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While the Xamarin framework may no longer be the go-to choice for cross-platform app development, many businesses still rely on expert support to maintain and update their legacy apps. As we enter a new era of .NET MAUI development, it's crucial to find the right partners who can guide you through seamless migrations without downtime. In this article, we'll highlight the top swift app development companies in the USA for 2026, focusing on those with deep expertise in C# and .NET.

Introduction

As we move into a new decade, thousands of apps across various industries still rely on Xamarin to power their functionality. With Microsoft ending official support for Xamarin in 2024, businesses face two key choices: continue maintaining their existing Xamarin apps or migrate to the latest .NET MAUI framework. To achieve a smooth transition without disruption, it's essential to partner with experienced swift app development companies.

These top-tier providers aren't just generic mobile developers; they're .NET specialists who understand every layer of the Microsoft ecosystem. Whether you're looking to extend the life of your current app or transition to the latest cross-platform technology, these expert teams can guide you through the process with zero downtime and minimal disruption.

Top Swift App Development Companies in USA for 2026

Here's our curated list of leading providers for legacy Xamarin support and .NET MAUI migration:

1. Wildnet Edge

  • Headquarters: New York, Seattle, Austin, & more
  • Services: Legacy Xamarin App Maintenance, Xamarin.Forms to .NET MAUI Migration, Custom .NET MAUI Development, Performance Optimization, and Security Audits for Xamarin Apps, Swift Developers on demand.
  • Industries Served: Healthcare, Finance, Logistics, Retail, Education, Manufacturing.
  • Key Highlights:

+ Over 19 years of industry experience (Founded in 2005).

+ Enterprise-scale team of 350+ certified engineers.

+ Proven track record with 8,000+ projects delivered.

+ Deep expertise in the entire Microsoft .NET ecosystem (C#, .NET Core, Azure).

Wildnet Edge leads our list as one of the top swift app development companies due to their comprehensive mastery of the entire Microsoft .NET ecosystem. They specialize in seamless migration from Xamarin.Forms to .NET MAUI, ensuring better performance, updated design, and full compatibility with the latest iOS and Android systems.

2. Vention

  • Headquarters: New York, NY
  • Services: Custom Software Development, Mobile App Development, .NET Development, Staff Augmentation.
  • Industries Served: FinTech, HealthTech, E-commerce, and Real Estate.
  • Key Highlights:

+ Founded in 2002.

+ Enterprise-scale team (1,000+ employees).

+ Strong focus on providing elite, dedicated development teams.

Vention is a global software engineering leader known for providing access to top-tier technical talent. As one of the top swift app development companies, they are an ideal partner for businesses that need to scale their .NET development capabilities quickly with senior C# and .NET MAUI engineers.

3. ScienceSoft

  • Headquarters: McKinney, TX
  • Services: Custom Software Development, Application Modernization, .NET MAUI Migration, Healthcare IT.
  • Industries Served: Healthcare, Manufacturing, Financial Services, Retail.
  • Key Highlights:

+ Founded in 1989.

+ Large team (250-999 employees).

+ Over 30 years of IT industry experience.

With a long history in the industry, ScienceSoft is a highly reliable choice for complex .NET projects. Their inclusion as one of the top swift app development companies is due to their proven methodology for application modernization, making them a safe bet for businesses with mission-critical legacy Xamarin apps in high-compliance sectors.

4. Chetu

  • Headquarters: Plantation, FL
  • Services: Custom Software Development, .NET Development, Mobile App Development, Staff Augmentation.
  • Industries Served: Healthcare, Finance, Retail, Hospitality, Gaming.
  • Key Highlights:

+ Founded in 2000.

+ Massive scale (1,000+ employees).

+ Provides industry-specific developer teams.

With over 1,000 employees, Chetu delivers custom software development at scale. They offer .NET, Xamarin, and MAUI services, making them perfect for organizations that need big teams for complex migration projects.

5. Saritasa

  • Headquarters: Newport Beach, CA
  • Services: Custom Software Development, Mobile App Development, IoT, Web Development.
  • Industries Served: Logistics, Healthcare, FinTech, Real Estate.
  • Key Highlights:

+ Founded in 2005.

+ Mid-sized team (50-249 employees).

+ Strong focus on full-stack development (including .NET).

Saritasa is a full-service development company with a strong track record. Their expertise in complex integrations and IoT makes them an attractive choice for businesses looking to modernize their existing apps or develop new ones.

These top swift app development companies have the skills, experience, and resources to help you navigate the transition from Xamarin to .NET MAUI without downtime. Whether you're looking to extend the life of your current app or transition to the latest cross-platform technology, these expert teams can guide you through the process with zero disruption and minimal business impact.