Senior macOS Cyber Security Engineer – Endpoint Security (C++/Swift)

We are seeking an experienced macOS Cyber Security Engineer to develop and enhance advanced endpoint security solutions. In this role, you will contribute to the development of a high-performance security agent designed to detect, monitor, and prevent malicious activity across macOS devices. You will work extensively with modern C++, Swift, and Objective-C++ while leveraging macOS system-level frameworks and security APIs. The position combines low-level systems programming, cybersecurity engineering, performance optimization, and software reliability. You will collaborate with cross-platform engineering teams to deliver secure, scalable, and efficient solutions. This is an exciting opportunity to work on mission-critical endpoint protection technology in a technically challenging environment.

• 6–10 years of professional software engineering experience, with more experienced candidates also welcome.

• Strong hands-on expertise in modern C++, particularly C++17 or C++20, and proficiency in Swift, including Swift 6, async/await, actors, and strict concurrency.

• Experience with Objective-C++ and integrating Swift, C++, and C APIs.

• Strong knowledge of macOS systems programming, including Foundation, CoreFoundation, Grand Central Dispatch (GCD), pthreads, POSIX/BSD APIs, and Mach IPC.

• Familiarity with launchd daemons and agents, XPC C APIs, and NSXPCConnection.

• Experience using Instruments, os_signpost, LLDB, crash log analysis, and os_log for debugging and performance optimization.

• Knowledge of XCTest, sanitizers, fuzz testing, and xcodebuild-based continuous integration workflows.

• Experience developing and maintaining large, performance-sensitive codebases across multiple operating systems.

• Practical expertise in at least one or more of the following macOS security areas:

  • Endpoint Security and System Extensions: Endpoint Security clients, authorization and notification events, user/MDM approval, and extension upgrades.

  • Network Security: Network Extension content filters, NEFilterDataProvider, NEFilterPacketProvider, and Network.framework.

  • Process Management and IPC: launchd services, daemons, agents, XPC, and interprocess communication.

  • Security and Cryptography: Code-signature verification, certificate validation, Keychain, entitlements, hardened runtime, and macOS privacy permissions.

  • Devices and Storage: IOKit, hardware enumeration, DiskArbitration, and disk or volume event management.

  • Packaging and Deployment: macOS installers, application notarization, and MDM configuration profiles using Jamf, Microsoft Intune, or similar platforms.

• Strong understanding of concurrency, memory management, operating-system internals, and production software reliability.

• Excellent troubleshooting, analytical, and problem-solving skills, with the ability to work independently on complex technical challenges.

• Strong collaboration and communication skills, particularly when working with distributed engineering teams.

• Additional experience with SwiftUI, AppKit, application extensions, macOS beta testing, endpoint detection and response (EDR), antivirus (AV), network security, or device-management products is highly desirable.

• Must be authorized to work in the United States. W2 contract engagement only; F1 OPT candidates are not eligible.

• Must be available to work during Pacific Standard Time (PST) business hours and accommodate prompt interview scheduling.