macOS Endpoint Security Engineer
At a glance
Mid-level Security Engineering role at Inabia Software & Consulting. Remote · contract.
Pay not stated Security Engineer salary
remoteroles summary, based on the employer's posting.
What you'll do
- Build the macOS sensor that watches file, process, network and identity activity, blocks threats and sends telemetry to the cloud
- Keep the user-space System Extension reliable under concurrency while limiting CPU and memory use
- Work in code shared across macOS, Windows and Linux, using C++, Swift and Objective-C++
- Profile and debug the sensor, then test changes with the listed macOS tools and CI methods
What you bring
- You have six to ten years in the field; more senior experience may also be considered
- You can develop in modern C++, Swift 6 and Objective-C++
- You bring macOS systems-programming experience with APIs such as Foundation, POSIX/BSD, Mach IPC and XPC
- You have expertise in at least one listed area, such as Endpoint Security, Network Extension, security and crypto, or device and storage APIs
Who this fits
This is a contract role for a hands-on macOS security engineer. You must be a U.S. citizen or Green Card holder and work Pacific Time hours.
From the employer
Role: Senior macOS Cyber Security Engineer, Endpoint Security (C++/Swift)
Location: Remote (PST working hours)
Client: Accenture/Amazon
Work Authorization: U.S. Citizen (USC) or Green Card (GC) holders only
Requirement Type: Contractual
Experience: 6-10 years, we can evaluate more senior as well but need to build a pyramid.
W-2 Rate: $65 - $70/hr.Job Description:
About the workYou'll work on the macOS sensor for CrowdStrike Falcon, an on-device security agent. It monitors file, process, network and identity activity, blocks malicious behavior, and streams telemetry to the cloud. The sensor runs entirely in user space as a System Extension. Much of the code is shared with Windows and Linux. The work requires high concurrency, high reliability, careful attention to memory & CPU usage and performance.
Required
· Languages: modern C++ (C++17/20) and Swift 6 (async/await, actors, strict concurrency checking). Also Objective-C++ to bridge Swift, C++ and C APIs.
· macOS systems programming: Foundation and CoreFoundation, GCD and pthreads, POSIX/BSD APIs, Mach IPC, launchd daemons and agents, and XPC (C API and NSXPCConnection).
· Performance, debugging and test:
o Profiling CPU and memory with Instruments and os_signpost.
o Debugging with LLDB, crash logs and os_log.
o XCTest, sanitizers, fuzzing, and xcodebuild-based CI.
o Apple Silicon and Intel.
· Experience with codebases shared across Mac, Windows and Linux.
Core skills (one or more of the areas listed below)
· Process model and IPC: launchd daemons and agents, and XPC (C API and NSXPCConnection).
· Endpoint Security and System Extensions: Endpoint Security clients handling both blocking (AUTH) events and notification events, user/MDM approval, upgrades.
· Network Extension: content filters, both flow-level (NEFilterDataProvider) and packet-level (NEFilterPacketProvider), and Network.framework.
· Security and crypto: Verifying code signatures (SecCode / SecStaticCode) and validating certificates (SecTrust), Keychain, Entitlements, hardened runtime, and macOS privacy permissions.
· Devices and storage: IOKit (hardware and device enumeration) and DiskArbitration (disk and volume events).
· Packaging and deployment: installers, notarization, and MDM configuration profiles deployed through Jamf, Intune or similar tools.
· Performance, debugging and test: Profiling CPU and memory with Instruments and os_signpost, Debugging with LLDB, crash logs and os_log, XCTest, sanitizers, fuzzing, and xcodebuild-based CI.
Nice to have
· UI: SwiftUI and AppKit apps and app extensions.
· Testing against macOS and Xcode betas before public release.
· Experience shipping EDR/AV, network security or device-management products.
Security Engineering work from LinkedIn, X, Reddit and Upwork, in one list.
Each morning you get everything that fits, strongest first.
Security EngineeringRemote
Find me workBy the team behind remoteroles.