MAC OS Engineer

Cloud Integrator Inc; United States; On-site; USD 120,000 - 170,000; Full time

Benefits offered by this job

SwiftUI experience

AppKit apps and extensions

EDR/AV security project exposure

Job summary

Cloud Integrator Inc. seeks a skilled macOS systems programmer to design and implement low-level components using launchd, XPC, and Endpoint Security. You will work across Apple frameworks, ensure secure code signing and hardened runtimes, and contribute to cross-platform tooling.

Responsibilities include performance profiling, debugging with LLDB, and collaborating on CI pipelines, notarization, and MDM deployments for macOS environments.

Qualifications

• Proficiency in macOS systems programming including IPC with launchd and XPC.
• Strong knowledge of Endpoint Security clients and MDM workflows.
• Experience with Network Extension and System Extensions APIs.
• Expertise in code signing, entitlements, hardened runtime and macOS privacy permissions.
• Familiarity with IOKit and DiskArbitration APIs and Apple deployment tooling.

Skills

Launchd daemons

XPC/ NSXPCConnection

Endpoint Security

Network Extension

Security & crypto

Code signing

Keychain

Hardening

IOKit

DiskArbitration

Notarization

MDM deployment (Jamf/Intune)

Profiling & performance

LLDB debugging

XCTest & CI

Tools

Xcode

Instruments

LLDB

Jamf

Intune

NetworkExtension framework

Job description

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

• 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.