Senior Cyber Security Engineer Unlock the secrets of intelligence with MANTECH! Join a dynamic team at the forefront of national security, providing advanced solutions to government intelligence agencies. Since 1968, we've been solving the toughest challenges with groundbreaking tech. Explore thrilling projects in Digital Transformation, Cybersecurity, IT, Data Analytics and Software Development. Elevate your career and make a difference. Your adventure begins nowunleash your potential with MANTECH! MANTECH seeks a motivated and mission-focused Senior Cyber Security Engineer to join our team in Herndon, Virginia. In this role, you will contribute to a high-priority mission by designing, implementing, and maintaining secure cloud architectures on AWS and Azure. You will work closely with Solutions Architects, Cloud Engineers, customer stakeholders, and compliance officers to align systems with federal security requirements. This position offers an exciting opportunity for a cybersecurity professional with a strong technical background and hands-on experience supporting secure, classified environments. Responsibilities include but are not limited to: Designing and implementing cybersecurity architectures and controls in compliance with NIST, DoD, and federal civilian guidelines. Managing vulnerability assessment and remediation activities using tools such as Tenable, Qualys, or Nessus. Engineering solutions for endpoint protection, network segmentation, and SIEM integration, including Splunk, Microsoft Sentinel, or ELK Stack. Supporting the full Risk Management Framework (RMF) lifecycle, including system categorization, control selection, implementation, assessment, and continuous monitoring. Configuring and maintaining a suite of security tools including firewalls, IDS/IPS, endpoint protection platforms, and encryption services. Developing and updating comprehensive security documentation, such as System Security Plans (SSPs), Plans of Action and Milestones (POA&Ms), and incident response plans. Collaborating with SOC and government teams to analyze and respond to security incidents. Automating security monitoring, reporting, and compliance validation processes using scripting languages like PowerShell, Python, or Bash. Minimum Qualifications: Bachelor's degree or 4+ additional years of cybersecurity experience in lieu of a degree. 4+ years of experience in cybersecurity roles Demonstrated experience with: NIST SP 800-53 and RMF processes Endpoint Detection & Response (EDR) platforms Firewalls, IDS/IPS, VPNs, and PKI Security automation and scripting Responding to POA&Ms Proven success supporting Authority to Design (ATD), Authority to Operate (ATO), and FedRAMP or FISMA-compliant systems. Strong technical understanding of operating systems (Windows/Linux), network protocols, and cloud platforms (AWS or Azure). Preferred Qualifications: Industry certifications such as CISSP, CEH, GSEC, CASP+, or Security+. Experience with: FedRAMP High environments SCAP compliance tools and STIG implementation SIEM platforms including Splunk, Elastic, or Sentinel Security engineering within CI/CD pipelines (DevSecOps) Familiarity with DoD or IC customer environments and DISA STIGs. Clearance Requirements: US Citizenship required. Must be located within the continental United States with the ability to obtain a security clearance. Physical Requirements: Must be able to remain in a stationary position 50% of the time. 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 presentations. Must be able to exchange accurate information in these situations. MANTECH International Corporation considers all qualified applicants for employment without regard to disability or veteran status or any other status protected under any federal, state, or local law or regulation. If you need a reasonable accommodation to apply for a position with MANTECH, please email us at and provide your name and contact information.