Hire Cross-platform Developers

Demand for Cross-platform Developers Continues to Expand

According to Grand View Research, the mobile app development market is projected to reach $626 billion by 2030, with a compounded annual growth rate of 14.3% from 2024. This acceleration is accompanied by rising demand for cross-platform developers. Mobile applications are so pervasive that even the term “cross-platform development”—once used for desktop, web, or game platforms—now refers primarily to applications built to run seamlessly on both Android and iOS.

A cross-platform approach helps companies reduce development costs while providing apps that work consistently on both major mobile platforms—a facet that also lowers post-launch support costs. The best specialists in popular frameworks like Flutter and React Native don’t stay on the market long, particularly in countries with fierce competition for high-quality talent. At the same time, the growing job market and technical ecosystem in the cross-platform space make finding the right candidate a formidable task.

This guide details how hiring managers can identify quality cross-platform developers, evaluate them vis-a-vis team and project requirements, write an attractive job description, and select the most insightful interview questions to help them find and hire just the talent they need to succeed.

What Attributes Distinguish Quality Cross-platform Developers From Others?

Cross-platform developers are versatile mobile application engineers who can use a single codebase to deliver apps targeting iOS and Android without sacrificing the user experience on either operating system. Expert cross-platform developers often know multiple cross-platform frameworks (like Flutter, React Native, or .NET MAUI, the successor to Microsoft’s deprecated Xamarin), which can be especially helpful for projects involving framework migration or greenfield situations where the stack has yet to be defined. That said, a programmer specialized in just one framework can be equally effective given enough experience.

However, framework fluency alone is insufficient for app development solutions. Consider UX design skills: Quality cross-platform developers know how user experience extends beyond aesthetics, encompassing responsiveness, functionality, and intuitive navigation for users of either platform. Other oft-needed mobile application development skills include working with APIs or digging into native development with languages like Swift for iOS and Kotlin or Java for Android, particularly in performance-critical areas.

Since frameworks and libraries change rapidly, adaptability is also a key trait. React Native developers know the benefits and caveats of using newer features like Hermes engine integration, while Flutter developers similarly face changes like the Impeller rendering engine replacing Skia as the default.

Top-notch developers of cross-platform applications can also think in terms of higher-level technical and business strategies. Project management isn’t new to them—they know to anticipate roadblocks, design for scalability, and reduce long-term development costs through maintainable coding practices. More importantly, they have the communication skills to advocate for these issues collaboratively, whether with colleagues on a development team, managers, stakeholders, or even clients. For example, if a team’s development process lacks an appropriate element of quality assurance like test-driven development (TDD) or a continuous integration/continuous deployment (CI/CD) pipeline, a quality developer should know how to make a strategic, business-specific case for it.

How Can You Identify the Ideal Cross-platform Developers for You?

The ideal candidate depends on your project requirements and your team’s skill gap. For example, say you’re migrating a React Native project to Flutter and have a Flutter expert on staff, but your original React Native talent is no longer with the team. In that case, you’ll benefit from a developer with experience in both frameworks, particularly the version of React Native your codebase uses. However, if your Flutter expert can devote enough time to your project, their collaboration with a freelance or part-time React Native consultant may also be a practical approach.

Pricing concerns may tempt you to hire a junior cross-platform developer. This can be a cost-effective strategy, but only if you can ensure adequate supervision and mentorship from someone more experienced. A junior developer may be able to launch a greenfield project on their own, but without oversight, their work is more likely to have issues with quality assurance, code maintainability, and scalability in the medium term—potentially negating initial cost savings. Sophisticated user experiences and cutting-edge performance optimizations are best left to those with several years of experience in app development, even if it wasn’t all cross-platform.

Senior cross-platform developers can also distinguish themselves in raw programming language skill, but it’s highly contextual: A JavaScript expert adds minimal value if your codebase is in Java, because the two languages are completely different. For Flutter, this means Dart. For React Native, this means JavaScript (or TypeScript, which is much closer to JavaScript than either is to Java). But if your codebase involves platform-specific optimizations, other languages may be relevant too—Java or Kotlin (for Android) and Swift (for iOS). Unless your project involves web development, you generally won’t need front-end skills (e.g., Angular) or back-end skills (e.g., Node.js).

In either case, a track record of published apps with positive user testimonials or reviews is a strong signal of expertise. But don’t discount candidates who lack this—some may have spent their careers building internal or NDA-protected apps, which can provide equally valuable experience.

How to Write a Cross-platform Developer Job Description for Your Project

Once you’ve assessed your app development team and project requirements, it’s relatively straightforward to translate the details into an effective job description. It’s best to start with a mobile app developer job description template or, if it applies to your project, a framework-specific template like one for React Native developers. Either way, highlight in the first line—if not the job title—the cross-platform framework (or frameworks) involved and, if the position is remote, specific time zone expectations.

Continue with technical details, such as the programming languages and any key libraries candidates need to know, along with how much platform-native code there is to maintain. From there, include any specialized sectors you may be targeting (such as healthcare or e-commerce) and the end-product functionality you expect the new hire to implement. Clearly communicating expected project timelines, major milestones, and application development methodologies like Agile or Scrum can help further refine your candidate pool.

What Are the Most Important Cross-platform Developer Interview Questions?

The most important interview questions depend on the tech stack of your cross-platform project. Be sure to include app development questions specific to Android and iOS, as well as ones related to relevant languages (e.g., C#, Java, JavaScript, or Swift) and frameworks (e.g., React Native or Ionic). Then, use the conversation starters below to gain insights into your candidate’s abilities.

How do you ensure high performance and consistent user experience across iOS and Android?

Candidates must know how and when to use various profiling tools to produce a high-performance app. At the cross-platform framework level, Flutter has its DevTools suite, React Native developers often use Flipper, and .NET MAUI developers have access to Visual Studio Diagnostic Tools. However, for issues that manifest in the native layer—such as rendering delays or memory leaks—native tools like Android Profiler and Xcode Instruments can be more appropriate. From there, candidates should be able to describe optimization techniques such as lazy loading, asynchronous data handling, and minimizing overdraw.

How do you manage native modules and APIs when a cross-platform framework falls short?

Where Android and iOS offer different feature sets, cross-platform frameworks often provide a unified API to help developers stay in the framework ecosystem and avoid writing native code themselves.

But when necessary, developers must be comfortable creating or integrating native modules in Swift (iOS) or Kotlin (Android) and writing bridge code—whether through platform channels in Flutter, native modules in React Native, or partial classes and platform-specific services in .NET MAUI. The key to managing this lies in isolating, minimizing, and documenting divergent logic to ease maintenance and ensure comprehensive testing on various versions of both platforms.

What strategies do you use for managing app state and data synchronization across platforms?

Effective state management is essential to software development, especially for applications with real-time features like chat or social media integration. Mobile hardware then adds challenges like network fluctuations and battery usage to the mix.

A high-quality React Native or Flutter specialist should be able to speak to these challenges and compare at least two state management approaches. For React Native, common options include Redux, MobX, and Zustand. For Flutter, they include Provider, Riverpod, BLoC, and Fish Redux. Regardless of your project’s main cross-platform framework, a candidate should be able to explain and defend their favored state management architecture and how they approach offline functionality and conflict resolution.

Why Do Companies Hire Cross-platform Developers?

Companies hire cross-platform app developers because a unified codebase can dramatically reduce the cost of reaching users on both iOS and Android. Developers using frameworks like Flutter, React Native, .NET MAUI, and Ionic can help companies launch apps that deliver user experiences comparable to a native app, while controlling development and support costs.

With fierce competition in the mobile app space, companies investing wisely in cross-platform mobile app development gain key advantages. They lead the way with faster time to market and broader brand visibility, essential for long-term success.