MANTECH seeks a motivated, career and customer-oriented **Senior Cyber** **Security Engineer** to join our team **onsite** in **Herndon, VA or Reston, VA** to design, implement, and maintain secure environments that align with compliance standards in support of a high-priority mission at one of our National Intelligence Customers. **Responsibilities include but are not limited to:** + Responsible for supporting the acceptance of an Authorization to Operate (ATO) for the new Modern Data Platform (MDP) transformation + Support ISSE/ISSO tasking, including the documentation and navigation of the customer’s accreditation process for ATO + Work closely with Security Engineers to ensure security solutions are meeting customer accreditation requirements and following security controls + Use RMF (Risk Management Framework) NIST 800-53, NISPOM, and ICD for cybersecurity and information security protocols to drive tasking and ensure compliance **Minimum Qualifications:** + Bachelor’s degree in a related field OR additional equivalent work experience + 8+ years of experience relevant to this position, including 4+ years of consulting experience + Team lead or management experience + Expert in System Accreditation process and protocols within the Intelligence Community + Experience with software development lifecycle, application security, Cloud principals and engineering + Experience with NIST 800-53 and implementing Risk Management Framework + Understanding of vulnerability assessment tools like Rapid7 or Nessus + Knowledge of user access monitoring, identity access management and controls. Experience in creating and reviewing system design documents and workflows **Preferred Qualifications:** + Master’s degree in a technical field + Experience with Terraform, SIEM and AI/ML Governance + Knowledge of cross-domain solutions, Zero Trust, and/or IDP (Identity Provider) integration skills + Hands-on experience with security tools such as Splunk or CrowdStrike + Scripting or automation experience (Python, Bash, PowerShell) to support security operations **Clearance Requirements:** + Must have active TS/SCI with Polygraph **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, as well as its subsidiaries proactively fulfills its role as an equal opportunity employer. We do not discriminate against any employee or applicant for employment. All qualified applicants will receive consideration for employment without regard to race, color, religion, sex, sexual orientation, gender identity, national origin, disability, or status as a protected veteran. If you are a qualified individual with a disability and require a reasonable accommodation to apply for a position with ManTech through its online applicant system, please email us at careers@mantech.com and provide your name and contact information.