Usman

Android & iOS Developer

EPOS • Tiempo completo

Sep 2024 - Present • 1 yr 8 mos

Working as a full-stack mobile developer at XEPOS, a UK-based restaurant and retail technology company, building and maintaining a suite of native iOS and Android applications used in live production environments. - Architected the Kitchen Display System (iOS) entirely from scratch using SwiftUI and Clean Architecture — zero existing codebase to start from - Built and maintained the full XEPOS app ecosystem: Kitchen App, HQ App, Waiter App, and Authenticator App across both iOS and Android - Implemented robust REST API integration using Moya (iOS) and Retrofit (Android) with full error handling and token-based authentication - Resolved critical crash issues and performance bottlenecks that were affecting live restaurant operations — improving app stability significantly - Redesigned UI/UX across multiple apps to ensure platform consistency and a polished user experience on both iOS and Android - Applied MVVM and Clean Architecture principles across all projects, ensuring every codebase is maintainable, testable, and scalable Tech: Swift · SwiftUI · Kotlin · Moya · Retrofit · MVVM · Clean Architecture · REST API · Xcode · Android Studio

iOS Developer

Lowe's • Tiempo completo

Apr 2025 - Sep 2025 • 5 mos

Worked as an iOS Developer at LowByteStudio, a software agency based in Rawalpindi, building multiple client-facing iOS applications with a strong focus on security, AI integration, and maintainable architecture. - Developed a secure Authenticator App for iOS featuring time-based OTP token generation, Face ID/Touch ID biometric authentication, and AES-encrypted Keychain storage — built to enterprise security standards - Built a fully functional AI Chatbot iOS app by integrating the OpenAI GPT API, featuring real-time message streaming, conversation history persistence, and a clean SwiftUI chat interface - Contributed to a Donation App, implementing core features, improving UI/UX flows, and enhancing overall user experience - Followed strict MVVM + Clean Architecture principles across all projects, ensuring code was readable, testable, and easy to hand off - Maintained high code quality through consistent use of protocols, dependency injection, and separation of concerns Tech: Swift · SwiftUI · OpenAI GPT API · MVVM · Clean Architecture · Keychain · CryptoKit · Face ID · CoreData

Android Developer

InterWork Office Solutions • Tiempo completo

Mar 2024 - Jul 2024 • 4 mos

Worked as an Android Developer at 03 Interlaces, a software development company based in Islamabad, focused on building a real-time GPS-powered fitness tracking application for Android. - Developed a full-featured Running Tracker Android app with live GPS tracking, real-time route drawing on Google Maps, step counting, pace calculation, and run history storage - Integrated Google Maps SDK for live location updates and dynamic route rendering during active runs - Applied MVVM architecture with Android Jetpack components — LiveData, ViewModel, Room Database, and Navigation — for a clean, reactive, and efficient codebase - Improved UI responsiveness significantly, ensuring smooth real-time data flow even during active GPS tracking sessions with no lag or jitter - Built run history persistence using Room Database, storing routes, distance, duration, pace, and calorie data per session - Used Kotlin Coroutines for async GPS and sensor data handling without blocking the main thread Tech: Kotlin · Android Jetpack · Google Maps SDK · MVVM · LiveData · ViewModel · Room DB · Coroutines · Retrofit