Demo

Staff Engineer, Endpoint Agent

halcyon
San Francisco, CA Full Time
POSTED ON 10/2/2025
AVAILABLE BEFORE 12/2/2025

The Role:

Halcyon is redefining what security software can do, with a focus on anti-ransomware innovation. We're seeking a Staff Engineer to help lead the design and development of our cross-platform endpoint agent. This role is instrumental in shaping both the technical architecture and future direction of our Windows, Linux, and macOS protection capabilities.

Responsibilities:

  • Own the technical vision and architecture of Halcyon’s cross-platform endpoint agent, covering user-space services, kernel drivers, and tooling

  • Collaborate with cross-functional teams including researchers, product managers, and engineers to design and implement cutting-edge anti-ransomware features

  • Lead complex, cross-platform engineering efforts, balancing performance, scalability, and security

  • Mentor and support the growth of engineers across the endpoint team

  • Troubleshoot and resolve complex, high-impact technical issues during feature development

  • Define, implement, and improve engineering processes and standards across the team

  • Champion technical excellence and product quality, advocating for best practices in all aspects of development

Skills and Qualifications:

  • Experience developing high-quality code in Rust (preferred) or C

  • Proven track record developing endpoint security products

  • Experience in a staff-level or principal engineering role, with a focus on architecture and cross-team collaboration

  • Expert-level knowledge in low-level systems, including kernel or driver development on Windows, Linux, or macOS

  • Strong written and verbal communication skills, with the ability to influence technical and non-technical stakeholders

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