Junior Ios Engineer Interview Questions

7,864 junior ios engineer interview questions shared by candidates

The iOS coding challenge (implement in SwiftUI or UIKit): Create a grid that has over 100 tiles in one screen (No need scrollable) 1. The grid should be arranged so it has 6 columns. 2. The tiles should be square. 3. Randomly select a background color for each tile choosing either white or blue. When tapping ONLY on WHITE tiles, they should turn blue, and at the same time update the background color of every surrounding WHITE tile to blue (ABOVE, BELOW, RIGHT, and LEFT directions ONLY). For every white tile that turns to blue we will continue to update the background of the nearby white cells and so on until there are no cells to update. Making this an updating effect that begins with just one tap.
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Senior IOS Engineer

Interviewed at Tubi

3.9
Dec 11, 2025

The iOS coding challenge (implement in SwiftUI or UIKit): Create a grid that has over 100 tiles in one screen (No need scrollable) 1. The grid should be arranged so it has 6 columns. 2. The tiles should be square. 3. Randomly select a background color for each tile choosing either white or blue. When tapping ONLY on WHITE tiles, they should turn blue, and at the same time update the background color of every surrounding WHITE tile to blue (ABOVE, BELOW, RIGHT, and LEFT directions ONLY). For every white tile that turns to blue we will continue to update the background of the nearby white cells and so on until there are no cells to update. Making this an updating effect that begins with just one tap.

Task 1: Debug SwiftUI task management app with UI bugs, memory leaks, and potential crashes while maintaining all functionality Task 2: Fix concurrency implementation using callbacks, Combine, and Swift Concurrency to fetch reminders in parallel Task 3: Find and fix single bug in login screen to progress to next challenge
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IOS Engineer

Interviewed at Speechify

4.4
Dec 22, 2025

Task 1: Debug SwiftUI task management app with UI bugs, memory leaks, and potential crashes while maintaining all functionality Task 2: Fix concurrency implementation using callbacks, Combine, and Swift Concurrency to fetch reminders in parallel Task 3: Find and fix single bug in login screen to progress to next challenge

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