Information System Security Enginee...

Guidehouse, a leading firm in cyber consulting, is actively seeking an experienced Information System Security Engineer for our Washington, DC operations. This critical role focuses on establishing and maintaining robust system security boundaries across diverse environments, including hybrid cloud (AWS & Azure CSPs), VMware, and legacy datacenters. You will be instrumental in developing comprehensive authorization packages (SSPs, SARs, POA&Ms) in alignment with NIST RMF. The position involves overseeing continuous monitoring processes using NIST SP 800-137 and OSCAL-based automation to ensure real-time system security posture visibility. Responsibilities include mapping technical controls for inheritance, administering GRC platforms for automated compliance evidence, evaluating network security architectures for TIC 3.0 compliance, and assessing/hardening cloud security configurations. You will collaborate closely with SOC and infrastructure teams for effective vulnerability management, conduct security reviews of proposed changes, provide expert technical analysis during security incidents, act as a liaison with ISSOs, mentor the SOC team, and serve as a key communicator between technical teams, ISSOs, and leadership. Vendor coordination on security requirements is also a key aspect of this role.