We're looking for a Senior mac OS Internals Lead Engineer to 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.Your team's mission is to expand mac OS application compatibility and harden endpoint security by deeply understanding and integrating with mac OS internals.
This role is idóneo for someone who thrives on technical challenges, understands mac OS at a deep level, is not afraid of reverse engineering and can mentor others while shipping production code.What You Will Do:Design and implement security features using mac OS frameworks such as Endpoint Security and Network ExtensionsReverse engineer mac OS internals and application interactions to enhance product compatibility and securityDevelop, debug, and optimize complex system-level code in C++, Swift, and Objective-C, adhering to secure coding best practicesInvestigate and resolve issues related to mac OS system extensions, launch services, XPC, and sandboxingAct as a force multiplier by reviewing team designs and code, offering architectural direction, and coaching team members on best practicesDocument technical findings, architectural designs, and implementation detailsCollaborate with QA, product,



and support teams to ensure high-quality, secure, and testable deliverablesStay updated on mac OS updates and security mechanisms in order to inform developmentRequirements:7+ years of systems programming experience with a focus on mac OS internals, frameworks, and securityProven track record of delivering complex mac OS features to productions with hands on coding in C++, Swift, Objective-CDeep expertise in mac OS frameworks, including Endpoint Security, Network Extensions, Accessibility, Launch Services, File Providers, daemons, XPC and FSEventsAdvanced skills in reverse engineering Mac OS components using tools like Ghidra, Frida, IDA, Hopper, lldb or other tools of your choice.
You're not afraid to look at XNU sourcesStrong understanding of mac OS security mechanisms, including TCC, SIP, GatekeeperExperience with debugging complex architectures on Mac OS (system extensions, endpoint security, network extensions, launch services, XPC)Ability to produce high-quality, testable, maintainable and secure codeNice to have:Expertise with Network Extensions, Driver Kit, network protocols, proxiesExpertise with APFS, file system internalsC# /.
Net experience is a plusBenefits:
Salary: $10,000 - $15,000 USD /month + HolidaysUnlimited PTO

📌 Senior Macos Internals Lead Engineer (Heroica Puebla de Zaragoza)
🏢 Sur Global
📍 Heroica Puebla de Zaragoza