Senior macOS Cyber Security Engineer, Endpoint Security (C++/Swift)
- Remote
- Senior Level
- 6+ years
- Posted
Skills
Required
- C++
- Swift
- C API
- debugging
- CPU
- launchd daemons and agents
- XPC
- NSXPCConnection
- Profiling
- Windows
- Linux
- pthreads
- Keychain
Preferred
- macOS
- UI
- SwiftUI
- AppKit
- Xcode
- EDR/AV / network security / device-management
Hello, Role: Senior macOS Cyber Security Engineer, Endpoint Security (C++/Swift)
About inabia
Client: Accenture/Amazon
Responsibilities
- Location: Remote (PST working hours)
Requirements
- Work Authorization: U.S. Citizen (USC) or Green Card (GC) holders only
- Experience: 6-10 years, we can evaluate more senior as well but need to build a pyramid.
- 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.
- 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.
Preferred
- 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.
Pay
W-2 Rate: $65 - $70/hr.