Top Flutter Interview Questions

Haris Bin Nasir Avatar



The majority of people dread job interviews. As a result, proper preparation before an interview is critical. As a result, in this article, we’ll go over the most often asked Flutter Interview questions.

Most importantly, this will increase your self-assurance during the job interview.

Here are 15 of the most common Flutter interview questions

15 Flutter Interview Questions

1. What is Flutter?

Google’s Flutter is an open-source user interface software development kit. It is used to create cross-platform applications from a single codebase for Android, iOS, Linux, Mac, Windows, Google Fuchsia, and the web.

Flutter is being used by many companies around the world to create apps. This is owing to its ability to create native apps across a wide range of areas. As a result, the most popular flutter-based apps are:

  • Firstly, Google Ads for utility bills.
  • Secondly, Reflectly on lifestyle.
  • Alibaba for commerce
  • Birch Finance
  • Coach Yourself
  • Tencent
  • Watermaniac
  • Cryptograph
  • SG Bus tracker

These apps and many more have utilised Flutter to create stunning cross-platform apps.

3. How would you advise a novice programmer who wants to start building mobile apps using flutter?

  • One thing to keep in mind is that Flutter is dependent on iOS and Android projects. As a result, it is critical that the new developer is conversant with the Android and iOS project structures. To develop any native code with flutter, one must have prior knowledge with one or both platforms.
  • Generally, coding in Flutter is simple and enjoyable. As a result, when compared to Android iOS for the same pages, it has fewer codes. As a result, developing apps will be simple and without much difficulties.

4. Name the best editors for flutter development?

Flutter IDE and tools are designed to speed up flutter development, improve the development workflow. Above all, the flutter IDE and tools are excellent for creating mobile applications. As a result, several plugins will be required. Plugins typically aid in Dart compilation, code analysis, and flutter development.

As a result, Android Studio and Visual Studio Code are the ideal editors for flutter development.

5. What are flutter widgets?

A tree of widgets is stated to exist in a flutter app. Developers typically construct the entire user interface by combining smaller widgets to create sophisticated widgets, pages, and a hierarchy of pages.

In object-oriented programming, this is referred to as the composition over inheritance concept.

In flutter, there are two sorts of widgets that can be used as a starting point.

  • Stateless widgets

Widgets with no state are known as Stateless Widgets and they can only be drawn once. As a result, once the widget is loaded, it cannot be redrawn in response to events or user actions. Regardless, stateless widgets are still useful. Furthermore, they aid in the display of static content that necessitates multiple reloadings within an app.

  • Stateful widgets

This form of widget keeps track of any state changes that occur during the widget’s lifespan. Above all, setState() should be used to change a Stateful Widget‘s state. As a result, the widget is disabled.

6. Is Flutter limited to the mobile world only?

No, Flutter isn’t just for mobile devices. Developers can use it to construct Desktop as well as Web Apps.

7. What are the advantages of flutter?

There are a number of advantages of using Flutter. As a result, I recommend that you use Flutter in your next project to truly realize the benefits.

Below are some of the benefits of Flutter.

  • Shorter code development time.
  • Furthermore, flutter also supports cross-platform development.
  • Lastly, its potential ability to go beyond mobile, makes it useful in other capacities.
  • It has a flexible and expressive UI.
  • The capability to customize an animated UI of any complexity.
  • It provides the same UI and business logic in all work platforms. Currently, no application framework that supports the sharing of both UI code and UI itself except Flutter.
  • Additionally, flutter has its own rendering engine.

8. Between flutter and React Native which one is better?

This is a straightforward but challenging Flutter Interview Question. Flutter and React Native, for starters, are used to create hybrid native apps for iOS and Android from a single codebase.

Since its introduction on March 26, 2015, React Native has been on the market for a while. Flutter was released in May of 2017.

As a result, picking the best of the two is tough because they both offer excellent features.

Hence, it is up to the developer to choose which one to employ while working on a project.

9. From a business perspective, would say Flutter is a good solution?

Yes, it is a viable commercial solution. There are various elements that have a significant impact on the value of a company. For instance, platform performance and stability, a large talent pool, and room for growth.

As a result, any issues with the platform relating to the aforementioned aspects trigger the emergence of risks, resulting in a financial loss to the company, whether indirect or direct.

Flutter is a good development framework for a business for the following reasons:

  • Ease of finding engineers who can professionally use Flutter.
  • Because of Fuchsia OS created by Google, product development problems are reduced while using flutter.
  • Ease of integration since there are several companies using Flutter.

10. Briefly, explain the steps of writing a flutter app?

It’s easy to make a Flutter app. The programmer must understand basic programming and object-oriented coding.

The following are the steps to follow while writing a flutter app;

  • Creating the starter flutter app– the developer should create a simple templated flutter app.
  • Apply an external package– in this category, the developer should start using an open-source package known as english_words. This package has some utility functions and thousands of English words.
  • Addition of a stateful widget– This step is important, because, it helps in maintaining state that might change during the lifetime of the widget.
  • Creation of an infinite scrolling ListView– This stage involves the expansion of RandomWordState which helps in generating and displaying a list of word pairings.
  • Lastly, profile runs– After finishing, it is important to analyze the performance of the created app.

11. Why does the first Flutter app build take so long?

A device-specific APK or IPA file is created the first time a flutter app is developed. As a result, the files are built using XCode and Gradle, which takes time. Flutter then patches the changes to the existing app when the app is relaunched, resulting in a super-fast refresh.

12. How do you handle indentation and structure in Flutter code?

First of all, it is important to note that Android Studio has tools that make structuring flutter code simple.

Hence, the two main aspects are

Alt + Enter/ Command + Enter

Developers can wrap, swap, and delete widgets in a complicated hierarchy using this method. To access more choices, move your cursor to the widget declaration and click on the keys.


DartFMT is useful since it formats your code to guarantee that it has a clear hierarchy and identity.

Furthermore, by simply toying with a few brackets, it makes your coding easier to deal with.

13. Why are functions passed to widgets?

Functions are normally passed to the widget if they respond with “invoke this function when something happens.” Functions are first-class objects in Dart, and they can be used as parameters in other functions.

Finally, interfaces that use Callbacks have much boilerplate code for a normal callback.

  onPressed: () {
    // Do something here

14. Is drag-and-drop easier than making a layout in code?

This is a difficult Flutter Interview Question to answer. To a degree, this is correct. The vast majority of Flutter developers will select for coding alternatives. Similarly, this does not rule out the possibility of the flutter community implementing drag-and-drop.

Above all, if drag-and-drop is your preferred method of layout creation, the Flutter Studio is a useful tool.

15. Why are there Android and iOS folders in the Flutter project?

The Flutter project currently has three primary folders: android, lib, and ios. The ‘lib’ is crucial because it manages Dart files.

While the Android and iOS folders assist in the development of apps for those platforms using Dart files. They also assist in the addition of permissions and platform-specific features to projects.

When you execute a Flutter project, it builds using Gradle or XCode and the files inside it, depending on the emulator or device you’re using. As a result, the folders are full-fledged apps that prepare the ground for the Flutter code to execute.


I hope you found these questions to be really useful in your Flutter interview preparations. But don’t forget to double-check on other common interview questions. Expect to get both technical Flutter questions and general interview questions in the your interview. Please feel free to like and comment.

Happy Coding 🙂

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