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Junior Ios Engineer Interview Questions

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7,870 junior ios engineer interview questions shared by candidates

During technical interview I was asked about Swift & iOS: generics, generic protocols, how Swift Optionals work, difference between closures and functions, how memory is allocated for closures, capturing values in closures, difference between structs and classes, how memory is allocated for structs and classes + edge cases (struct in heap, class in stack). After that showed me different code samples and tasks: DispatchQueue spaghetti task (to determine execution order), execution order, Unit-Testing sample task (to improve code and make a proper test), retain cycle task (to find this cycle or prove that there's no problems)
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IOS Engineer

Interviewed at Bolt

3.4★
Jul 26, 2023

During technical interview I was asked about Swift & iOS: generics, generic protocols, how Swift Optionals work, difference between closures and functions, how memory is allocated for closures, capturing values in closures, difference between structs and classes, how memory is allocated for structs and classes + edge cases (struct in heap, class in stack). After that showed me different code samples and tasks: DispatchQueue spaghetti task (to determine execution order), execution order, Unit-Testing sample task (to improve code and make a proper test), retain cycle task (to find this cycle or prove that there's no problems)

During Live Coding I had a small app to write, the purpose of this app was to parse local json file with geo points and put these points on the MapKit map. Solution should be clear, testable, scalable and support later migration from local file to remote data source. Things to think about: architecture and error handling.
avatar

IOS Engineer

Interviewed at Bolt

3.4★
Jul 26, 2023

During Live Coding I had a small app to write, the purpose of this app was to parse local json file with geo points and put these points on the MapKit map. Solution should be clear, testable, scalable and support later migration from local file to remote data source. Things to think about: architecture and error handling.

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