macOS Endpoint Security Engineer

About the role

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.

J ob Description:

About the work

You'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.

Posting text as published by Inabia Software & Consulting.

The evidence behind this listing

Workplace

Remote Employer field

Seniority

Not established

Employment type

contract

Location as listed

United States

Pay and work authorization

Stated pay

Not stated

Visa sponsorship

Not stated

Security clearance

Not established

Citizenship

Not established