Parsons Transportation Group is hiring a Senior System Security Engineer

Parsons Transportation Group is hiring a Senior System Security Engineer to act as the technical Subject Matter Expert for Risk Management Framework (RMF) assessments and authorization strategies. This position is part of our Federal Solutions team and is primarily on-site, with some remote flexibility for planning and documentation tasks.

What You'll Do

• Serve as technical SME for RMF-based cybersecurity assessments and system authorization strategies.
• Develop and update RMF artifacts including System Security Plans (SSPs), Security Control Traceability Matrices (SCTMs), Configuration Management Plans, Incident Response Plans, Continuous Monitoring (CONMON) Plans, POA&Ms, and Security Assessment Reports (SARs).
• Support IATT, ATC, and ATO processes, working with internal engineering teams and external Authorizing Officials (AOs).
• Perform system-level security control assessments (NIST SP 800-53) and validate security posture.
• Evaluate external connection risks and support ATC approval processes with boundary defense and enclave protections.
• Support vulnerability and compliance scans using tools such as ACAS, Tenable Security Center, STIG Viewer, and Evaluate STIG.
• Collaborate with development and infrastructure teams to define, validate, and maintain secure configurations and baselines.
• Maintain and update continuous monitoring (CONMON) processes, collect metrics, track findings, and coordinate with ISSMs and stakeholders.
• Draft and maintain cyber documentation required for accreditation package submission.
• Assist in security impact analyses for configuration changes, new software deployments, or system modifications.

What We're Looking For

• Active Secret Clearance.
• Bachelor’s degree in Software, Computer, Systems, Electrical, Information Technology Engineering, or a related technical field (additional years of experience can count in lieu of degree).
• 8+ years of related experience.
• CompTIA Sec+ certification.
• Experience with RMF-based cybersecurity assessments.
• Experience supporting IATT, ATO, or ATC approval efforts.
• Strong understanding of DoD and NIST cybersecurity frameworks and controls.

Nice to Have

• Cybersecurity certifications such as CompTIA CASP+, CISSP, OSCP, CISM, CEH, or GSEC.
• System administration experience with Linux.
• Network switch and router administration experience or network engineering experience.
• Experience with VMware.
• Experience with Kubernetes and Docker.

Technical Stack

• ACAS, Tenable Security Center, STIG Viewer, Evaluate STIG
• Linux, VMware, Kubernetes, Docker

Team & Environment

You will be part of the Federal Solutions team at Parsons.

Benefits & Compensation

• Salary range: $108,700.00 - $190,200.00
• Medical, Dental, and Vision coverage
• Paid time off
• 401(k)
• Life insurance
• Flexible work schedules
• Paid holidays

Work Mode

This position is primarily on-site with some remote work opportunities for planning and documentation.

Parsons is an equal opportunity employer, and all qualified applicants will receive consideration for employment without regard to race, color, religion, sex, national origin, disability, veteran status or any other protected status.