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Sr Ios Developer Interview Questions

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1,465 sr ios developer interview questions shared by candidates

- General behavioural questions on first step, read yellow book. - System design: design a chat application. Two screens, contacts and message list. Most focus on second screen and on high level diagram of that. - Live coding: Refactor an old UIKit app. There was a collectionview inside a massive view controller with a list of something, fetched form api. Task was to refactor it to any kind of applicable architecture for testing. After that write tests for your chosen arch. And after small leetcode task with arranging integer elements inside an array.
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Senior IOS Developer

Interviewed at Glovo

3.4★
Jul 17, 2025

- General behavioural questions on first step, read yellow book. - System design: design a chat application. Two screens, contacts and message list. Most focus on second screen and on high level diagram of that. - Live coding: Refactor an old UIKit app. There was a collectionview inside a massive view controller with a list of something, fetched form api. Task was to refactor it to any kind of applicable architecture for testing. After that write tests for your chosen arch. And after small leetcode task with arranging integer elements inside an array.

1.How do we tell to Junior developer about class, struct usage 2.How do we tell to Junior developer about functions,, closures usage 3.Write syntax for functions and closures 4.About project and challenges 5.Which architecture is best to use 6.Diff between Obj-C and Swift UI 7.Why is accessibility important? 8.In Swift UI, do modifiers have prioritization? 9.Explain Swift Concurrency? 10.Write Generics to add two numbers? 10.*Coding test: Find Common Element in Rows Given a matrix where every row is sorted in increasing order, return the smallest common element in all rows. If there is no common element return -1. Input: mat = [[1,2,3,4,5,8], [2,4,5,8,10], [3,5,7,8,9,11], [1,3,5,7,8,9]]
avatar

Senior IOS Developer

Interviewed at Persistent Systems

4.2★
Sep 10, 2025

1.How do we tell to Junior developer about class, struct usage 2.How do we tell to Junior developer about functions,, closures usage 3.Write syntax for functions and closures 4.About project and challenges 5.Which architecture is best to use 6.Diff between Obj-C and Swift UI 7.Why is accessibility important? 8.In Swift UI, do modifiers have prioritization? 9.Explain Swift Concurrency? 10.Write Generics to add two numbers? 10.*Coding test: Find Common Element in Rows Given a matrix where every row is sorted in increasing order, return the smallest common element in all rows. If there is no common element return -1. Input: mat = [[1,2,3,4,5,8], [2,4,5,8,10], [3,5,7,8,9,11], [1,3,5,7,8,9]]

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