Security Software Engineer

ManpowerGroup; Austin (TX); Remote; USD 150,000 - 190,000; Full time

Benefits offered by this job

Remote work (PST hours)

Work on CrowdStrike Falcon sensor

Competitive compensation

Job summary

ManpowerGroup is recruiting for a senior macOS systems programmer to join the team working on the CrowdStrike Falcon sensor. You’ll develop in user-space as a System Extension, focusing on high concurrency, performance, and low memory footprint across Apple platforms.

The role requires deep knowledge of C++17/20, Swift 6, Objective-C++, and macOS IPC mechanisms, with experience across macOS Foundation/CoreFoundation, GCD, XPC, launchd and related APIs. Remote work with PST hours is offered.

Qualifications

• 7-10 years of experience in software development (seniority considered)
• macOS systems programming experience required
• Proficiency in modern C++ and Swift 6 with concurrency features
• Experience bridging Swift, C++, and C via Objective-C++
• Familiarity with macOS IPC mechanisms and related APIs

Responsibilities

• Develop macOS sensor code for CrowdStrike Falcon as a user-space System Extension
• Ensure high concurrency, reliability, and efficient memory/CPU usage
• Collaborate across Mac, Windows and Linux codebases to share components

Skills

C++17/20

Swift 6

Objective-C++

Tools

Foundation/CoreFoundation

GCD

POSIX/BSD APIs

Mach IPC

launchd

XPC

Job description

Experience : 7-10 years, we can evaluate more senior as well but need to build a pyramid.

Location: Remote (PST working hours)

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:
• Profiling CPU and memory with Instruments and os_signpost.
• Debugging with LLDB, crash logs and os_log.
• XCTest, sanitizers, fuzzing, and xcodebuild-based CI.
• 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

ManpowerGroup is committed to providing equal employment opportunities in a professional, high quality work environment. It is the policy of ManpowerGroup and all of its subsidiaries to recruit, train, promote, transfer, pay and take all employment actions without regard to an employee's race, color, national origin, ancestry, sex, sexual orientation, gender identity, genetic information, religion, age, disability, protected veteran status, or any other basis protected by applicable law.