOW I WORK Clear written updates, async-friendly across time zones, clean MVVM / TypeScript code, and support through release and after launch. Send me your app idea, or the bug that's blocking your release, and I'll reply with a concrete plan.