Senior Developer - CFAPI (Cloud Files API)

Summary: We need a CFAPI specialist, not a general Windows or C# developer.
Responsibilities
Design and develop CFAPI-based sync clients in C# and Windows APIs
Implement Sync Root registration, placeholders, hydration/dehydration, pin/unpin, sync states, and fetch-data/fetch-placeholders callbacks
Integrate with cloud storage and backend services
Handle async operations, concurrency, cancellation and error handling
Troubleshoot sync failures, file locks, hydration and connectivity issues
Optimize performance and reliability, and take part in design, code reviews, testing and production support
Must-Have Skills
7 - 8+ years in software development
Hands-on CFAPI expertise (CfRegisterSyncRoot, CfConnectSyncRoot, CfCreatePlaceholders, CfExecute, CfHydratePlaceholder, CfDehydratePlaceholder, CfSetPinState, CfSetInSyncState)
Proven experience building cloud drive or file sync solutions
Strong C#, P/Invoke and interop
Solid understanding of Windows and NTFS file-system concepts
Strong async programming, multithreading and debugging skills
Good To Have Skills
OneDrive-like app experience
Windows Shell integration
Reparse points, file handles and locking
Windows Services, REST APIs and cloud storage platforms
C++/Win32, WinDbg and Visual Studio debugging
Large-scale Windows client applications
Skills: c#,windows,cfregistersyncroot

Work arrangement
No