Software Engineer (Endpoint Systems)

Job description

**This is a direct hire position for our client located in Seattle, Washington. U.S. work authorization is required; no sponsorship is available.** We’re looking for a Software Engineer (Endpoint Systems) with strong experience building endpoint-native software across macOS, Windows, and/or Linux, plus a solid understanding of the workstation networking stack . You’ll help build core components of a runtime layer that lives between the OS and user-space applications, capturing and shaping network and system behavior in real time. Responsibilities: Build and maintain cross-platform endpoint applications (macOS, Windows, Linux) Develop systems that intercept, analyze, and control network and application behavior Perform low-level systems work (e.g., macOS Network Extension, Windows/Linux equivalents) Work close to the OS layer (user-space, system APIs, possibly kernel-adjacent components) Implement logic for policy enforcement, traffic inspection, and action gating Collaborate with security, AI, and infrastructure engineers to understand agent workflows and risks Optimize for performance, reliability, and low-latency interception Required Qualifications: Core Requirements: 3–6 years...