macOS Extension Developer (Contractor) at Tech Holding

, , Mexico -

Full Time

Start Date

Immediate

Expiry Date

27 May, 26

Salary

0.0

Posted On

26 Feb, 26

Experience

5 year(s) or above

Remote Job

Yes

Telecommute

Yes

Sponsor Visa

Skills

macOS Development, File System Extensions, Kernel-Adjacent Frameworks, NSFileProviderExtension, Item Enumeration, On-demand Downloading, Conflict Resolution, macFUSE, FUSE Operations, System Extension Lifecycle, Code Signing, Notarization, Entitlements, Sandboxing, XPC Services, Swift Async/Await

Industry

Software Development

Description

About us: Working at Tech Holding isn't just a job, it's an opportunity to be a part of something bigger. We are a full-service consulting firm that was founded on the premise of delivering predictable outcomes and high-quality solutions to our clients. Our founders and team members have industry experience and have held senior positions in a wide variety of companies – from emerging startups to large Fortune 50 firms – and we have taken our combined experiences and developed a unique approach that is supported by the principles of deep expertise, integrity, transparency, and dependability. The Role 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. Key Responsibilities: Design, implement, and maintain macOS File Provider extensions using NSFileProviderExtension and related APIs Item enumeration, working set management, and placeholder lifecycle On-demand downloading and eviction of file content Conflict detection and resolution strategies Integrate and maintain macFUSE-based virtual file systems Implement low-level FUSE operations: read, write, getattr, readdir, open, 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 (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 Required Skills: 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, NSFileProviderItem, and domain management Item enumeration, on-demand download, and working set eviction Conflict resolution and syncing state machines Practical experience with macFUSE Implementing core FUSE operations: read, write, getattr, open, readdir Handling partial byte-range reads Debugging kernel panics and FUSE-layer failures Deep understanding of macOS System Extensions Code signing and notarization workflows Entitlement management and capability provisioning Sandbox constraints and their impact on file system access 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 Skills: 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. Employment type: Contract Tech Holding is proud to be an Equal Opportunity Employer and is committed to fostering a diverse and inclusive workplace. We welcome applicants from all backgrounds and experiences, and we consider qualified applicants without regard to race, color, religion, gender, sexual orientation, gender identity, national origin, disability, veteran status, or any other legally protected characteristic. If you require accommodation in the application process, please contact our HR

Responsibilities

The role involves designing, implementing, and maintaining a production-grade sync or virtual drive client on macOS, focusing on building and maintaining macOS File Provider extensions using NSFileProviderExtension and related APIs. Key tasks include managing item enumeration, on-demand downloading, conflict resolution, and integrating macFUSE-based virtual file systems.