Microsoft .NET 9 & .NET 10 • Xamarin Native & MAUI Architects
Stop maintaining four separate codebases—or getting stuck when third-party plugins break. We engineer native-compiled ARM64 mobile and desktop applications from a single, type-safe C# and XAML/.NET Blazor Hybrid codebase, backed by rare low-level Xamarin Native (UIKit / Android SDK) expertise that solves the "impossible" platform bugs other teams walk away from.
Full-Cycle Capabilities
We deliver mission-critical mobile and desktop applications engineered by senior specialists with deep low-level platform mastery—not surface-level framework dabblers.
Native UIKit and Mac Catalyst rendering via optimized MAUI Handlers, StoreKit 2 in-app purchases and auto-renewing subscriptions, Apple Push Notification service (APNs), FaceID/TouchID biometrics, on-device CoreML neural inference, and strict App Store Connect & DSA compliance.
High-frame-rate Android apps compiled with Native AOT and Startup Tracing. Adaptive Material Design 3 layouts, Google Play Billing Library v7+ with Cloud Pub/Sub real-time webhooks, foreground services, Android 15/16 16KB memory page compatibility, and robust background sync.
Unified Single-Project architecture sharing app resources, global fonts, responsive SVG vector graphics, C# domain models, and MVVM ViewModels across smartphones, high-resolution tablets, and foldable form factors with zero code duplication.
Enterprise line-of-business desktop software powered by WinUI 3 on Windows and Mac Catalyst on macOS. Featuring native multi-window management, menu bars, system tray integration, hardware serial/USB device communications, and Microsoft Office/Outlook add-in interoperability.
Unify mobile, desktop, and web with BlazorWebView. Share 100% of your Razor UI components across iOS, Android, Windows, macOS, and the browser (Blazor WebAssembly / Server) while retaining direct C# access to device sensors, storage, and native OS APIs without JavaScript sprawl.
End-of-life Xamarin rescue. We convert legacy Custom Renderers to lightweight MAUI Handlers, fork and upgrade abandoned open-source controls in-house, and migrate .NET for iOS and .NET for Android native projects to prevent App Store and Google Play rejections.
Transform legacy Windows-only desktop software into modern, cloud-connected cross-platform .NET MAUI applications. We preserve battle-tested business logic while introducing modern fluent UI, automated updates, macOS support, and mobile companion experiences.
Pixel-perfect adaptive layouts, fluid light/dark theming, custom-drawn 60fps charts and canvases using Microsoft.Maui.Graphics and SkiaSharp, alongside custom native handler overrides for enterprise control suites (Syncfusion, DevExpress, Telerik).
Integrate offline machine learning models (ONNX Runtime, CoreML, local vision and audio pipelines) and local encrypted SQLite + Entity Framework Core databases with automatic background conflict-free synchronization when cloud connectivity resumes.
Memory leak elimination, dotnet-trace CPU and startup profiling, automated UI testing via Appium and XCTest, enterprise CI/CD pipelines via GitHub Actions and Azure DevOps, and proactive maintenance for annual Apple iOS and Google Android OS releases.
Real-World Case Studies
When third-party libraries break, open-source maintainers vanish, or complex native protocols fail, standard agencies hit a wall. Here is how our deep native expertise rescues mission-critical enterprise systems.
A client's mission-critical app was completely blocked from launching on iOS due to an internal lifecycle bug inside third-party Syncfusion UI controls. Previous contractors declared the issue impossible to fix without waiting months for an official vendor release.
Because delaying production was not an option, we inspected the underlying iOS UIKit visual tree and control lifecycle, engineering a custom native Handler override and property mapper interception that bypassed the broken third-party code path on iOS while keeping cross-platform XAML data bindings fully intact.
The iOS app shipped to the App Store on schedule with 100% control stability, saving the client months of delay and contract revenue that other agencies had written off as unfixable.
Across multiple enterprise migrations, existing apps relied heavily on open-source UI controls and community plugins whose original authors had abandoned maintenance—leaving no .NET 8/9 compatibility, broken handlers, and failing store compilation builds.
Rather than forcing clients into costly UI rewrites or stripping out signature features, we took ownership of the unmaintained source code in-house. We refactored legacy Xamarin.Forms renderers into modern IViewHandler implementations, fixed memory leaks, and compiled them against modern iOS and Android target SDKs.
Clients preserved their exact user workflows and brand identity on modern .NET MAUI with full, self-contained code maintainability and zero dependency on abandoned external repositories.
Back in 2017—long before standardized WebAuthenticator or unified social login packages existed—a client required unified federated authentication across Google, Facebook, LinkedIn, and Apple ecosystems. Prior attempts by other developers had completely stalled.
We engineered a custom, protocol-level OAuth 2.0 and OpenID Connect (OIDC) authentication pipeline from scratch. We handled native browser session callbacks (SFSafariViewController on iOS and CustomTabs on Android), deep-link URL scheme interception, cryptographic token exchange, and hardware-backed keychain storage.
Delivered rock-solid, multi-provider single sign-on across all identity providers, transforming what seemed like a hopeless architectural roadblock into a high-converting, friction-free onboarding flow.
Most cross-platform developers only understand high-level XAML abstractions and hit an impenetrable brick wall whenever an app requires low-level OS hardware bridges, custom Bluetooth protocols, or specialized native view performance.
We are among the few engineering teams with extensive hands-on experience building complete Xamarin Native apps (Xamarin.iOS / Xamarin.Android, now .NET for iOS and .NET for Android). Because we have built apps directly using Apple's native UIKit and Google's native Android XML in C#, we know exactly what executes beneath .NET MAUI's abstraction layer.
We write native platform bindings, PlatformView extensions, and custom memory-managed handlers with zero guesswork—unlocking true native device performance on every target platform.
Flagship In-House Proof of Execution: We don't just build for clients; we ship and monetize our own consumer applications. Our flagship product, VisionFlow AI (visionflowai.app), is a production cross-platform ecosystem engineered on .NET MAUI 10 with native iOS, Android, and macOS Desktop (.dmg) builds. Powered by Google Vertex AI (gemini-3.1-flash-image), it delivers 2K photo restoration, studio headshots, and biometric-safe image editing live on Google Play. Review our Support Center and Privacy Policy for full compliance details.
End-of-Life Xamarin Rescue
Microsoft ended official Xamarin support on May 1, 2024. Both Apple App Store (Xcode SDK rules) and Google Play (Target API level & 16KB memory page requirements) now reject outdated Xamarin builds. Our 4-step migration pipeline ensures zero business disruption.
We analyze your legacy .csproj structure, inspect third-party NuGet dependencies, and catalog deprecated controls. Any unmaintained open-source packages are identified for in-house forking or replacement with modern MAUI equivalents.
We transition multiple platform heads into a modern, unified .NET 9/10 SDK-style Single Project. We migrate assets (SVG icons, splash screens, fonts) to the automatic MAUI asset pipeline and map Xamarin.Essentials directly to Microsoft.Maui.Devices.
We systematically replace heavy legacy Custom Renderers with decoupled, high-performance .NET MAUI Handlers and Property Mappers. Any low-level Xamarin.iOS or Xamarin.Android native bridges are cleanly ported to modern .NET platform bindings.
We enable Native AOT and LLVM marshaling, test for Android 16KB page-size compatibility and latest iOS SDK requirements, configure automated store release tracks via GitHub Actions or Azure DevOps, and deploy your updated app seamlessly to production.
Enterprise Ecosystem
We engineer end-to-end solutions, connecting native mobile and desktop clients directly to high-throughput cloud backends and on-device neural runtimes.
Clean Architecture, MVVM Toolkit with Source Generators, Dependency Injection, .NET for iOS (UIKit/CoreGraphics), .NET for Android (Material 3/ART), WinUI 3, and Mac Catalyst native bridges.
Declarative XAML, BlazorWebView hybrid Razor components, Microsoft.Maui.Graphics, 60fps custom canvas rendering via SkiaSharp, and native workarounds for Syncfusion, DevExpress, and Telerik suites.
Local SQLite databases with Entity Framework Core, LiteDB, and hardware SecureStorage backed by iOS Keychain and Android EncryptedSharedPreferences with background cloud queues.
Custom OAuth 2.0, OpenID Connect (OIDC), Microsoft Entra ID, social auth (Apple, Google), ASP.NET Core REST APIs, SignalR real-time hubs, gRPC, Azure, and Google Cloud Platform.
Local ONNX Runtime Mobile, CoreML neural models, Bluetooth LE (BLE), NFC, camera pipelines (Camera2/AVFoundation), and hardware biometrics.
Automated build and test pipelines via GitHub Actions and Azure DevOps, Appium and XCTest automated testing, Fastlane, and dotnet-trace memory leak profiling.
Architectural Evaluation
An objective, technical comparison across enterprise criteria showing why .NET MAUI delivers the lowest total cost of ownership for Microsoft-aligned teams.
| Evaluation Criteria | .NET MAUI (.NET 9/10) | Flutter (Google) | React Native (Meta) | Separate Native (Swift / Kotlin) |
|---|---|---|---|---|
| 1. Primary Language & Type Safety | C# 13 / .NET — Robust compile-time type safety, async/await, source generators, LINQ, and unified BCL. | Dart — Strong typing and sound null safety; specialized to Flutter ecosystem. | JavaScript / TypeScript — Requires TypeScript compilation; prone to runtime npm dependency drift. | Swift & Kotlin — Excellent native languages, but isolated in completely separate developer ecosystems. |
| 2. UI Rendering Engine | Native OS Controls via Slim Handlers (plus optional Blazor Hybrid / SkiaSharp). Real platform views on every device. | Canvas-Drawn via Impeller/Skia — Custom rendering engine that mimics native controls; non-native accessibility quirks. | Native Views via JS Bridge / JSI — Renders native components orchestrated across JavaScript runtime thread. | 100% Native OS Controls — Direct platform UIKit and Jetpack Compose / Android XML rendering. |
| 3. Direct Native Escape Hatch | Direct in C# — Full access to UIKit, AppKit, WinUI 3, and Android APIs via .NET for iOS & .NET for Android. |
Platform Channels — Requires writing custom Java/Kotlin and Objective-C/Swift bridge code with binary serialization. | Native Modules — Requires writing and maintaining separate Objective-C/Swift and Java/Kotlin bridge layers. | Direct Native — Full access without any framework overhead. |
| 4. Code Sharing (Mobile, Desktop, Web & API) | Up to 95% Shared — 100% shared C# domain models, ViewModels, validation rules, and EF Core DTOs with ASP.NET Core & Blazor. | Mobile & Desktop Shared — Cannot share business logic or domain types directly with enterprise C# backends. | Web & Mobile Partial — React web components require separate styling and state bridges for mobile. | 0% Shared Code — Business logic, validation rules, and network models must be duplicated 2 to 4 times. |
| 5. Compilation & Performance | Native AOT / ARM64 Machine Code with startup profiling; zero JS bridge bottleneck. | Ahead-of-Time (AOT) Compiled Dart to ARM machine code; high frame rates. | Hermes Bytecode Engine executing on JavaScript thread with native bridge communication. | Native Binary Compilation optimized directly by Apple LLVM and Android ART. |
| 6. Long-Term Total Cost of Ownership (TCO) | Lowest Enterprise TCO — Single unified C# engineering team supports iOS, Android, macOS, Windows, and ASP.NET Core backends. | Medium TCO — Requires dedicated Dart specialists alongside separate backend engineering staff. | Medium-High TCO — Frequent third-party bridge breaking changes during major React Native upgrades. | Highest TCO — Requires hiring, managing, and synchronizing 2 to 4 separate engineering departments. |
Enterprise Domains
We build mission-critical, high-concurrency cross-platform applications tailored to strict industry compliance and operational demands.
Biometric authentication (FaceID, fingerprint), custom OAuth 2.0/OIDC security, encrypted local SQLite ledgers, and real-time SignalR market data streaming with PCI-DSS compliant workflows.
Offline-capable clinical tablet software, Bluetooth LE (BLE) medical device telemetry, encrypted patient data stores, and HIPAA-ready telemetry engineered for hospital environments.
Offline-first route planning, barcode, QR, and NFC hardware scanning, background GPS tracking, and automated conflict-free cloud synchronization for remote field operators.
On-device neural inference using ONNX Runtime and CoreML, local photo restoration, low-latency camera capture pipelines, and desktop media companion software.
Role-based Blazor Hybrid dashboards running identically across Windows workstations, macOS laptops, iPads, and ruggedized Android warehouse terminals.
High-converting mobile storefronts featuring native Apple Pay, Google Pay, StoreKit 2 subscriptions, and Google Play Billing with real-time webhook order fulfillment.
Collaboration Framework
Whether you need an end-to-end product delivery, dedicated senior .NET MAUI firepower, or an urgent migration rescue sprint, we adapt to your roadmap.
Ideal for new greenfield mobile/desktop applications or complete platform rewrites. We own architecture, UI/UX, .NET MAUI engineering, cloud APIs, QA, and store submissions under clear milestone deliverables.
Embed senior .NET MAUI and Xamarin Native engineers led directly by Principal Architect Zeeshan Dad Khan into your team. Accelerate your roadmap without the recruiting delays or long-term overhead of full-time staff.
A focused, time-boxed architectural engagement designed to rescue stalled Xamarin migrations, fork and modernize abandoned open-source controls, or bypass critical third-party SDK bugs.
Disciplined Execution
From initial dependency mapping to post-launch OS compatibility updates, our process eliminates surprises and guarantees predictable production delivery.
We review functional requirements, target operating systems, hardware peripherals, and existing backend endpoints. We map out Clean Architecture boundaries and evaluate third-party libraries for long-term viability.
We design cross-platform adaptive design systems optimized for touch on mobile and high-density pointer interactions on desktop, validating responsive layouts across real iOS and Android viewports.
We build in iterative two-week sprints with testable TestFlight and Google Play Internal Track builds delivered directly to your stakeholders, maintaining clean C# code and source-generated MVVM ViewModels.
Testing on physical iPhones, iPads, Android smartphones, Macs, and Windows PCs. We execute dotnet-trace memory profiling to eliminate memory leaks and run automated Appium UI regression suites.
We configure App Store Connect, Google Play Console, and Windows MSIX signing, ensuring 100% compliance with privacy nutrition labels, in-app account deletion, and 16KB memory page requirements.
We provide ongoing enterprise SLAs to maintain compatibility with annual Apple iOS, Google Android, and Microsoft .NET major releases, ensuring your applications never experience deprecation churn.
Frequently Asked Questions
Key technical and business questions CTOs, product managers, and founders ask before initiating a .NET MAUI project.
Microsoft .NET MAUI (.NET Multi-platform App UI) is the official evolution of Xamarin.Forms, engineered on modern .NET 8 LTS and .NET 9+. It enables enterprises to build truly native iOS, Android, macOS, and Windows applications from a single C# codebase with up to 95% code sharing. Unlike web-view wrappers or JavaScript bridges that introduce runtime serialization overhead, .NET MAUI compiles directly to native ARM64 machine code and renders 100% native platform controls via decoupled MAUI Handlers, providing peak 60fps/120fps UI performance and deep OS API integration.
You do not have to wait months for upstream vendor patches or abandon features. Because our architects have deep low-level experience with Apple's UIKit and Android's SDK, we routinely inspect native control hierarchies to engineer custom Native Handlers and property mapper overrides that bypass vendor bugs. For abandoned open-source libraries, we fork the repositories in-house, modernize legacy renderers into .NET MAUI handlers, eliminate memory leaks, and compile them directly against modern target SDKs so your release schedule remains completely unaffected.
.NET MAUI provides a cross-platform XAML or Blazor abstraction over UI, compiling down to native platform controls via Handlers. Xamarin Native (now .NET for iOS and .NET for Android) uses C# to directly code against native Apple UIKit/Storyboards and Android XML/Jetpack APIs without any UI abstraction layer. KARIM CodeCrafters is one of the rare engineering consultancies with over a decade of production experience in pure Xamarin Native alongside .NET MAUI. This low-level foundation allows us to write native platform bindings, custom native bridges, and zero-overhead performance optimizations that high-level XAML agencies cannot match.
A focused Xamarin-to-.NET MAUI migration or MVP typically takes between 4 to 8 weeks, while comprehensive enterprise systems featuring offline sync, custom hardware integrations, and complex cloud backends span 10 to 16+ weeks. Because .NET MAUI shares business logic, ViewModels, validation rules, and network DTOs across mobile, desktop, and web, clients realize an average of 40% to 60% reduction in Total Cost of Ownership (TCO) compared to maintaining separate Swift, Kotlin, and desktop codebases.
Microsoft officially ended all support for Xamarin.Forms and Xamarin Native on May 1, 2024. More critically, Apple App Store Connect enforces current iOS SDK requirements built with Xcode, and Google Play rejects app updates that do not target the latest Android API levels and meet 16KB memory page-size compatibility. Staying on Xamarin risks immediate rejection during critical app updates, security vulnerabilities, and unresolvable OS crashes on newer iPhone and Android hardware.
.NET MAUI compiles C# to native ARM64 machine code via Native AOT on iOS and ahead-of-time compilation with startup tracing on Android, rendering real native operating system controls rather than canvas-painted simulations (like Flutter) or JS-to-native bridges (like React Native). Furthermore, for businesses with Microsoft .NET, Azure, or SQL backends, .NET MAUI allows sharing 100% of domain models, validation logic, and EF Core data contracts directly between client and cloud—a massive productivity and maintenance advantage no other framework can offer.
Choose .NET MAUI XAML when your application demands 100% platform-native rendering, highly fluid mobile navigation transitions, custom 60fps gestures, or complex desktop multi-window workflows. Choose .NET MAUI Blazor Hybrid (via BlazorWebView) when you have an existing Blazor web application or web engineering team and want to share 100% of your Razor UI components, forms, and styling across mobile and desktop without sacrificing full access to native device hardware (camera, GPS, biometrics, file system).
Yes. Through our elastic staff augmentation model, you can embed senior .NET MAUI and Xamarin Native engineers led directly by Principal Architect Zeeshan Dad Khan into your team. Our developers plug seamlessly into your Git repositories, CI/CD pipelines, and agile ceremonies, providing senior-level execution without recruiting delays or agency middleman markups.
Direct Principal Consultation
Discuss your architecture, Xamarin migration, or new cross-platform app directly with Principal Architect Zeeshan Dad Khan. We answer all technical inquiries within 24 hours on business days.
Zeeshan Dad Khan
