Delhi, India · Available worldwide, remote-first

Best Windows Developer — Native Windows C#, .NET Core, and WinUI 3 Desktop Engineering

Sachin Sharma is a premier Windows Developer based in Delhi, India, specializing in native-quality Windows desktop applications (C#, .NET Core, WinUI 3, WPF, Win32 API, Flutter Desktop). With over 1.5+ years of experience in system-level desktop client development, Sachin builds fast, memory-optimized, and secure Windows apps that comply with Microsoft Store policies and runtime sandboxing.

I know you want to build something great with Windows Development.

There are 10 lakh+ agencies, 5 crore+ "vibe coders," and 1 crore+ developers out there — and somehow you ended up on this page. That's not an accident, that's a genuine signal. I'm 21, and if you're on my website right now, you're already looking at someone better than most of what's out there. I'd genuinely prefer to talk to you directly rather than have you read through another page. Please feel free to call, message, or email — whichever works best for you.

Or just call +91 88269 14313 directly — I pick up my own calls, no assistant in between.

Or just see what I've built first

At a Glance

Target OS Platforms

Windows 11, Windows 10 (Build 19041+)

Primary Languages

C#, C++, C++/WinRT

UI Frameworks

WinUI 3 (Windows App SDK), WPF, Windows Forms

Runtime Environment

.NET 8.0, Native AOT (Ahead-of-Time) compilation

Local Persistence

SQLite (Drift), EF Core, Local Folder APIs

Packaging Format

MSIX Installer, Appx, Raw MSI / EXE Setup

Win32 API Access

P/Invoke declarations, Native Windows Hooks

Build System

MSBuild, dotnet CLI pipelines, GitHub Actions

On This Page

~6 min read

1. WinUI 3 & .NET Core Desktop Architectures

2. Native AOT Compilation & .NET Performance Tuning

3. Native Win32 API Integrations (P/Invoke & C++)

4. MSIX Packaging & Microsoft Store Compliance

5. Automated MSBuild & Store Release Pipelines

6. Case Study: Shipped Windows Performance in Loopin & Legease

Sachin Sharma vs. Alternatives

How working with me directly compares to agencies and general freelancers.

Metric	Sachin Sharma	Agencies	Freelancers
Who you talk to	Me, directly. The person writing your code answers your messages.	Account managers and PMs relay your feedback to developers you never meet.	Variable — depends who you find, timezone gaps are common.
What you get	Production apps built end-to-end, not prototypes or tutorial-grade demos.	Junior developers rotated onto your project; senior oversight is inconsistent.	Often strong at scripts and one-off scripts, less so at shipping to production.
Performance work	Real optimization: shader precompilation for 60fps Flutter, Edge SSR under 50ms TTFB, bundle budgets enforced.	Standard boilerplate setup, rarely tuned past 'it works'.	Performance tuning usually skipped unless explicitly (and separately) paid for.
Code ownership	Fully typed, documented codebase. Full git history handed over on day one.	IP clauses and handover friction are common.	Documentation and typing discipline vary a lot person to person.

Frequently Asked Questions

Why should we build a native Windows app in C# WinUI 3 rather than Electron?

Native Windows apps start instantly, use up to 90% less memory, support native window behaviors, and integrate with Windows sandbox security.

What is Native AOT compilation in .NET?

Native AOT compiles your C# code directly into machine code. This removes JIT compiler overhead, providing faster startup times and smaller file sizes.

How do you handle background execution on Windows?

I configure background tasks using Windows App SDK APIs, registering system triggers that execute sync tasks when the user is idle.

Can we share code between WPF and WinUI 3?

Yes. We can share C# business logic and data repositories via .NET Standard class libraries, changing only the XAML layout views.

Do you configure MSIX installation certificates?

Yes. I configure signing certificates for MSIX packaging, allowing users to install the app safely without Windows SmartScreen warnings.

What is the difference between WinUI 3 and WPF?

WPF is Microsoft's legacy UI framework using .NET Framework dependencies, whereas WinUI 3 is the modern fluent UI framework decoupled from the Windows OS.

What is a P/Invoke signature and when do you write it?

A Platform Invoke (P/Invoke) signature allows C# applications to call unmanaged functions exported from native C++ dynamic link libraries (DLLs).

How do you handle local database storage on Windows?

I use SQLite databases with Drift ORM or Entity Framework Core, storing database files securely inside the AppData folder.

What is the Windows App SDK?

The Windows App SDK is a set of APIs and tools that decouple desktop development from the OS, enabling features to run across multiple Windows 10/11 versions.

How do you trace leaks on Windows applications?

I profile memory usage using Visual Studio Diagnostic Tools or JetBrains dotMemory, tracking heap growth and locating reference loops.

How do you package applications for enterprise network deployments?

I compile binaries into MSIX packages, configure signing certificates, and distribute installers using Group Policy Objects (GPO) or Intune.

What is the runFullTrust capability in Windows package manifests?

The `runFullTrust` capability allows sandboxed desktop applications to run with administrator rights, enabling registry access and low-level integrations.

Do you build dark mode support for Windows applications?

Yes. I link UI colors to fluent design tokens, adjusting layouts automatically when system themes change.

What is the difference between C++/WinRT and C# for desktop engineering?

C++/WinRT offers maximum performance and lower memory usage, while C# with .NET Core speeds up development by managing memory and offering extensive libraries.