Senior Security Research Engineer

We're hiring a vulnerability researcher for the Threat Research Unit at Qualys. You'll take vulnerabilities apart to understand exactly how they work, prove out what an attacker could do with them, and turn that into detections and mitigations that hold up on real customer systems. The work sits between offense and defense: writing proof-of-concept exploits to ground your analysis in fact, then using what you learn to build safe, reliable checks and design defenses that make whole classes of bugs harder to exploit.

Responsibilities:

Analyze vulnerabilities down to the affected code path, trigger conditions, the primitive they yield, and what a patch actually changes.

Develop proof-of-concept exploits in the lab to establish reachability, reliability, and real-world impact, giving detection and mitigation work a concrete basis in what an attacker can achieve.

Build non-harmful checks that confirm whether a vulnerability is present on customer hosts. Use a distinguishing signal instead of a harmful payload, and deliver a clear verdict, a response taxonomy, a safety statement, and a false-positive analysis.

Assess mitigation bypasses. Given a vulnerability and a target's defenses (ASLR, DEP/NX, stack canaries, CFI, RELRO, sandboxing, and modern hardware mitigations), determine whether exploitation remains feasible and how.

Design and write stronger mitigations at two levels: killing bug classes and patching individual instances. This includes compiler and platform hardening, defense-in-depth, and design changes that make exploitation economically infeasible even when a bug survives.