Hussein K.Private profile: Upwork shows its earnings only to signed-in members, so we check it every few weeks, not daily. MRR here is a rough estimate (Upwork's six-month earnings ÷ months active). Last read Oct 28, 2026.

Proficient in: – Swift, Objective-C, Java (Android), Kotlin, Ruby on Rails, ActionScript – SwiftUI, Combine – RxSwift / RxCocoa (MVVM), Clean Architecture, FRP – Git, Github, Bitbucket, GitLab – CocoaPods, Carthage, Swift Package Manager – Fastlane, SwiftLint – CoreData, Realm, SQLite, PostgreSQL – BaaS: Firebase, Nexmo, Twilio – API integration: Google, Facebook, Twitter, Instagram, Linkedin – Map integration: Apple Map / Google Map / Baidu Map – OpenCV, Document Scan – In-App Purchases, Stripe – TestFlight for build sharing – Build from scratch with the design by Sketch / Adobe XD / Adobe Photoshop – Network Security, Administration