Senior Security Engineer

Request Technology; United (PA); Remote; USD 100,000 - 150,000; Full time

Job summary

A leading technology company is seeking a Senior Security Engineer to design security test harnesses and integrate fuzzers for vulnerability discovery. This remote role requires strong knowledge in Windows internals and proficiency in C/C++. The ideal candidate will have experience in product security and be able to collaborate on advanced security features.

Qualifications

• Experience in product security or endpoint consulting.
• Strong knowledge of Windows OS internals.
• Proficient in C/C++ and Python.

Responsibilities

• Design and implement security test harnesses to simulate ransomware behavior.
• Develop fuzzers for automated crash and vulnerability discovery.
• Analyze security findings against agent and libraries.

Skills

Hands-on testing of Windows–based agents

Building fuzzers

Automated test harnesses

Strong Windows OS internals knowledge

C/C++ and Python proficiency

Validating security findings

Researching security features

Job description

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)