Abu B.

Top Rated Plus | 100% Job Success | 8+ Years on Upwork Android Engineer specializing in AI integration, WebRTC, BLE, and Android system apps — 8+ years, production-grade delivery. I build the Android features most developers avoid — real-time video calling, on-device AI, BLE hardware communication, and system-level apps that ship with the OS. Clients come to me when they have a specific hard problem, not when they need a generic app. 🟡 AI & On-Device ML Gemini API · OpenAI · ML-Kit · TFLite · OCR · Speech recognition · OpenCV. AI features that run offline — no API cost, no latency, no data leaving the device. I've shipped document intelligence apps, smart search, and AI chat features in production. 🔴 Real-Time Communication & VoIP WebRTC · Janus media server · FreeSwitch · SIP/PSTN · Audio/video calling · Live streaming. Built and shipped video conferencing platforms and VoIP apps — not side projects, production systems with real users. 🔵 IoT & BLE Bluetooth Low Energy · Wearables · Fitness bands · Smart sensors · NDK/C++. Delivered BLE fitness trackers that sync real-time data from hardware to app with zero packet loss. ⚙️ Android System Apps Custom dialers · SMS apps · Launchers · Telephony framework · Kiosk mode · Privileged APIs · Embedded Android devices. I've built apps that ship directly with the OS on Android-based feature phones — deep system access most developers don't have. Stack: Kotlin Java Android SDK · Jetpack Compose · Android Jetpack · MVVM/MVI · Clean Architecture · Hilt · Coroutines · Flow · Room · CameraX · Firebase · Kotlin Coroutines · RxJava · Retrofit · Firebase · AWS · Google Maps API · Stripe · React Native · Flutter · Room · Realm · Jenkins · Docker. Process: Written spec → architecture plan → iterative builds you can test → QA → release → maintenance. Realistic estimates. If scope changes, you hear from me first. If you need an Android Developer who ships production-grade apps and takes full technical ownership, let's talk.