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

Senior Developer - CFAPI (Cloud Files API)

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