Senior MacOS Internals Lead Engineer

• 7+ years of systems programming experience with a focus on macOS internals, frameworks, and security.
• Proven track record of delivering complex macOS features to production with hands-on coding in C++, Swift, Objective-C.
• Deep expertise in macOS frameworks, including Endpoint Security, Network Extensions, Accessibility, Launch Services, File Providers, daemons, XPC, and FSEvents.
• Advanced skills in reverse engineering macOS components using tools like Ghidra, Frida, IDA, Hopper, lldb, or other tools of your choice.
• Strong understanding of macOS security mechanisms, including TCC, SIP, Gatekeeper.
• Experience with debugging complex architectures on macOS (system extensions, endpoint security, network extensions, launch services, XPC).
• Ability to produce high-quality, testable, maintainable, and secure code.

Nice to have:

• Expertise with Network Extensions, DriverKit, network protocols, proxies.
• Expertise with APFS, file system internals.
• C# / .Net experience is a plus.

• Design and implement security features using macOS frameworks such as Endpoint Security and Network Extensions.
• Reverse engineer macOS internals and application interactions to enhance product compatibility and security.
• Develop, debug, and optimize complex system-level code in C++, Swift, and Objective-C, adhering to secure coding best practices.
• Investigate and resolve issues related to macOS system extensions, launch services, XPC, and sandboxing.
• Act as a force multiplier by reviewing team designs and code, offering architectural direction, and coaching team members on best practices.
• Document technical findings, architectural designs, and implementation details.
• Collaborate with QA, product, and support teams to ensure high-quality, secure, and testable deliverables.
• Stay updated on macOS updates and security mechanisms in order to inform development.