**MANTECH** seeks a motivated, career and customer-oriented **Senior** **Information Systems Security Engineer (ISSE)** to join our team in **Washington, D.C.** This is an **onsite** position.

The Information Systems Security Engineer (ISSE) will leverage their strong technical background and knowledge to support accreditation efforts, to include responding to/implementing/documenting required controls, and completing required tasks/actions.

**Responsibilities include but are not limited to:**

+ Designing secure architectures, hardware, operating systems, and software applications to ensure cybersecurity requirements are adequately addressed for the IS and Network Environment.
+ Designing, developing, and implementing network security measures and specific countermeasures that provide confidentiality, integrity, availability, authentication, and non-repudiation.
+ Integrating and implementing security protocols with Cross Domain Solutions (CDS)...