Callback: Interview Prep
Interview prep for developers
Only for iPhone
Free · Designed for iPhone. Not verified for macOS.
iPhone
Eleven topics, timed mock interviews, and a review queue that remembers what you got wrong. No account, no network, no tracking.
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.
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
Callback makes no network requests at all. Your progress lives on your device and nowhere else. There is no analytics SDK, no advertising, and no crash reporting. You can export everything you've done as a JSON file, or erase it in one tap.
Get the callback.
Ratings & Reviews
- This app has not received enough ratings or reviews to display an overview.
The developer, Vladimir Babin, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Not Collected
The developer does not collect any data from this app.
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Provider
- Vladimir Babin
- Size
- 2.3 MB
- Category
- Education
- Compatibility
Requires iOS 18.0 or later.
- iPhone
Requires iOS 18.0 or later. - Mac
Requires macOS 15.0 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 2.0 or later.
- iPhone
- Languages
- English
- Age Rating
4+
- 4+
- Copyright
- © 2026 Vladimir Babin