How to Screen and Hire a Xamarin Developer with the Right Interview Questions

Hire a Xamarin Developer

If you’re looking to hire a Xamarin developer online for iOS and Android cross-platform development or a Mac desktop application, you need to know its benefits, drawbacks, and key Xamarin interview questions to test the coder’s technical skills.

Xamarin is a great tool because it can be used to build, test, and distribute apps with both Android and iOS while being fully .NET. 

For those non-techie readers, .NET is a developer platform made up of tools and programming languages for building different applications. Xamarin extends this .NET platform with more tools and libraries specializing in building apps for Android, IOS, tvOS, watchOS, macOS, and Windows. 

Using C# instead of Java, Objective-C, and Swift, the applications are still compliant with the distribution requirements of their respective stores, either Google Play or the App Store.

What does a Xamarin Developer do?

1. They’re native

Many developers or companies are against using tools that create both Android and iOS apps because the applications aren’t published with an intuitive interface or responses that are particular to one platform.

However, Xamarin developers can build apps that give the end-user the behavior and design they expect with native user interfaces. They also have access to all native APIs, including platform-specific capabilities like iBeacons and Android Fragments.

They build solutions that are interpreted at runtime, so Xamarin apps are compiled for native performance and can leverage platform-specific hardware acceleration. If you hire a Xamarin developer, you don’t have to worry about your applications not having native performance or behaviors.

2. The benefit of C# development

If you’d like to produce both Android and iOS applications, you need someone who is an expert in Java and either Swift or Objective-C. However, if you hire a Xamarin developer, it’s only necessary for them to know C# very well.

Some of the benefits of using C# are that it:

  • Features responsive, asynchronous programming. All others (Objective-C,
    Swift, and Java) require callbacks and manual bookkeeping
  • Less verbose language, often requiring less code for the same results
  • No need for casts and comments for collections and other compound types
    to be used safely
  • Xamarin tools also help with code completion and understanding
  • Lambdas are much more simple in C# than Java for Android and
  • Objective-C

If you are looking to hire a Xamarin developer, you will find yourself with a C# expert who can utilize this one language to build both Android and iOS applications. Additionally, Xamarin brings 100% of Apple’s iOS SDK and Google’s Android API to C#, enhancing both Objective-C and Java APIs with stronger types, async support, and .NET naming conventions.

3. Speed

There are two reasons why a Xamarin developer can speed up the creation and shipment of your apps. 

First, the obvious, is that you don’t have to develop two different applications from scratch. Instead, you can code the logic of the application just one time for both iOS and Android.

Of course, your Xamarin developer(s) still write code that is particular to one platform or the other for features specific to the Android or iOS app, but your development time is generally shorter.

The next reason is that there are typically fewer bugs to fix. This is both because there is less code with predominantly only one language and Xamarin tools to assist with testing. Additionally, your Xamarin developer will have to write fewer tests with one set of code.

What Skills to Look for in Xamarin Developers?

Knowledge of C# and ASP.Net 

Xamarin enables developers, through C#, to build apps for Android, IOS, and Windows. So, when interviewing candidates, one of the essential skills they should have is regarding C#.

You can also filter candidates by asking them about Model-View-ViewModel (MVVM). Cross-platform app development frameworks are based on MVVM,  a software design pattern, so all Xamarin developers should have a solid understanding of this.

API and Third Party Libraries

Xamarin provides extensive support to APIs and third-party libraries. You could ask candidates about previous projects to understand their familiarity with these help options.

Reusability of Code on Across Platforms 

As explained, Xamarin can create apps for both Android and IOs platforms. Skilled Xamarin developers would have no trouble describing how they reutilize the code set from one platform to another. 

Previous Work

One of the best ways to understand how a candidate works and their level of knowledge is through their previous work and learning experience. And we don’t necessarily mean that they must have graduated from top colleges and taken expert-level courses. But a successful developer never stops learning. Ask them about what resources they seek when getting stuck, or which are their favorite websites to learn about something in particular. Also ask about their previous work and see what they have created in the past. 

Hire a Talented Xamarin Developer

Best Xamarin Interview Questions To Ask in 2021

You understand the benefits of hiring a Xamarin developer, and skills they should have. Now you need to make sure you hire an expert. If you want a guaranteed, vetted expert, we can find the perfect developer for your needs.

But if you want to stick with the long recruiting process, we set up a couple of questions to help you ace your interviews and hire a talented Xamarin developer.

1. What are the different ways of creating a Xamarin application?

Xamarin gives developers two ways of creating native apps. First, there’s the traditional Xamarin approach that can provide direct access to platform-specific APIs. This method is used to create apps specific to certain platforms by using Xamarin.iOS and Xamarin.Android for creating iOS and Android applications, respectively.

The other option is through Xamarin.forms. This option is “the same as that of traditional cross-platform apps.” The typical method to do this is by implementing either Portable Libraries or Shared Projects in order to save the shared code. From here, you can create applications for each particular platform that will utilize the shared code.

Traditional vs Xamarin Forms
Photo Credit: Xamarin Help

You should use Xamarin.Forms for applications that need less functionality specific to its platform and when code sharing is more important than a particular UI.

Xamarin.iOS and Xamarin.Android, instead, should be utilized with apps that need a highly particular UI or design, require specialized interactions, or use many APIs that are platform-specific.

2. Explain Xamarin.form’s lifecycle

The life cycle is important for anyone developing mobile applications, particularly to hire a Xamarin developer. The life cycle details the application’s sequence from the start to the end of the application.

The most important calls include:

  • OnStart, which, as its name implies, is called when the application starts.
  • OnSleep, which gets called when the application is in the background but still active.
  • OnResume, which once again follows what the name implies and is called once the application is resumed after it returns from the OnSleep call.

With Xamarin, there’s no termination method. Instead, Xamarin will terminate after a certain amount of time that it’s in the OnSleep state without the need for additional code (unless, of course, there is a problem with the app and it crashes while in an active state).

3. Explain Jagged Arrays in C# and give an example of how to initialize it

Your Xamarin developer for hire needs to be an expert in both the Xamarin platform and C#, as this is the language that they’ll be coding with.

In C#, a jagged array is the term for an array of arrays. In C#, here’s an example of how to initialize a jagged array:

int[][] scores = new int[2][]{new int[]{92,93,94},new int[]{85,66,87,88}};

This represents an array of two arrays of integers. As you can see, scores[0] is an array of 3 integers, while scores[1] is an array of 4.

4. Explain Boxing and Unboxing

These both are used for type conversion in C#. Boxing is the process of converting a value type data type to the object or to any interface data date which is implemented by the value type.”

This concept highlights how any value type can be treated as an object in C#’s view of the type system.

This explanation sounds a bit confusing, but let’s see an example given by C# corner:

public void Function1()


int i = 111;

object o = i; //implicit boxing



Unboxing is also a process like this that’s “used to extract the value type from the object or any implemented interface type.” However, the difference is that unboxing must be performed explicitly by code, whereas boxing may be done implicitly. Here’s an example:

public void Function1()


object o = 111;

int i = (int)o; //explicit unboxing



How to Hire a Xamarin Developer at a Reasonable Rate? Think Globally and Hire Remotely

Hiring talented developers at a reasonable price sounds utopic.

Unless…you consider hiring a remote Xamarin developer. Think about it this way: Around the world, there are countries where the cost of living is much lower than yours. For example, if you live in The United States, an average developer charges 85K per year. On the other hand, in China, the average salary for a software developer is 26k per year. The only detail is that China, according to Hacker Rank, has the most talented developers. 

You can recruit talented Xamarin developers from different countries and see who fits better in your company. It seems like a lot of work, but it’s worth the talent. Although if you want to focus on your business instead of the recruitment process, let us handle it for you.

Freelancers and remote workers are not synonyms, as some people might think. Here are the main differences that will guide you to decide which one is better for your company, a freelancer, or a remote Xamarin Developer. 

Xamarin Freelancer Developer

Hiring a freelancer means hiring someone for a determined project without setting up an employment contract.  Freelancers are a good option if you have a small project or need to finish a specific task. They take the project, work on it, and deliver it (hopefully) on the estimated time. 

However, the saying ‘all that glitters is not gold’ applies perfectly to freelancers. In the first-place freelancing platforms tend to be chaotic, many bidders sometimes charge low prices but deliver low-quality results. When you hire a freelancer, you should have in mind that you are hiring someone who will also be focused on other projects besides yours. 

Remote Xamarin Web Developer

Remote employees are the same as onsite employees. This means that whether they are full-time or part-time employees, they sign a contract to work for your company. The only difference is the location; onsite employees need to come to your office to work every day while remote employees can be everywhere. Your office could be in Texas, and you can perfectly hire a full-time remote developer that lives in Eastern Europe.

One of the best parts of hiring remote employees is the talent pool. While staying in the same area, you could get a good Xamarin developer, but if you extend your search to the entire world, you could get more than 1 excellent candidate who charges a lower salary because of the living costs of their country. Someone who will be devoted entirely to your company and that despite their location will be able to understand your company’s processes and culture. 

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Ihor leads the team at the core of what makes DistantJob successful – our incredible recruitment team! With over 8 years of experience as an IT recruitment professional, Ihor’s experience covers the whole breadth of the staffing and recruitment lifecycle – from sourcing and recruiting top-notch developers himself, to leading teams of recruiters.