6 Dec

How to Hire a Xamarin Developer

If you’re looking to hire an Xamarin developer for iOS and Android cross-platform development or a Mac desktop application, you need to know its benefits, drawbacks, and best Xamarin interview questions for 2018.

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.

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.

 

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 to hire can build apps in a way that gives the end user the behavior and design the expect with native user interfaces. They also have access to all native APIs, even including capabilities that are platform-specific like iBeacons and Android Fragments.

They do 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 talented Xamarin developer, you don’t have to worry about your applications not having native performance or behaviors.

 

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 to know C# very well.

This means that you have a larger talent pool to choose from, particularly if you let us help you find a vetted expert who isn’t bound by location.

 

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 intent

  • Lambdas are much more simple in C# than Java for Android and Objective-C

 

If you are looking for a Xamarin developer for hire, you will find 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.

 

Speed

There are two reasons that you can speed up the creation and shipment of your apps if you hire a Xamarin developer.

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 for hire will have to write fewer tests with one set of code.

Another reason there are less bugs is, as explained above, it’s more common to find a developer who is an expert in C#, just one language, rather than in both Java and Swift or Objective-C.

 

Best Xamarin Interview Questions in 2018

You understand the benefits of hiring a Xamarin developer, and now you just need to make sure you hire an expert. If you want a guaranteed, vetted expert, we can find the perfect developer for your needs. Then, you can be certain that they’ll ace these interview questions.

 

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 API’s.” 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.

Photo credit: Microsoft

 

You should use Xamarin.Forms for applications that need less functionality specific to its platform and when the 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.

 

Explain Xamarin.form’s life cycle

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, it 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).

 

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.

 

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

Console.WriteLine(o);

}

 

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

    Console.WriteLine(i);

}

 
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