Senior Security Engineer
Salary: Open + Bonus + Stock Options
Location: Remote
*We are unable to provide sponsorship for this role*
Qualifications
Product security or endpoint-focused consulting, with hands-on testing of Windows-based agents or EDR/AV products Experience building fuzzers or integrating existing fuzzing frameworks for native code Experience and capability in building automated test harnesses from the ground up Strong Windows OS internals knowledge, especially user-mode hooking and Win32 API behaviors Proficient in C/C++ and Python, with solid experience calling with Windows APIs Experience reviewing and validating security findings Comfortable researching and suggesting security features end-to-end and creating technical content
Preferred
Rust development experience, particularly around FFI or unsafe code Published tooling or research in vulnerability discovery, fuzzing, and/or automated test frameworks Hands-on experience with CI platforms (GitHub Actions, Jenkins) to automate security workflows
Responsibilities
Design and implement security test harnesses from scratch to simulate real-world ransomware behavior Develop and integrate fuzzers (libFuzzer, AFL/WinAFL, or custom tools) for automated crash and vulnerability discovery Build user-mode hooking instrumentation and explore EDR bypass techniques to exercise agent internals Triage, reproduce, and analyze security findings against our agent and libraries Perform root-cause analysis on crashes or logic flaws; build minimal PoC exploits or reproducer cases Deep understanding of Windows internals (ring transitions, memory management, Win32 API) with focus on user-mode security hooks Collaborate on driver-level or API-level integrations when necessary (no Kernel-driver dev required)
