Prepare for mobile Interview vs Callback

Prepare for your next iOS interview with a focused question bank covering Swift, UIKit, SwiftUI, concurrency, architecture, and system design. Practice in short sessions, track progress, and keep core concepts fresh before your next onsite or screening.​ What you will learn Core Swift: value/reference types, ARC, generics, protocols, error handling and more.​ iOS frameworks: UIKit, SwiftUI, Auto Layout, navigation, data persistence and networking.​ Concurrency: GCD, OperationQueue, async/await patterns and common pitfalls.​ Architecture: MVC, MVVM, Clean Architecture, dependency injection and testability.​ Key features Structured question sets​ Topic‑based practice to focus on your weak areas before interviews.​ Quick review mode for last‑minute prep before a call or onsite.​ Offline access so you can study anywhere, anytime.​ Whether you are preparing for your first iOS role or refreshing your knowledge before a senior position interview, this app helps you practice consistently and walk into interviews with confidence

Callback prepares you for iOS developer interviews — on the train, in a waiting room, or the night before the real thing. Everything works offline. There is no account to create, nothing to sign in to, and no network connection required — only anonymous screen-view analytics on our own server. WHAT YOU GET • Eleven topics — Swift, Memory Management, Concurrency, SwiftUI, UIKit, Networking, Persistence & Data, Behavioral, Testing, Architecture & Patterns, and Mobile System Design — each with focused lessons and a bank of interview-grade questions. • Short, readable lessons with syntax-highlighted Swift, each ending in a quick check so you find out immediately whether it stuck. • Timed mock interviews with a pause-safe timer that survives backgrounding, so a phone call doesn't cost you the session. • A review queue that automatically resurfaces every question you got wrong or flagged — the fastest way to turn weak spots into strong ones. • Behavioral questions come with a model-answer rubric you score yourself against, because that's how they're actually assessed. • A readiness score that weights recent answers more heavily than old ones and accounts for how much of each topic you've actually covered. • Full VoiceOver support, Dynamic Type throughout, and Reduce Motion respected. PRIVATE BY DESIGN Your progress lives on your device and nowhere else. There is no advertising, no crash reporting, and no third-party SDK. The only thing the app sends is anonymous screen-view analytics (which screen you opened, app/OS version, device model — no identifiers) to our own self-hosted Umami server. You can export everything you've done as a JSON file, or erase it in one tap. Get the callback.