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Senior

Senior Kernel Engineer

Confirmed live in the last 24 hours

Halcyon

Halcyon

Remote, US
Hybrid
Posted March 18, 2026

Job Description

What we do:
Halcyon is the industry’s first dedicated, adaptive security platform that combines multiple proprietary advanced prevention engines along with AI models focused specifically on stopping ransomware.

Who we are:
Halcyon was formed in 2021 by a team of cyber industry veterans after battling the scourge of ransomware (and advanced threats) for years at some of the largest global security vendors. Comprised of leaders from Cylance (now Blackberry), Accuvant (now Optiv), Fireye and ISS X-Force (now IBM), Halcyon is focused on building products and solutions for mid-market and enterprise customers.

As a remote-native, completely distributed global team, we recognize great talent can exist anywhere. We invite you to apply to a job you’re interested in and we'll work a plan to meet your needs.

The Role:

Halcyon’s goal is to deliver an anti-ransomware solution that breaks new ground as to what an amazing security product can deliver. Aligned with this goal, Halcyon is looking for an experienced Senior Kernel Engineer to contribute to our Windows agent’s ability to prevent, detect, respond, and remediate attacks. In this role, you will drive enhancements in multiple product domains. This development will allow Halcyon’s product to better protect customers from the threat of ransomware.

Responsibilities:

  • Develops prototypes for new features
  • Contributes to functional specifications and project plans for new product features
  • Writes high quality code in the form of new features, bug fixes, and performance enhancements

Skills and Qualifications:

  • Writes high-quality multithread-safe code in C++ in both kernel-mode and user-mode
  • Works independently with little to no direction, and demonstrates solid engineering practices (planning, documentation, unit testing, etc.)
  • Has shipped at least one production quality driver for Windows NT
  • Strong knowledge of Win32 APIs and NT kernel internals
  • Debugs memory corruption issues and improves end-to-end system performance
  • Above average written and verbal communication skills

Bonus skills and Qualifications:

  • Collaborative with an ability and desire to mentor and inspire others
  • Knowledge and experience with Portable Executable format, Reverse Engineering
  • Experience with Windows Mini-Filter drivers and Windows Filter Platform callout drivers
  • Experience with SQL/Databricks and prior experience developing automated telemetry
  • Familiarity with tools for Rust / C++ interoperability

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 3% employer match
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