Staff Security Engineer

MANTECH seeks a motivated, career and customer-oriented Staff Security Engineer to join our team in Chantilly, VA. You will support system security architecture and assurance by helping to implement robust cybersecurity frameworks, assess risk, and support system compliance activities. By leveraging your strong technical background, you will support the improvement and sustainment of mission-driven IT solutions that enable secure enterprise operations. In this role, you will assist architects and system developers in identifying and implementing appropriate information security functionality to ensure consistent application of government security policy. You will perform and review technical security assessments of computing environments to identify vulnerabilities and recommend mitigation strategies. Furthermore, you will evaluate proposed software, hardware, firmware, and infrastructure, including DEVSECOPS, containerization, and zero-trust architectures, to ensure compliance with applicable security guidelines. Responsibilities include but are not limited to: Developing and providing Information Assurance (IA) updates and Assessment and Authorization (A&A) documentation while running Tenable scans and supporting Authority to Operate (ATO) renewalsUsing Splunk to collect weekly CONMONs and updating Plans of Action & Milestones (POA&Ms) to ensure continuous monitoring complianceAssessing and closing allocated controls with Bodies of Evidence (BOEs) and applying required Security Technical Implementation Guides (STIGs)Working with network service providers to develop and maintain robust network architecture diagrams for cyber defense capabilitiesEvaluating and recommending technology upgrades to support performance improvements and alignment with industry best practicesMonitoring and analyzing performance and faults while proposing solutions for system optimization and collaborating with stakeholders to coordinate technical informationSupporting A&A activities related to network security technologies and maintaining a robust library of required documentation Minimum Qualifications: Bachelor’s degree or 4+ years of additional work experience in lieu of a degree2+ years of experience in IT and/or Cyber SecurityIAT Level II certification or higher (Security+, Net+, etc.) or the ability to obtain certification within 6 months of hireExperience creating, maintaining, and communicating complex information technology and security documentationExperience providing ISSE support and working closely with ISSMs and ISSOs to integrate security controls and ensure compliance with RMF and NIST 800-53 standardsExperience identifying security requirements for the proper handling of Government data to ensure systems meet all requirementsExperience with technologies supporting large-scale enterprise deployments or data centers and inventorying complex networks Preferred Qualifications: Experience implementing and supporting complex, multi-component software solutions across a large teamExperience deploying enterprise security software including firewalls, intrusion prevention systems (IPS), and virtualization platformsKnowledge of Windows and Linux systems, TCP/IP networking, 802.1x, and core network security principlesExperience with the Sponsor’s primary cyber risk and compliance automation tools Clearance Requirements: An active TS/SCI with polygraph is required for this position Physical Requirements: Must be able to remain in a stationary position 50%Needs to occasionally move about inside the office to access file cabinets, office machinery, etc.Frequently communicates with co-workers, management, and customers, which may involve delivering presentationsMust be able to exchange accurate information in these situations

Created: 2026-05-05