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Senior MacOS Internals Lead Engineer

Sur | Ukraine, Ukraine | Posted June 01, 2026

Position Overview

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:

  1. Design and implement security features using macOS frameworks such as Endpoint Security and Network Extensions.
  2. Reverse engineer macOS internals and application interactions to enhance product compatibility and security.
  3. Develop, debug, and optimize complex system-level code in C++, Swift, and Objective-C, adhering to secure coding best practices.
  4. Investigate and resolve issues related to macOS system extensions, launch services, XPC, and sandboxing.
  5. Act as a force multiplier by reviewing team designs and code, offering architectural direction, and coaching team members on best practices.
  6. Document technical fin...

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