Staff Domain Engineer

About the Role

Halcyon’s goal is to deliver an anti-ransomware solution that breaks new ground as to what a security product can deliver. Aligned with this goal, Halcyon is looking for a Domain Staff Engineer to help ensure innovative capabilities make it into delivered product. These innovative capabilities will ensure that Halcyon’s customers' are at the forefront of the fight against the threat of ransomware.

To this end, we are seeking a Domain Staff Engineer to bridge the gap between Security Research and Engineering in the development of new security features that enhance our ransomware protection, detection, and remediation capabilities. This role sits within Security Research, reporting to the VP of Research, and takes innovative security ideas and works closely with the engineering team to collaborate on proofs-of-concept, architectures, solutions, and mechanisms to make the ideas reality.

Key Responsibilities

• PoC Development & Engineering Collaboration

  • Assist or lead the development of initial stage product capabilities that measure and/or demonstrate the feasibility of new protections.

  • Work closely with agent, kernel, and cloud engineering teams to ensure approaches align with real-world constraints and implementation strategies.

  • Learn from Engineering’s technology stack and patterns to improve future approaches to implementation, making them more aligned with production realities.

• Process Improvement & Integration

  • Advocate for security solution ideas, ensuring they are well-documented, technically validated, and ready for Engineering adoption.

  • Drive and refine the processes by which new product capabilities transition into Engineering for full productization.

• Technical Strategy & Cross-Team Collaboration

  • Act as a facilitator between Security Research and Engineering, ensuring that product innovations are seamlessly integrated into Engineering workflows.

  • Ensure that product innovations are designed to scale and integrate well within existing engineering frameworks.

Required Technical Skills

• Expertise in Windows low-level security development, including experience with kernel-mode and user-mode security mechanisms.

• Strong proficiency in Rust, C, and C++, with experience working with the Windows API.

• Experience developing security defenses, particularly against ransomware and malware threats.

• Strong understanding of systems and software engineering best practices, including performance, maintainability, and security considerations.

Required Communication Skills

• Ability to bridge the gap between research and engineering, bringing ideas closer to production feasibility.

• Experience working with cross-functional teams, including cloud, agent, and kernel engineering teams.

• Excellent interpersonal skills—able to document, present, and advocate for security solutions within Engineering and Product teams.

Why Join Us?

• Play a critical role in developing cutting-edge ransomware protections and security features that will have a real-world impact.

• Work alongside highly skilled security researchers and engineering teams building next-generation security solutions.

• Have the opportunity to shape the process by which security innovations transition from research into real-world implementations.

• Be part of a company deeply committed to stopping ransomware and protecting customers.

Benefits:

Halcyon offers the following benefits to eligible employees:

• Comprehensive healthcare (medical, dental, and vision) with premiums paid in full for employees and dependents.

• 401k plan with a generous employer contribution.

• Short and long-term disability coverage, basic life and AD&D insurance plans.

• Medical and dependent care FSA options.

• Flexible PTO policy.

• Parental leave.

• Generous equity offering.

The Company reserves the right to modify or change these benefits programs at any time, with or without notice.​

Base Salary Range: $240,000 - $275,000

Bonus Target: 10%