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*We are unable to sponsor for this permanent Full time role* *Position is bonus eligible* Prestigious Enterprise Security Services Company is currently seeking a Senior Ransomware Security Product Engineer. Candidate will analyze ransomware samples and threat actor tools to gain insights for future product features, threat actor insights, and assist in the validation of our current capabilities. The ideal candidate will be a proficient reverse engineer with experience in analysing malware, have a strong understanding of cryptography used in ransomware, and the ability to develop tools to augment existing capabilities. Key Responsibilities Endpoint Hardening & Testing 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 Vulnerability Research & Triage 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 Platform Expertise 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) Qualifications: 5+ years in 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 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

*We are unable to sponsor as this is a permanent Full time role* A prestigious company is looking for a Senior Product Security Engineer. This role is focused on reverse engineering, analysing malware, ransomware, ability to develop tools to augment existing capabilities, etc. 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) Qualifications 5+ years in 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 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

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)