Senior MacOS Internals Lead Engineer

Sur

England, United Kingdom Remote permanent

Posted: March 16, 2026

Quick Summary

As a Senior MacOS Internals Lead Engineer, you will drive the development of low-level security and compatibility functionality. You will design and implement security features using macOS frameworks such as Endpoint Security and Network Extensions, and work closely with a team of engineers to enhance product compatibility and security.

Required Skills

Job Description

As a Senior macOS Internals Lead Engineer you will drive the development of low-level security and compatibility functionality. You will lead a team of exceptional engineers while remaining deeply hands-on-writing code, reverse engineering OS behavior, and directly owning key system-level components.

What You Will Do:

• 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.

Requirements:
• 7+ years of systems programming experience with a focus on macOS internals, frameworks, and security
• Proven track record of delivering complex macOS features to productions 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. You’re not afraid to look at XNU sources.
• 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.

Benefits:
Salary: $10,000 - $15,000 USD /month + Holidays

Unlimited PTO

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