Vulnerability Detection Engineer, San Francisco

Looks like a Lisp job, anyway: (C programming is only a plus)

Create signatures for the QualysGuard product to detect vulnerabilities in the areas of Databases, Applications, Operating System, TCP/IP Protocols and network devices. Strong problem solving and troubleshooting skills are a must, as solutions to many problems might not be obvious. A vulnerability detection engineer should also spend a proportion of time keeping up with current vulnerabilities, attacks, and countermeasures.