Hiring Mobile App Developers: 7 Essential Interview Questions

Remote developers might not be a bad idea if you are hiring an iOS developer as many tech talent communities can provide help to find your ideal candidate remotely. Discover insights on digital product development, user experience design, and tech engineering. By using dequeueReusableCell, we only create the cells needed to fill the screen and a little more. As the user scrolls, this method will dequeue the cells that are no longer on the screen and reuse them for new cells.

This is by no means an exhaustive list, but it can help you prepare for your upcoming technical iOS interview. Are you asking the right mobile app developer interview questions? In recruitment, the appropriate questions will typically determine the ultimate success of employee hiring. It’s important for mobile app testers to be familiar with how to test applications on different operating systems. A hiring manager may ask you this question to assess how familiar you are with apps specifically designed for Android devices. List each of the tests you’d typically perform to answer this question.

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Template is a design pattern where the main concept is to have a base class that outlines the algorithm of what needs to be done. The base class has several abstract methods that are required to be implemented by its concrete subclasses. Users of the Template Method classes only interact using the base class that implements the algorithm steps; concrete implementations of those steps are supplied by subclasses. Sometimes it might be asked to gauge experience you have with other languages and your broader understanding of what the language you use gives you and its advantages, disadvantages, and limitations. Testing applying the Android Testing framework with a device or an emulator is challenging.

This question is a great way to see how passionate you are about programming languages. It also shows the interviewer that you have experience with multiple languages and can adapt to new ones when necessary. When answering this question, it’s important to show your passion for the language you choose while also highlighting your ability to learn new languages. Services in Android are a special component that facilitates an application to run in the background in order to perform long-running operation tasks.

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It’s also available for hybrid solutions like Xamarin or React Native and is more efficient than SQLite. JUnit is a “Unit Testing” framework for Java Applications which is already included by default in android studio. Here we will be using only @Test annotation to keep the article easy to understand. Squeeze extra performance out of a device to achieve low latency or run computationally intensive applications, such as games or physics simulations.

The prime aim of a service is to ensure that the application remains active in the background so that the user can operate multiple applications at the same time. A user interface is not desirable for android services as it is designed to operate long-running processes without any user intervention.

What are the major difference between ListView and RecyclerView?

Behavioral interview questions require you to recall a time you displayed certain hard and soft skills. For these types of questions, discuss a specific situation, what you did in the situation, and the outcomes you achieved. Also known as user experience testing, usability testing is a common practice mobile app testers and developers use to determine whether an application meets the needs and desires of their target audience. Provide a brief overview of how you can conduct this test and share what type of information you can gather from it. Other applications will use a provider client object, creating an interface to handle communication. As a programming question, be ready to explain how you would access data from a content provider in addition to supplying information on creating a content provider within your own app.

Describe a time when you made a suggestion to improve something on the project that you were working on. Hire BrainStation Graduates Tap into our network of skilled graduates, get access to our hiring events, and more.Impact Scholarships Become a sponsor and contribute to diversity and accessibility in tech. BrainStation helps companies prepare for the future of work through cutting-edge digital skills training, top talent recruitment, and more. Simple function calls are used by the library that reduces database access latency. The portable wi-fi hotspot is used to share internet connection to other wireless devices.

Q15. What is meant by QOS in app development?

To help you prepare for the range of questions that may come up in your interview, we have put together a list of commonly asked iOS Developer interview questions. One of the most significant issues that bother Android users is an unresponsive app with the ANR or application not responding to messages. When the app is mostly using the main thread, these problems occur. This problem can be avoided by performing networking operations or lengthy databases on separate threads. This is a top-grade question to start with and check whether the developer knows the basics of developing the app from scratch.

  • Inheritance is defined as a process by which a child class inherits the properties of the parent class.
  • Even as you explain why your methods might have been ultimately proven right, be humble, and show how you ultimately gathered buy-in from the other team members.
  • This question can help the interviewer get a sense of your knowledge and experience in the field.
  • Pair programming is not for everyone and could be an exhausting process if people’s personalities do not match.
  • With this question, your interviewer is assessing your knowledge of different messaging patterns used in iOS.
  • This virtual machine is very efficient in running multiple instances on the same device.

An Intent is an object passed to Context.startActivity(), Context.startService() or Activity.startActivityForResult() etc. to launch an activity or get an existing activity to do something new. On the other hand, an Intent filter describes the capability of the component. Stubs are fakes that do some meaningful work that’s necessary for the objects involved in a test to operate, but not used for anything more than that. https://remotemode.net/ They can’t be used in place of real production objects but can return stubbed values. Nimble is a matcher library that can be used with XCTest or Quick to assert expectations in your tests/specs. In regards to unit testing, there are several options as well, but the two most popular ones are XCTest and Quick and Nimble. The basics that every iOS developer should know about async work are GCD and NSOperations.

Background- The application is running in the background and can still execute codes. When you minimize the app, it transitions to this state briefly, usually about 5 seconds, before transitioning to the suspended state. Cons- Since it can be accessed everywhere, it can easily be abused by the developers and it might be hard to trace where the data are being manipulated if it is being modified in too many places. Method overloading is the process by which a class has two or more methods with the same name but different parameters. Abstraction is an OOP concept by which we expose relevant data and methods of an object while hiding their internal implementation. Technical skills and expertise are necessary for all iOS Developers, but employers are also looking for the right personality and attitude.

mobile developer interview questions answers

The developer might provide an offline mode and different data loading behavior when working on WiFi, LTE, 3G or H; e.g., do not download movies or request how to become a mobile developer lower-quality images. Localization (“l10n”), on the other hand, is the process of preparing the content of the app to be available in different languages.

Share your best soft skills, why they’ve been valuable in your past development projects, and the value they bring to this project. At the end of the day, you need a development team that’s as invested as you are in the success of your app. By creating an account I have read and agree to InterviewBit’s Termsand Privacy Policy. By creating an account, I acknowledge that I have read and agree to InterviewBit’s Terms and Privacy Policy .

What is backend in software?

The back end refers to parts of a computer application or a program's code that allow it to operate and that cannot be accessed by a user. Most data and operating syntax are stored and accessed in the back end of a computer system.

RxSwift and Promises are advanced concepts, but senior developers should know them. In-memory arrays, dictionaries, sets, and other data structures are perfectly fine for storing data intermediately or if it doesn’t have to be persisted. The Dependency Inversion Principle states, “depend on abstractions, not concretions.” The best example that showcases this principle is the Dependency Injection technique. Another malicious side effect of “convenient” singletons is the global state. Often singletons enable global state sharing and play the role of a “public bag” that every object uses to store state. That leads to unpredictable results and bugs or crashes when this uncontrolled state gets overridden or removed by someone.

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