macOS Extension Developer (macOS)

TL;DR

macOS Extension Developer (macOS): Building and maintaining production-grade sync or virtual drive clients on macOS with an accent on File Provider extensions, macFUSE integration, and System Extension lifecycle management. Focus on diagnosing complex low-level issues at the intersection of the kernel, file system, and user space, and ensuring reliable user experience.

Location: Fully remote engagement across MX.

Company

hirify.global is a full-service consulting firm focused on delivering predictable outcomes and high-quality solutions to clients.

What you will do

• Design, implement, and maintain macOS File Provider extensions, including item enumeration, working set management, and conflict resolution.
• Integrate and maintain macFUSE-based virtual file systems for low-level FUSE operations and large file streaming.
• Manage the full macOS System Extension lifecycle: code signing, notarization, entitlements, and sandboxing requirements.
• Build and maintain secure XPC services for inter-process communication using modern Swift concurrency patterns.
• Diagnose and resolve complex, low-level issues at the intersection of the kernel, file system, and user space.
• Collaborate with product and backend teams to define sync protocols and ensure 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 (NSFileProviderExtension, domain management, conflict resolution).
• Practical experience with macFUSE, including implementing core FUSE operations and debugging kernel panics.
• Deep understanding of macOS System Extensions, including code signing, notarization, entitlements, and sandboxing.
• 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).
• 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.

Culture & Benefits

• Fully remote engagement.
• Opportunity to work on high-impact client systems with real operational ownership.
• Commitment to fostering a diverse and inclusive workplace as an Equal Opportunity Employer.