MacOS Cyber Security Engineer, Endpoint Security (C++/Swift)

Inabia Software & Consulting Inc.; United States; Remote; USD 90,000 - 96,000; Full time

Job summary

Inabia Software & Consulting Inc. seeks a Senior macOS Cyber Security Engineer to work on the CrowdStrike Falcon sensor. The role runs remotely with PST working hours, and pays $65–$70 per hour on a W-2 contract basis.

Responsibilities include developing in C++/Swift, bridging Objective-C++ when needed, and optimizing performance for macOS, Intel and Apple Silicon platforms, with strong emphasis on memory and CPU efficiency.

Qualifications

• Proficiency in modern C++ (C++17/20) and Swift 6 with async/await, actors and concurrency checks.
• Experience bridging Swift and C/C++ via Objective-C++.
• MacOS systems programming including Foundation/CoreFoundation, GCD/pthreads, Mach IPC, launchd, XPC.

Responsibilities

• Develop the macOS sensor for CrowdStrike Falcon on-device security agent.
• Ensure high concurrency, reliability, and optimized memory/CPU usage for the sensor.

Skills

C++17/20

Swift 6

Objective-C++

macOS systems programming

Concurrency and performance

Tools

Xcode

Instruments

LLDB

os_log

Job description

Hello,

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 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.