Senior Product Security Engineer

Halcyon’s goal is to deliver an anti-ransomware solution that breaks new ground in what a security product can achieve. As a Senior Product Security Engineer you will ensure our most innovative defenses make it into every release. These cutting-edge capabilities will keep our customers ahead in the fight against ransomware.

Key responsibilities include endpoint hardening & testing and vulnerability research & triage. You will design and implement security test harnesses from scratch to simulate real-world ransomware behavior. You will also triage, reproduce, and analyze security findings against our agent and libraries.

The position requires 5+ years in product security or endpoint-focused consulting, with hands-on testing of Windows-based agents or EDR / AV products. Also experience building fuzzers or integrating existing fuzzing frameworks for native code. Having strong Windows OS internals knowledge and proficiency in C/C++ and Python are a must.