Essential React Native Interview Questions

1. What is React Native and how does it differ from React JC?

Yes, this is a basic knowledge question, but it’ll allow you to understand whether the candidate is well versed in the topic.

React and React Native are open source projects created by Facebook, but they are not the same thing and a potential developer should know this. In a nutshell, React JS is a JavaScript library, while React Native is a self-contained framework with multiple features that can be used to build your apps from start to finish.

The differences between React Native and React.js are binding, customization, DOM, gesture publishing, styling, animation, framework custom code, and navigation. In React Native, you won't be using HTML compared to React.js. Another difference between them is styling, because in React Native this element is different from React.js. Moreover, creating animations is more efficient using React Native than React.js. The same function applies to gestures. If you want to create an app with better navigation, the developer would better use React Native, not React.js. So if you want to quickly build a mobile app, React Native is the right solution for you.

2. What are the main benefits of using React Native?

A big plus for a candidate will be their ability to tell why it is worth using React Native and what advantages it has.

The React Native framework has several benefits that set it apart from other libraries. The main ones are the following:

The creation of a software product is carried out based on the familiar React, but with minor changes. They consist in displaying software, the appearance of which is developed for a separate platform.
High speed of product development. This result is achieved due to the ability to adapt and integrate modules.
A result of short lead times is the low cost of software development.
Intermediate libraries are used to activate software products. Thanks to this, the programmer does not need to enter development separately for all operating systems.
In case of changes in components, the product is automatically updated for all mobile platforms.
Large selection of templates, which saves time on creating the user interface.
Shorter lead time for application prototypes.
Ease of use and perspective of the framework.

3. Have you ever run into app performance problems?

Performance is one of the most anticipated issues in React Native. While this rarely happens in practice, you’ll most likely want to know how your candidate can handle their application performance issues. Common problems are often the result of over-rendering and can be easily resolved. Developers may note blending and offscreen rendering – and this is a good indication clear that they are running into some really tough problems (animation maybe).

4. What libraries do you use with React Native?

React Native has a large and active community that is constantly adding and developing libraries. However, like any young framework, React Native has its drawbacks. Since all libraries are created at different times, they may cause bags if used simultaneously. Sometimes libraries are incompatible with each other, or the latest library version turns out to be experimental. In order to properly navigate all of these libraries, a large React Native experience is desirable.

5. Do you apply quality assurance?

Every project – regardless of its size – needs to be tested. Using React Native when the codebase is being developed for several platforms at the same time is the case when quality assurance is necessary.

While code reuse makes things easier, you can't go without quality assurance. An experienced React Native contractor knows where problems can arise and how to fix them before they cause an application error. A lot of bugs can only be found during the runtime, so different types of testing should be applied at all stages of development.

6. What is your work experience?

Years of practicing is not necessarily a reliable measure of experience. However, it would be strange not to attach any importance to this at all. Web development agencies often go out of business after a year of work. What is the reason for this? Perhaps an unprofessional approach to work. If the company was able to hold out longer, this is a good sign – this team really knows how to satisfy their customers!

7. Do you have React Native projects in your portfolio?

A developer can have a very impressive portfolio filled with a variety of projects, but only a few of them will be based on React Native. In this case, it will be difficult for you to evaluate their professionalism and the quality of services that they can provide. Cooperate with developers that focus on cross-platform mobile development and can provide at least 5-7 projects using React Native. The more the better!

Studying the developers’ projects, you can understand in what areas, with what tools and technologies they worked. Cases help evaluate the results of the work done and how well the team achieved the customer's business goals. If the team has managed to work with large brands, this is also a good indicator. International companies have very strict requirements for their contractors. If the developers managed to comply with them, they are quite experienced and you can entrust them with your software task.

We hope this article helps you make the right choice when choosing a React Native contractor.

If you’re looking for a reliable developer, you can get in touch with Yojji team. Our qualified specialists have extensive experience in developing projects in React Native and are ready to help you with any of your projects.