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Senior macOS Extension Developer (Contractor)

1 day, 21 hours ago
Mexico
Contract
Senior
Software Engineer
Software Development
macOS Swift
Apply Now
Tech Holding

Tech Holding

Tech Holding: California's #1 website design company offering full-service technology consulting with expertise in software management, AI, and security.

Internet Software & Services
51-250
Founded 2016
View All Jobs 17

Description

  • Design, implement, and maintain macOS File Provider extensions using NSFileProviderExtension and related APIs.
  • Manage item enumeration, working set state, placeholder lifecycle, on-demand downloads, eviction, and conflict resolution.
  • Integrate and maintain macFUSE-based virtual file systems.
  • Implement low-level FUSE operations such as read, write, getattr, readdir, open, and release.
  • Handle partial byte-range reads for large-file streaming scenarios.
  • Manage macOS System Extension lifecycle, including code signing, notarization, entitlements, and sandboxing requirements.
  • Build and maintain XPC services for secure inter-process communication between the extension and host app.
  • Write idiomatic Swift using modern concurrency patterns such as async/await, actors, and structured concurrency.
  • Diagnose and resolve complex issues at the intersection of the kernel, file system, and user space.
  • Collaborate with product and backend teams to define sync protocols and deliver a reliable user experience.

Requirements

  • 5+ years of macOS development experience, with a focus on system-level or framework-level work.
  • Strong hands-on experience with the FileProvider framework, including NSFileProviderExtension, NSFileProviderItem, and domain management.
  • Experience with item enumeration, on-demand download, working set eviction, conflict resolution, and syncing state machines.
  • Practical experience with macFUSE, including implementing core FUSE operations and handling partial byte-range reads.
  • Experience debugging kernel panics and FUSE-layer failures.
  • Deep understanding of macOS System Extensions, including code signing, notarization, entitlements, and sandbox constraints.
  • Proficiency with Swift async/await and XPC services for IPC.
  • Experience shipping a production macOS sync client, cloud drive, backup tool, or similar product used by real users.
  • Experience with network file system protocols such as WebDAV, SMB, or NFS at the application layer (nice to have).
  • Familiarity with FSEvents, Endpoint Security, Network Extension, TestFlight, or enterprise MDM deployment of system extensions (nice to have).

Benefits

  • Fully remote engagement across Mexico.
  • Opportunity to work on high-impact client systems with real operational ownership.
  • Contract employment.
  • Equal Opportunity Employer commitment with an inclusive hiring process.

Interested in this position?

Apply directly on the company website

Apply Now

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