Windows Cloud Sync Engineer

This is a remote position. Job Role:Windows Cloud Sync Engineer Experience: 6+ Years Location: Remote Notice Period: Immediate Joiner Platform: Windows Desktop Technology Stack: C++20, C++/CLI, .NET 8.0, Win32, Cloud Filter API Development Environment: Visual Studio 2022, Windows SDK 10.0 Target OS: Windows 10 and above About the Role We are building a high-performance Windows desktop application that seamlessly synchronizes customer files from the Cloud directly into Windows File Explorer. This role focuses on developing a robust cloud sync engine using native C++, creating a C++/CLI interop layer to integrate with a .NET 8.0 application, and implementing deep Windows File Explorer integration using the Windows Cloud Filter API. The ideal candidate has strong Windows systems programming expertise, modern C++ proficiency, and experience building production-grade desktop software optimized for performance, reliability, and maintainability. Key Responsibilities Design and implement a cloud file synchronization engine for Windows Build and maintain a C++/CLI mixed-mode interop layer between native C++ and .NET 8.0 Integrate deeply with Windows File Explorer using the Cloud Filter API (cfapi.h) Implement file system callbacks, sync root registration, and on-demand file hydration Develop multi-threaded, asynchronous components optimized for performance and stability Work across managed and unmanaged boundaries to debug and resolve complex issues Collaborate with .NET developers to deliver a seamless desktop experience Ensure production-quality code with a focus on reliability, security, and maintainability Must-Have Qualifications Cloud Sync Engine Development Hands-on experience with Windows Cloud Filter API (cfapi.h) or similar OS-level file sync technologies Strong understanding of: Sync root registration Placeholder file states On-demand hydration patterns Experience implementing native file system callback handlers Modern C++ (C++20) 5+ years of professional native C++ development on Windows Strong expertise in modern C++ features: std::variant, std::optional, std::string_view Lambdas, std::function, functional programming patterns Template metaprogramming and variadic templates Deep understanding of memory management, RAII, and pointer safety C++/CLI Interoperability Experience developing C++/CLI mixed-mode assemblies targeting .NET Core / .NET 8.0 Ability to design ref class wrappers exposing native C++ functionality to managed code Strong understanding of managed vs unmanaged compilation boundaries Experience with string marshaling between std::wstring and System::String^ Windows Systems Programming Strong knowledge of Win32 API, Windows Shell APIs, and File System APIs Proven experience in multi-threaded programming: Thread pools and work scheduling Synchronization primitives (std::mutex, std::shared_mutex, reader-writer locks) Async and callback-based architectures Familiarity with Windows SDK 10.0 and Windows 10+ targeting COM Programming Experience implementing COM components: IUnknown, reference counting, class factories Knowledge of DLL exports: DllGetClassObject, DllRegisterServer, DllUnregisterServer Understanding of registry-based COM registration Build Systems & Tooling Proficiency with Visual Studio 2022 for mixed C++/C# solutions Experience with MSBuild and .vcxproj configuration Strong debugging skills across managed and unmanaged code Nice-to-Have Qualifications Windows Shell Extensions Experience building shell extensions such as: Context menu handlers (IContextMenu, IShellExtInit) Icon overlay handlers Property handlers Knowledge of Windows Explorer integration patterns .NET Desktop Development Experience with .NET 8.0 WPF desktop applications Familiarity with MVVM architecture and data binding Ability to contribute to C# codebases when required Database & Serialization Experience using SQLite via the C API Familiarity with nlohmann/json or similar C++ JSON libraries Installer & Deployment Experience with NSIS installer scripting Knowledge of WiX Toolset v4 for MSI creation Understanding of enterprise-grade Windows installer best practices CI/CD & Testing Experience with GitHub Actions for Windows CI pipelines Familiarity with testing strategies in mixed C++/.NET environments Experience with unit, integration, and end-to-end testing Security & Authentication Experience with Windows Credential Manager Understanding of OAuth 2.0 authentication flows in desktop applications Knowledge of Windows security models and file system permissions Logging & Observability Experience with structured logging (ECS / Elastic Common Schema) Familiarity with centralized logging solutions such as Elasticsearch Bonus Points Prior experience building cloud sync clients (e.g., OneDrive, Dropbox, Google Drive-style architectures) Experience with chunked or resumable file upload and download mechanisms

5+ years
C++/CLI ,.NET 8.0, Win32, Cloud Filter API