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Tech Holding Logo Tech Holding · IT - Software Development

Senior macOS Extension Developer

Mexico · Job Posted March 13, 2026
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Job Description

We are looking for a Senior macOS systems engineer with deep expertise in file system extensions and kernel-adjacent frameworks. You will be responsible for building and maintaining a production-grade sync or virtual drive client on macOS, one that users depend on every day. This is a technically demanding role suited to an engineer who has shipped real software in this space and understands the nuances of Apple's extension model from entitlements to on-demand resource management.

Job Responsibility

  • Design, implement, and maintain macOS File Provider extensions using NSFileProviderExtension and related APIs
  • Integrate and maintain macFUSE-based virtual file systems
  • 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 (async/await, actors, structured concurrency)
  • Diagnose and resolve complex, hard-to-reproduce issues at the intersection of the kernel, file system, and user space
  • Collaborate with product and backend teams to define sync protocols and surface reliable UX

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
  • Practical experience with macFUSE
  • Deep understanding of macOS System Extensions
  • Proficiency with Swift async/await and XPC services for IPC
  • Has shipped a production macOS sync client, cloud drive, backup tool, or similar, that real users depend on

Nice to have

  • Experience with network file system protocols (WebDAV, SMB, NFS) at the application layer
  • Familiarity with FSEvents for file system monitoring
  • Prior experience with Endpoint Security or Network Extension frameworks
  • Contributions to open-source macOS tooling or FUSE projects
  • Background in cloud storage, backup, or enterprise file management products
  • Familiarity with TestFlight distribution and enterprise MDM deployment of system extensions

What we offer

  • Fully remote engagement across MX
  • Opportunity to work on high-impact client systems with real operational ownership
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