Software Engineer II & Senior Software Engineer

Attacks begin on the endpoint—it’s where an intruder first lands, runs malware, and moves laterally across a network. It’s also where their activity can be observed most clearly in real time. The Microsoft Defender for Endpoint (MDE) client for macOS runs directly on our enterprise customers’ Macs, continuously monitoring processes, files, and system events. It blocks threats on the device and transforms what it observes into high-fidelity signals that power investigation and response across Microsoft Security. Operating across diverse macOS versions and large enterprise fleets—without negatively impacting device performance—is a complex systems challenge. The agent runs close to the operating system using system extensions and the Endpoint Security Framework, integrating deeply with the macOS security model to extend and enhance the protections our customers already rely on. We are looking for a Software Engineer II and a Senior Software Engineer who are passionate about building fast, reliable, native systems software and want to shape a macOS product that protects enterprise environments against real-world attacks. Our team's engineers have the opportunity to influence technical direction, own the architecture of major features and subsystems, and elevate the engineers around them.