Senior macOS Cyber Security Engineer, Endpoint Security (C++/Swift)

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 Crowd. Strike 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 Core.

Foundation, 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 (NEFilter. Data. Provider) and packet-level (NEFilter. Packet. Provider), and Network.framework.· Security and crypto: Verifying code signatures (Sec. Code / Sec. Static. Code) and validating certificates (Sec. Trust), Keychain, Entitlements, hardened runtime, and macOS privacy permissions.

· Devices and storage: IOKit (hardware and device enumeration) and Disk. Arbitration (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 App. Kit apps and app extensions.· Testing against macOS and Xcode betas before public release.· Experience shipping EDR/AV, network security or device-management products.