macOS Endpoint Security Engineer

Inabia Software & Consulting Inc. · United States · $65 – $70 · posted today ago

Apply for this role

engineering security remote jobs in united states

Listing supplied by Himalayas. 101 Careers did not originate this post and applications are handled by the employer.

About this 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.

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.