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# Sr Information Systems Security Engineer

- **Company:** TEKSYSTEMS INC.
- **Location:** Bethesda, MD, United States (Remote available)
- **Experience:** Expert
- **Contract:** Temporary contract
- **Skills:** Microsoft Windows, Systems Engineering, Microsoft Azure, BitLocker Drive Encryption, Cyber Security, Identity and Access Management, Microsoft Office, Zero Trust Network Access, Information Security Management System, Office365, Agentic-AI, Information Technology, Google Gemini, Plan of Action and Milestones
- **Published:** October 5, 2026
- **Apply:** https://www.clearancejobs.com/jobs/9217766/sr-information-systems-security-engineer

## About the Role

DoD CSWF / 8570 certification: IASAE Level II or IAT Level III (e.g., CISSP, CASP+ / SecurityX, CSSLP, CISM).
Computing Environment (CE) & Vendor Certifications: Microsoft Certified: Cybersecurity Architect Expert (SC-100), Microsoft 365 Certified: Security Administrator Associate (SC-200 / MS-500), or Azure Security Engineer Associate (AZ-500).
7-10+ years of experience in cybersecurity engineering, RMF accreditation, eMASS package creation, NIST SP 800-53 security control mapping, and DoD cloud authorization.
Additional Skills and Qualifications

Master's or Bachelor's degree in Cybersecurity, Systems Engineering, Computer Science, or related discipline.

## Description

As the principal cybersecurity engineer and architectural lead, you will be responsible for executing a ground-up rewrite of the Agency's Office 365 Authorization to Operate (ATO) package. You will integrate Zero Trust Architecture principles in alignment with Task 3.2 of the Performance Work Statement (PWS)., Execute a complete rewrite of the Agency's O365 ATO package, developing eMASS-ready Risk Management Framework (RMF) artifacts such as the System Security Plan (SSP), Security Assessment Report (SAR), and Plan of Action and Milestones (POA&M) aligned with DoD Impact Level 4/5 standards.
Utilize Agentic Authoring tools like Google Gemini Workspace to accelerate the analysis of partner academic benchmarks and eMASS baselines, and draft NIST SP 800-53 control descriptions.
Formulate technical justifications for Controlled Unclassified Information (CUI) storage in non-GCC environments, identify compensating controls, and define remediation roadmaps for full GCC-High compliance.
Design, evaluate, and integrate Zero Trust security controls, Identity, Credential, and Access Management (ICAM), disk encryption (BitLocker/FileVault), and continuous monitoring across M365 IL5 tenant and endpoints.
Coordinate with Authorizing Official (AO), Security Control Assessor (SCA), and DISA technical representatives to ensure 100% ATO package acceptance.
Essential Skills