Mobile Application Developer Interview Questions & Answers
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Mobile Application Developer Frequently Asked Questions in various Mobile Application Developer job interviews by interviewer. The set of questions are here to ensures that you offer a perfect answer posed to you. So get preparation for your new job interview

35 Mobile Application Developer Questions and Answers:

Mobile Application Developer Interview Questions Table of Contents:

Mobile Application Developer Job Interview Questions and Answers
Mobile Application Developer Job Interview Questions and Answers

1 :: Explain me what kind of smartphone do you use?

This is a no brainer! You’re going to be developing apps for mobile so your smartphone is one of your main tools. I bet you’re not going to have any problem answering this but it will be good that you demonstrate familiarity and knowledge on how to use more than one OS and brand.

2 :: Explain me do you have any project in development at the moment?

Show interest on what they are doing, discuss some details and make some relevant suggestions about their projects.

3 :: Tell me do you do code reviews?

One of the fastest ways to grow as a developer is to have other people read and comment on your code. Frequent code reviews mean the team is committed to getting better.

4 :: Explain me how do you handle security issues?

Security is always a very delicate subject especially when talking about mobile devices. Show your knowledge about security and expose your ideas about how to minimize security issues in the app they are creating. Get informed, was there a recent attack to a specific type of software? Mention it and be prepared to explain how you would have solved it.

5 :: Do you know how to help me make money off my app?

It could take awhile before your mobile app is earning money (after all, have you seen all the free apps on the App store?). It’ll take time for your app to be recognized and widely used by your target audience. Once that happens, you’ll have the authority to charge a small fee for your app.

A mobile app developer should have some understanding of how to monetize a mobile app. There are several ways: in-app advertising, subscriptions, pay per download.

If your app will be free for the first little while, then your developer should have an understanding of mobile advertising networks.

6 :: Can you please explain me about some of the disadvantages of both Android and iOS?

If you are developing an app for an specific platform, you are expected to know which are the disadvantages of that platform. Here you can mention the technical issues you have found when developing for each platform, and also the ways to solve those problems. It’s important that you’re specific and provide examples.

7 :: Tell us what size companies have you worked with in the past?

If you’re a large enterprise, you might feel more comfort knowing the mobile app developer you want to hire has similar experience.

The same goes for a startup business launching a mobile app. Businesses of different sizes operate very differently. The work atmosphere and culture could be very different from what the mobile app developer is used to, and therefore might not be the best fit.

If the developer has a keen understanding of processes, how paperwork and procedure is managed and budgets, then he or she may be a valuable asset to your team.

8 :: Explain me do you have any experience migrating an app from one platform to another?

Most apps must be available on more than one OS, so experience reconfiguring or migrating an app from one platform to another is a very valuable treat. Tell about your experience in this field and detail the apps you have reconfigured and the solutions you have found to do it. If you don’t have any experience, expose the reasons why you think you are technically prepared to do it.

9 :: Please explain how can designers leverage audio to enhance user experience?

Big players like Google and Apple are already using this approach to provide better UX while using their mobile platforms. Apple has Siri, while Google has Google Now. In order to enhance UX at some point, we can use voice for certain actions.

Cars can teach us a couple of basic things about designing with audio input for better user experiences. The first is that user experience design should not be limited to the usual graphic user interface (GUI).

For example, automotive apps could use voice to enhance user experience while the user is focusing on driving. Various car manufacturers have been integrating voice controls in their automotive infotainment systems for years.

Let’s imagine you are building an app that will alert the driver when the vehicle is approaching a speed camera or a built-up area. All it will take for the driver to take notice and adjust their speed is a simple audio alarm. The car has no means to visually inform drivers that they are about to hit the curb, which is why audio warnings are used for lane departure solutions as well, and similar audio warning systems have been employed in aviation for decades.

Sound tends to be very useful when we go beyond the GUI, especially when it’s necessary to alarm users and prompt them to act as soon as possible. This could be one of the examples how audio can enhance the user experience well beyond the screen.

10 :: Tell me how will you handle app testing?

More important than the actual development of an app is the testing itself. You don’t want to launch an app that hasn’t been thoroughly tested. Bugs and problems with features can happen, but should only happen during the testing period.

A mobile app developer should handle all of the testing and employ methodologies that tracks all features, establishes that they have all been implemented, and are in working order. Testing should be conducted during and after mobile app development.

It’s important to seek outside help in mobile app testing. You and a mobile app developer will have been working on the same project for a while, therefore may be unable to identify flaws or drawbacks. Consider seeking an outsider’s point of view.

11 :: Explain me do you have experience in building the features I’m looking for?

Before you begin interviewing potential candidates, create a wish list of which features your app must have, and which are nice to have. A list gives your potential mobile app developer an exact idea of what you’re looking for.

Once you have that list, ask the developer what functionalities and features they have experience developing. If your app requires very specific integrations that need to be included, then you’ll need to work with a developer with experience.

An experienced developer may still be capable of learning the functionality building you need; speak with them one-on-one to learn more.

12 :: Please explain me what is the best way to improve User Experience (UX) without changing the interface?

Animation has long been used as an eye-catching element that helps differentiate an app from its competitors.

Now, however, more designers are incorporating animation as a functional element that enhances the user experience, to simulate the appearance of interacting with a real object.

Animation is no longer just for games. It also illuminates navigation: Think of a button that toggles a panel of otherwise hidden content, such as a menu. Closing the panel shrinks the menu, where it disappears back into the button. Other examples include zooming content or providing feedback to confirm a user’s action.

Functional animation makes app experiences more dynamic and provides a more direct visualization of the user’s actions. As smartphones become more advanced, designers are adding HTML5 animation and parallax design to mobile apps to bring a new level of richness and excitement to the mobile user experience.

13 :: Tell us how could AR and VR change the future of mobile design?

Pokemon Go changed the rules of the game and created a new trend in mobile design and gaming. The combination of Augmented Reality (AR) and flexibility provided by smartphone platforms helped create a whole new user experience. These emerging technologies will bring monumental changes to digital product design.

The gaps between smart devices (smartphones, tablets, laptops, wearables) are being blurred with each consecutive product generation. Rapidly evolving hardware is bringing AR closer to mainstream users, even though the concept has been around for a while. There are many reasons why the interface will evolve. Designers are no longer limited by technology, their biggest limitation today is their own creativity. It is also important that many of these emerging technologies are reasonably priced, or seamlessly integrated in new devices at no extra cost to the user.

The design process in the future will change. For example, in order to make an interface for VR we need specialist skills, and we need to create UIs in 3D. In addition to designing 3D assets, designers will also have to master certain skills, for example learn some Unity basics, or employ 3D design software.

14 :: Explain me what is the best search pattern for mobile phones?

Displaying faceted-search controls on mobile devices in a ‘tray’ overlay is a new and effective way of displaying both results and filters on relatively small mobile screens.

Faceted search lets users refine a set of results by applying filters that comprehensively describe the search space. The ability to narrow down searches is invaluable for users who need to find something specific within a large content set. This type of search has become common for e-commerce/m-commerce and travel websites, as well as many different types of document and media collections.

A faceted system includes two critical elements:

Simple controls to construct sophisticated searches - providing familiar controls like drop-down menus and checkboxes with natural-language labels. This allows ordinary users to narrow down a large set of results to a smaller set that meets their exact criteria, without any knowledge of Boolean logic or query syntax.

Simultaneous display of the facet controls and the results - Showing both the filters and the results at the same time makes it easier for users to understand the relationship between the two; ideally, this is reinforced by dynamically updating the results set as soon as the user selects filter criteria.

15 :: Tell us how do you decide when to use infinite scroll or pagination?

When users depend on scrolling as their prime method of exploring data, it may compel the user to spend more time on your web page, thus increasing engagement. With the popularity of social media, massive amounts of data are being consumed; infinite scrolling offers an efficient way to browse that ocean of information without having to wait for pages to preload.

Users tend to have better experiences with scrolling than clicking/tapping. Gesture controls on mobile devices have made scrolling intuitive and easy to use. As a result, the users enjoy a truly responsive experience, regardless of what type of device they’re using. The biggest challenge is to maintain good performance in an application or website with infinite scrolling. If we see that the app will use too many resources because of size and volume of images or other types of content, then we need to make sure we try out an alternative approach.

Pagination is a user interface pattern that divides content into separate pages.

Pagination is good when the user is searching for something specific within listed content, not just scanning and consuming the flow of information. Furthermore, the user gets a sense of control. Infinite scrolling is like an endless game, while pagination allows us to visually sort different items. This means that if the user was searching for something on a website then he will quite easily find the necessary information on a paginated interface. Pagination is good for e-commerce sites and apps. When users shop online, they want to be able to come back to the place they left off and continue their shopping.

So basically, both approaches have their pros and cons. Which one should we choose?

There are only a few instances where infinite scrolling is effective. It’s best suited for sites and apps that boast lots of user-generated content (Twitter, Facebook) or visual content (Pinterest, Instagram).

16 :: Explain me what is onboarding and why is it so important for mobile design?

User onboarding is the process of increasing the likelihood that new users will successfully adopt your product.

When launching a product, you need to spend a lot of time and resources to attract a sufficient number of users. There are a variety of means to attract users to your app, including advertising, referral programs, public relations, and content marketing. But when people finally download the app, they sometimes feel abandoned or let down. Therefore, you must do a good job at showing users why they need your app and how they should use it.

Onboarding can sometimes be an integral part of the app, where we show the user how to behave within the app. This dive in effect is especially useful if we incorporated some new features that might be unfamiliar to our users. Tooltips can also be used to show them how things work.

The same approach can be used when we have complex systems. With tooltips we can explain why some things are there or why others are not. It’s something like a guided tour of your app, where hints are only triggered when the user reaches an appropriate point in their experience. Thus, hints may appear in different orders for different users and actions.

17 :: Tell me do you have a strong understanding of my business and its audience?

You can’t expect a mobile app developer to successfully build your app without understanding what it is you do and how the app will make a difference.

A potential candidate won’t have all the answers, but what you can do is take time from the interview process to educate them about your bottom line, your mission and goals for the app. If a developer takes an interest in what you do, it’s a positive sign. More importantly, they should have an interest in using the app itself.

A developer who has worked on apps of similar functionality, or who has clients in the same industry may be a positive fit. They’ll already have an understanding of your business model and will know what it will take to achieve mobile app success.

18 :: Tell us what are the main differences between desktop/web app development vs. mobile app development?

Different screen sizes and resolutions, variable connection speeds, battery consume, memory limitations… mention the problems inherent to mobile devices and go technical, show the hiring manager you truly know how to manage them.

19 :: Tell us how do you deal with input fields on mobile designs? Why are they important, how do they affect the end-result?

Input fields are a very important aspect of mobile design. We tend to take them for granted, especially when designing small websites or mobile apps.

When we need to design a corporate website where we have more than one contact form, then we should reconsider and reimagine these small elements. The whole point of doing this makes them invisible to the end-user, allowing users to focus on more important things. We don’t want our users to leave at a crucial point in their journey, when they need to input information or maybe even make a purchase. This usually happens on e-commerce websites when the user is required to fill in too many fields in order to complete the transaction. The trend is to streamline the process, and big players are getting involved with mobile wallet solutions as well.

For mobile design, it is important to provide clear, always visible labels for each input field. Clear labels make users feel more confident that they understand information in the right way, promting them to take action.

Data comes in many formats. Of course, we think that you should always try to design input fields in a way that resembles how users typically enter information. For instance, the phone number field can be auto-formatted. This eliminates any formatting ambiguity the customer may have had.

20 :: Please explain when do you choose a hamburger menu and how this is this pattern interpreted by the user?

Due to the fact that mobile design is constrained by the small size of mobile devices and their displays, it’s of vital importance that we present the information properly, and adequately prioritize content. It is very important to make sure this is done at this stage, before we proceed to mockup design, because that’s a matter of UX rather than UI design.

It’s also important to decide which information we provide first and which one will remain hidden. In order avoid hiding content, we can use different patterns like tabs, filters, and so on, while still providing the user with the most important information at the time. It’s a bad practice to use hamburger menu even though sometimes we are forced to use it due to the massive amount of data that needs to be displayed. Based on research, we can conclude that the hamburger icon easily gets “lost” in the design, because many users tend to start scrolling immediately. It’s in our nature to scroll and that why it’s important to make sure everything important is presented to the user at a glance.

According to a study by Nielsen/Norman Group, a global leader in user experience research, training, and consulting, hidden navigation patterns (like hamburger menus) decrease content discoverability by 21% and increase the amount of time it takes to actually use navigation by 2 seconds on average.

21 :: Please explain what is the best practice when it comes to designing icons for a mobile product? Which are better for scanning? What is the difference between a filled or outlined icon?

Iconography is a visual language used to represent functionality or content. Icons are used when we don’t have enough space to display textual content. Therefore, icons are meant to be simple visual elements that are recognized and understood immediately.

In practice, we will encounter both version of these icons. They can appear outlined or filled, but the whole icon set needs to be consistent and employ the same stroke. However, this is something that is more related to visual design. When it comes to UX, one thing is sure. If we use the outlined icons for the normal state, then we should probably use the filled icon for the active state of the button. It’s important to indicate which section is currently active by highlighting the icon in a specific way. Although we could change the color of the outline, this approach is not ideal when we are dealing with a light background, so it’s better to use the filled/outline approach. This makes recognition of active tabs and controls more straightforward. Icons at the end are here to serve as navigation to other section of the app.

22 :: Please explain how will we be working together?

Communication is a critical component of any project. Since you’ll be working very closely with your mobile app developer, you want to understand how you will be working together (i.e. how often will you be communicating with him or her).

Most developers use project management programs to list task, mark them when they’re completed, and send out progress notifications. Basecamp, Jira and Asana are examples of project management programs that are widely used today.

Ask the developer if they use a program like this. If they do, it’s a solid indication that they know how to keep track of deliverables, use the tool to communicate with key stakeholders, and track the progress every step of the way.

You should also identify how often you’ll want to speak with the developer. Will you schedule a weekly meeting set for a specific time and date?

23 :: Tell us have you participated in the creation of any app that is available in the iTunes or Android stores?

This is where you show off your work and talk about your experience. Point out the role you played in the development of each project and the difficulties you encountered when creating it. If you haven’t yet developed any professional app yet, you can show off the apps you have developed on your own or as school practices. It is a great idea to create an open source app before you apply for jobs.

24 :: Please explain how should one properly design push notifications? Why are they so important?

Based on user-research, annoying notifications are the primary reason why people uninstall mobile apps (71% of respondents in one recent survey).

But still, push notification are a feature which keeps an app alive. In other words, notifications are powerful tools for businesses to communicate directly with users and deliver the right message at the right time and place in order to promote engagement. So it’s really important to consider how these elements are designed.

It’s important that the messages are clear and understandable. No matter what the content of the notification is, make sure it speaks the same language as your users, literally and figuratively. Users, regardless of frequency, appreciate content that is directly related to their personal interests.

Timing is the second most important thing when we consider making push notification. Also, solution could be sending a notification out at a reasonable time that would be most effective to your users, unless it’s critical to inform them of something happening right now. In general, mobile usage peaks between 6pm — 10pm.

25 :: Can you tell us how do you deal with input fields on mobile designs? Why are they important, how do they affect the end-result?

Input fields are a very important aspect of mobile design. We tend to take them for granted, especially when designing small websites or mobile apps.

When we need to design a corporate website where we have more than one contact form, then we should reconsider and reimagine these small elements. The whole point of doing this makes them invisible to the end-user, allowing users to focus on more important things. We don’t want our users to leave at a crucial point in their journey, when they need to input information or maybe even make a purchase. This usually happens on e-commerce websites when the user is required to fill in too many fields in order to complete the transaction. The trend is to streamline the process, and big players are getting involved with mobile wallet solutions as well.

For mobile design, it is important to provide clear, always visible labels for each input field. Clear labels make users feel more confident that they understand information in the right way, promting them to take action.

Data comes in many formats. Of course, we think that you should always try to design input fields in a way that resembles how users typically enter information. For instance, the phone number field can be auto-formatted. This eliminates any formatting ambiguity the customer may have had.
Mobile Application Developer Interview Questions and Answers
35 Mobile Application Developer Interview Questions and Answers