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      Senior IOS Developer Interview

      May 1, 2025
      Anonymous Interview Candidate
      No offer
      Positive experience
      Average interview

      Application

      I interviewed at Persistent Systems

      Interview

      How does the iOS app lifecycle work? What are the key differences between MVC and MVVM? Explain the delegation design pattern and provide an example. What is the difference between synchronous and asynchronous operations in GCD? What are escaping and non-escaping closures in Swift?

      Interview questions [1]

      Question 1

      What is the difference between struct and class in Swift? What are optionals in Swift and how do you unwrap them? What is ARC (Automatic Reference Counting)? What is the use of guard and how is it different from if let? What is the difference between frame, bounds, and center in UIView?
      Answer question

      Other Senior IOS Developer Interview Reviews for Persistent Systems

      Senior IOS Developer Interview

      Sep 10, 2025
      Anonymous Interview Candidate
      Sunnyvale, CA
      No offer
      Positive experience
      Average interview

      Application

      I applied online. The process took 1 day. I interviewed at Persistent Systems (Sunnyvale, CA) in Aug 2025

      Interview

      I was attempted only one round. I am not selected. We need to share screen and do the coding test. Going to ask more about the answers we provided. I was attempted only one round. I am not selected. We need to share screen and do the coding test. Going to ask more about the answers we provided.

      Interview questions [1]

      Question 1

      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]]
      Answer question