app interview questions: 45 Mobile Apps Interview Questions (With Sample Answers)


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    As more and more businesses are moving their services to the cloud and creating mobile apps, it’s no surprise that many companies are looking to hire developers who can create great products. And while you might be a rock star at developing web applications or desktop software programs, your ability to build an app that works on a smartphone or tablet is what separates you from other candidates. So if you’re one of those would-be developers looking for ways to stand out in today’s job market, here’s a friendly guide on what it takes to land your first interview with a potential employer:

    What kind of mobile apps have you built?

    The interviewer will want to know what kind of apps you’ve built, and how they compare to the position you’re interviewing for. You should be able to talk about at least three different mobile apps that you contributed to building.

    • What do they do?
    • What was your role in building them?
    • How long did it take to build them?

    The interviewer will also want an idea of how big these projects were, so be sure to mention any teams that worked on each project with you (or even just one other person). If there were multiple people involved in creating an app, then explain who else was working on it with you and what their roles were–for example, “The team consisted of myself as well as three other developers.”

    Can you tell me about your experience with object-oriented programming in Swift?

    The interviewer is looking to see if you know what classes, protocols and structures are. They also want to make sure that you understand how to use them. Some of the questions they might ask you include:

    • Can you tell me about your experience with object-oriented programming in Swift?
    • Tell me about the difference between classes, protocols and structures in Swift?
    • What is an optional? And how would you use one?

    Do you have any experience building iOS applications with Core Data?

    • Core Data is an object graph management framework that allows you to work with data in your app. It’s a database on the device, so it can store and retrieve data for you as well as update it on the fly.
    • Core Data is useful for apps that need to store large amounts of information, such as a social media app or e-commerce app (and even games!).
    • You would use Core Data if you wanted to be able to add new objects without having to re-build all of them from scratch every time you make changes–you can just add new ones directly into the database instead! This saves lots of time because there’s no need for developers or designers who are working together on this project; everyone just adds their part individually and then builds off each other’s work later on down the line when needed.”

    What is your preferred development environment (or IDE) for building mobile applications?

    The preferred development environment (or IDE) for building mobile applications is a tool that developers use to write code. A wide variety of IDEs and other tools are available, including:

    • Xcode (for iOS apps)
    • Android Studio (for Android apps)
    • Visual Studio Code (for web and cloud development)

    How would you architect a distributed system?

    Distributed Systems

    A distributed system is a system that is made up of multiple computers that communicate with each other. Examples of distributed systems include the internet, mobile applications, and chat apps.

    The main challenges of designing a distributed system are:

    • Scalability – how to handle increasing load on the system as it grows in size or traffic?
    • Availability – can all users access the services when they need them?
    • Fault Tolerance – what happens if some nodes in the network go down or stop working correctly?

    Tell me about your experience with MVC architecture.

    MVC stands for Model-View-Controller. It’s a popular architecture that you’ll find in many applications, including mobile apps. In MVC, you separate the application into three parts:

    • Model–This contains all of your business logic and data storage.
    • View–This displays information to users through screens or other UI elements (such as buttons).
    • Controller–The controller handles input from users via views and updates models with new data when necessary.

    How would you test a mobile application without a real device?

    The first thing you need to do is decide whether you want to test the app on a real device or in an emulator. If there are any bugs that are specific to the hardware or operating system (OS), then it’s best if you can test it on a real device. However, most issues will occur at the software level and can be replicated using emulators.

    If you don’t have access to either of these options, then cloud services like Firebase Test Lab and Google Cloud Functions could help simulate some of their functionality remotely so that they appear as if they were installed locally on your computer or smartphone.

    What tool could I use to inspect my running app on an iOS device?

    You can use the inspector tool to inspect your running app on an iOS device. The inspector allows you to view information about elements in your application, such as views and controls.

    The debugger is also useful when working with apps on iOS devices. It allows you to pause execution at any point and step through code while watching its behavior; this makes debugging much easier than it would otherwise be if you were forced to guess where errors were occurring based only on their symptoms.

    What are some standard ways of doing front-end development for an Android application?

    • Use of the Android SDK
    • Use of Java and Kotlin
    • Use of the Android Studio IDE
    • Use of Gradle and Maven

    The mobile app development lifecycle is made up of many tasks, including front-end development. Front-end developers are those who create or manage the user interface, which includes designing and building interfaces for apps. They also work on back-end systems like databases, web servers, etc., that power an application’s functionality. If you’re looking for a job as an Android developer (or want to become one), it helps to understand some standard ways in which people do front-end development for Android applications:

    Mobile apps are a big part of the modern workforce, and employers want to know if you can build them well.

    Mobile apps are a big part of the modern workforce, and employers want to know if you can build them well. You should be able to answer these questions:

    • What is an MVP?
    • What does it mean for an app to be “scalable”?
    • How would you go about building a mobile app with no experience?

    We hope this list of mobile app interview questions has given you some insight into what employers are looking for in candidates. If you’re ready to put your skills to the test, check out our job board!

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