Senior MacOS Internals Lead Engineer

Sur Global; Colombia; On-site; COP 412,798,224 - 619,197,336; Full time

Benefits offered by this job

Salary: $10,000 - $15,000 USD/month

Unlimited PTO

Job summary

A leading technology firm in Colombia is seeking a Senior macOS Internals Lead Engineer to drive the development of advanced security functionalities. You will lead a team while engaging in coding and reverse engineering macOS behaviors. Candidates should have over 7 years of systems programming experience and deep knowledge of macOS frameworks. This role offers a competitive salary and benefits, including unlimited PTO.

Qualifications

• 7+ years of systems programming experience with a focus on macOS internals.
• Proven track record of delivering complex macOS features to production with hands-on coding.
• Deep expertise in macOS frameworks, including Endpoint Security and Network Extensions.
• Strong understanding of macOS security mechanisms, including TCC and Gatekeeper.

Responsibilities

• Design and implement security features using macOS frameworks.
• Reverse engineer macOS internals to enhance compatibility and security.
• Develop, debug, and optimize system-level code adhering to secure practices.
• Document technical findings and collaborate with teams for high-quality deliverables.

Skills

macOS internals

C++

Swift

Objective-C

reverse engineering

security features

Tools

Ghidra

Frida

IDA

Hopper

lldb

Job description

We're looking for a Senior macOS 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 macOS application compatibility and harden endpoint security by deeply understanding and integrating with macOS internals. This role is ideal for someone who thrives on technical challenges, understands macOS 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 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