Growing Cross-platform Development Necessitates Skilled Xamarin Engineers

We live in a mobile-obsessed world—the mobile app market is estimated to have a CAGR of 13.9% from 2023 to 2030—where any modern business must have a strong presence on phones and tablets. With the need to accommodate a wide variety of devices, it can be challenging to develop applications that reliably provide a good user experience. As a result, cross-platform development is growing to meet these needs, boasting a high CAGR of 16.8%. Xamarin is a popular option among available mobile frameworks, and Xamarin app development expertise remains in demand across industries.

Programmer logos over a global map, with blue developer icons in various locations and a magnifying glass over a green developer icon.

However, hiring a specialist comes with unique challenges—whether you plan to maintain an existing app or migrate to .NET or .NET MAUI. Finding developers versed in mobile app development (Android and iOS) and the Microsoft ecosystem can be difficult and time-consuming.

This hiring guide breaks down the critical skills to look for in top engineers, provides tips for writing a compelling job description, and suggests interview questions to help you identify the top candidates.

What Attributes Distinguish Quality Xamarin Developers From Others?

Before starting the hiring process, defining clear goals and project requirements is essential to finding the right developer for your needs. Begin by understanding your target users and the platforms your app will support—whether smartphones, tablets, desktops, or wearables—and whether it needs to run on iOS, Android, Windows, or all of them.

Next, consider the scope and complexity of the app. Define the features and functionalities you want, from simple tasks to advanced integrations, which will give you a sense of the skills required.

Finally, establish a realistic timeline and budget. These factors will directly influence the type of developer or team you need. A well-defined timeline and budget also help set expectations and ensure alignment with your chosen developer’s capabilities.

Whether you’ve chosen the platform to develop a new product or have an existing app that requires specialized expertise, you should define your skills gap at the start of the hiring process. These questions will help inform the skill requirements and developer level that best suits your needs:

How complex is the project and its core business logic?
What other technologies does the team use?
Does your app require data collection or advanced API integrations?
Does your project have large tech debt or existing bugs?

With that information in hand, you should aim to find a developer with the following skills:

Mobile or app development: Candidates must be familiar with test automation tools, architectural patterns, and UI/UX development for platforms like iOS, Android, macOS, and/or Windows.
C#: Xamarin apps are built using C#, an object-oriented programming language common among .NET applications. A strong foundation of C# experience enables developers to navigate the Xamarin ecosystem effectively and build successful apps.
.NET: Xamarin is part of .NET, extending it with cross-platform tools and capabilities. As such, developers must have a solid understanding of the .NET framework, its most helpful features, and its latest versions.
Visual Studio: Microsoft’s Visual Studio offers an integrated development environment (IDE) and equips an app developer with vital tools for development, deployment, debugging, and testing. (It has replaced tools such as Xamarin Studio and Xamarin Test Cloud.)
APIs: Xamarin programmers must master APIs because cross-platform apps rely on external data processing, which is critical for consistent performance across platforms. Skilled API integration allows developers to create smooth, responsive apps by connecting to services, databases, and backend systems seamlessly. Tools like cURL and Postman are essential for testing these integrations, ensuring reliable communication and resolving data flow issues.

Though many developer skills overlap with the requirements for .NET or app development, Xamarin engineers are experts in developing code that is shared among operating systems and have specialized experience in building custom, reusable code solutions. Code reusability differentiates a developer who may know C# from an expert.

An arrow points up from a keyboard to a development, from which arrows point to logos for Android, iOS, Windows, Linux, and an ellipsis indicating other options.

Another important aspect to consider is soft skills. Strong communication, teamwork, and problem-solving abilities complement specialized technical expertise and enable developers to integrate smoothly with a team and collaborate effectively.

How Can You Identify the Ideal Developer for You?

Selecting the right developer involves several key considerations that can significantly impact your project’s cost, development speed, quality, and management overhead. You’ll need to assess the seniority level of the developer—based on the complexity of your project and the skills gap you aim to fill—choose an appropriate engagement model and determine whether to hire freelancers or partner with outsourcing companies.

Deciding on a Junior, Mid-level, or Senior Developer

Any engineer with a solid C# background can be regarded as a junior developer and can deliver results quickly on smaller projects (e.g., a simple form app). However, be prepared to allocate extra time and resources while they learn the fundamentals of the framework, which is not ideal if development time is your priority.

Mid-level developers are familiar with the nuances of the framework and the most-used patterns and objects. These include concepts like the Model-View-ViewModel (MVVM) design pattern, the Command class, .NET Standard Library (or its predecessor PCL), and .NET MAUI or its predecessor, Xamarin.Forms. Engineers at this level should be able to develop an app from scratch.

Senior developers are highly skilled experts who can make architectural decisions. They should know how to implement native Android or iOS solutions, use advanced debugging techniques, and identify and prevent memory issues on different operating systems. Senior engineers know the differences between operating systems and devices and can effectively deploy a product to various targets. If you’re building an e-commerce app, it’s especially important to hire developers with experience in secure payment integration, backend API communication, and real-time user interaction to ensure a smooth and reliable shopping experience.

Hiring a mid-level or senior developer may pay off in the long term for most projects. Typically, the main goal of using a multiplatform development technology is to share most—if not all—of the code. Hiring someone without experience in designing efficient architecture and developing reusable, innovative solutions can lead to tech debt that will compound over time.

Hiring Models for Xamarin Developers

There are several engagement models to consider when hiring developers, each with its own benefits and payment structures:

Dedicated team model: A team of developers works exclusively on your project. This approach provides a high level of control over the development process as the team becomes familiar with your project’s specific needs and objectives. The developers are fully committed to your project, which can lead to increased efficiency and better alignment with your goals. The payment structure usually involves a fixed monthly fee for each team member, allowing for predictable budgeting and resource planning.

Controlled Agile: The controlled agile model is a hybrid engagement approach that combines the flexibility of agile development methodologies, where projects are broken down into smaller, more manageable iterations or sprints, with the predictability of controlled budgeting. This model is ideal for projects where requirements may change or evolve during development. It allows for adjustments as the project progresses, ensuring that the final product meets your expectations. Payments are typically made based on agreed-upon milestones or deliverables, balancing cost certainty, pricing flexibility, and adaptability.

Time and Material: The time and material model involves paying for the actual time and resources spent on the project. This approach offers the greatest flexibility to alter the project scope, making it ideal for complex projects with uncertain or evolving requirements. You pay for the developers’ time based on hourly or daily rates, plus the cost of any materials used. While this model allows you to adjust priorities and requirements as needed, it may make budgeting more challenging due to the variable costs involved.

Freelancers vs. Outsourcing Companies

When deciding how to staff your project, you might consider hiring freelancers or partnering with an outsourcing company. Each option has its advantages and trade-offs.

Freelancers often have lower overhead costs than agencies or companies. They can be hired on a project-by-project basis, offering flexibility and scalability to suit your specific needs. However, working with freelancers requires direct management and communication, which can be time-consuming. The quality and reliability of freelancers can vary greatly; therefore, thorough vetting is necessary to ensure they possess the required skills and are dependable.

Outsourcing companies are typically more expensive due to company overhead and their comprehensive services. They often provide vetted teams with a proven track record, ensuring higher quality and reliability. These companies can quickly onboard teams to accelerate development timelines, which is advantageous if speed is a priority. Additionally, outsourcing companies require less direct management, as project managers often handle coordination and oversight, reducing the management overhead on your part.

Considering Xamarin Versus Flutter Developers

Flutter is a growing cross-platform development framework backed by Google. You may wonder which framework will best suit your project needs.

Xamarin developers often best serve enterprise mobile applications because it is a more mature technology heavily integrated with the entire Microsoft ecosystem (e.g., Visual Studio, Office, Azure). Flutter developers, on the other hand, excel in creating visually appealing and high-performance apps with a rich widget library and seamless design integration.

In general, it makes sense to choose Xamarin experts for the fast development of enterprise mobile applications if you already have a dedicated C# team.

How to Write a Job Description for Your Project

A well-crafted job description that offers relevant details about your company, the role, and the project will attract top talent to apply for your posting. Start with a clear description of your project and application:

What platforms are you targeting (e.g., is the project targeting only smartphones, including desktops, or tailored toward a niche platform like tvOS)?
Will the app need to integrate with any external app, API, or system?
Are you building an app from scratch or revamping an existing solution?
What technology stack will be used, and what resources are available (e.g., mock-ups, storyboards)?

When hiring, it is essential to clearly define the role’s responsibilities and technical requirements since its developers need a broad, specialized skill set in mobile development, .NET, and C#.

What Are the Most Important Xamarin Interview Questions?

Preparing practical interview questions in advance will prepare you for success and allow you to complete the hiring process quickly. A good candidate may be fielding several offers, and you may lose out on their expertise if you take too long to decide.

The following questions and answers offer insight into the thought processes and problem-solving approach developers should take during an interview. Detailed, clear answers demonstrate that a candidate has relevant experience.

This list is not exhaustive, and you should tailor your questions toward your application platform and technology stack. For example, include questions about mobile, C#, and/or .NET as appropriate.

What strategies do you use to optimize Xamarin applications for performance across multiple platforms, and how do you handle platform-specific requirements?

Experienced developers understand that creating a performant cross-platform application often requires platform-specific optimizations. Key strategies to enhance app performance might include minimizing memory usage by avoiding unnecessary object instantiation, using async/await for smoother UI, and effectively managing resource-intensive tasks. Skilled developers can also discuss techniques such as custom renderers to create optimized, native UI components on different platforms and dependency injection for streamlined platform-specific services.

Additionally, candidates should be able to explain how they handle platform-specific requirements without compromising the shared codebase. This may involve using dependency services, custom renderers, or platform-specific projects to maintain performance and consistency.

What is XAML? Can you create a Xamarin `Page` without XAML?

XAML (eXtensible Application Markup Language) is a markup language that defines user interfaces in Xamarin, separating UI from code. XAML is preferred for building views in Xamarin.Forms, allowing for a clear and maintainable code structure. While XAML is similar to XML, it includes specific elements and syntax for defining UI properties, such as data bindings, property elements, and attached properties.

Creating a Page without XAML is possible by writing UI in C#, but using XAML provides productivity tools like XAML Hot Reload, which lets developers see UI changes in real-time without rebuilding, helping teams work more efficiently.

How does Xamarin increase an application’s ROI?

In general, it increases ROI by achieving development for multiple platforms with a single codebase. With the resources needed for one app, a team can cover various target operating systems, including iOS, Android, macOS, and Windows. Developers of all levels should be able to articulate the platform’s fundamental value proposition.

However, when hiring advanced consultants or architects, expect candidates to answer this question with a detailed plan specific to your project; they might suggest specific performance optimization solutions or code architecture changes.

Why Do Companies Hire Xamarin Developers?

As Microsoft’s open-source technology for cross-platform mobile application development, Xamarin streamlines the development process with a shared codebase that can be compiled and run across different operating systems. Companies that hire Xamarin app developers can deliver cross-platform apps faster and more cost-effectively.

Though popular competing cross-platform frameworks exist (e.g., Flutter or React Native), Xamarin uses C# as its programming language. Because C# is so widely used, companies already working with C# or using a Microsoft environment can quickly leverage their existing knowledge and resources to develop apps.

Moreover, the platform has the added benefits of powerful tooling and Microsoft integrations. For example, software engineers can use Xamarin Profiler to evaluate an app’s performance on different mobile platforms. And Visual Studio, Microsoft’s IDE, offers robust solutions for deploying and debugging applications.

Whether starting a Xamarin/.NET app from scratch, expanding your existing Microsoft ecosystem, or adding developers to support a mature app, hiring the right experts will boost your team’s speed and efficiency.

The technical content presented in this article was reviewed by John Puddifoot.