Principal Systems Engineer at Harmonic Security Inc.

As a Principal Systems Engineer at Harmonic Security Inc., you will lead the development of low-level, security-critical endpoint agent software. Operating across Windows, macOS, and Linux, you’ll build high-performance Rust components that monitor and protect data movement. This is a mission-critical role defining how enterprises secure their AI-driven future at the OS level.

• Design and optimize security-critical endpoint agent components in Rust, ensuring reliability across Windows, macOS, and Linux platforms.
• Architect foundational agent systems for signal collection and on-device controls, setting the technical bar for correctness, performance, and safety.
• Work closely with backend and security engineers to bridge low-level system signals with enterprise-grade policy enforcement and real-time observability.

• Strong production experience in Rust or C++, with a deep understanding of memory safety, concurrency, and systems programming fundamentals.
• Proven track record building security-critical client software like EDR, XDR, or DLP agents across multiple operating systems.
• A proactive, AI-first mindset, comfortable using tools like Cursor or Claude to accelerate development and solve complex, low-level technical challenges.

• Build a category-defining product at a $25M Series A startup founded by seasoned cybersecurity leaders who previously built Digital Shadows.
• Work at the cutting edge of AI-first security, writing high-performance Rust code that runs on millions of devices with sub-500ms latency.
• High-impact leadership role reporting to the VP of Engineering, influencing the core architecture and technical direction of the entire endpoint platform.