Senior Product Security Engineer - Remote

Overview

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.

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.

In Short

• Design and implement security test harnesses to simulate real-world ransomware behavior.
• Develop and integrate fuzzers for automated crash and vulnerability discovery.
• Build user-mode hooking instrumentation to explore EDR bypass techniques.
• Triage, reproduce, and analyze security findings against our agent and libraries.
• Perform root-cause analysis on crashes or logic flaws; build PoC exploits or reproducer cases.
• Deep understanding of Windows internals with focus on user-mode security hooks.
• Collaborate on driver-level or API-level integrations when necessary.
• 5+ years in product security or endpoint-focused consulting.
• Experience building fuzzers or integrating existing fuzzing frameworks.
• Strong Windows OS internals knowledge and proficiency in C/C++ and Python.

Requirements

• 5+ years in product security or endpoint-focused consulting.
• Experience building fuzzers or integrating existing fuzzing frameworks.
• Strong Windows OS internals knowledge, especially user-mode hooking.
• Proficient in C/C++ and Python.
• Experience reviewing and validating security findings.
• Comfortable researching and suggesting security features.

Benefits

• Comprehensive healthcare with premiums paid in full for employees and dependents.
• 401k plan with a generous employer contribution.
• Short and long-term disability coverage and life insurance plans.
• Flexible PTO policy.
• Parental leave.
• Generous equity offering.