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Mantis Security

Cybersecurity consulting and zero-trust architecture services

Information Systems Security Officer

Full-TimeUpdated on 10/23/2026
No salary listed
Expert
Bachelor's, Master's
Reston, VA, USA
In Person
CybersecuritySecurity Governance, Risk & Compliance
No H1B Sponsorship
US Top Secret Clearance Required

About the job

Requirements
  • A Bachelor's degree with 9 years of experience, a Master's degree with 7 years of experience, or no degree with 13 years of experience is required.
  • DoD 8570 IAT Level II certification is required, with one of the following: CCNA Security, CySA+, GICSP, GSEC, Security+ CE, or SSCP.
  • Current TS/SCI eligibility or active TS/SCI is required.
  • Must be able to obtain a CI polygraph.
Responsibilities
  • Support Assessment and Authorization (A&A) and Risk Management Framework (RMF) processes, including ICD 503, CNSSI-1253, NIST 800-37, and NIST 800-53, for multiple information systems.
  • Review associated security documentation for validity and accuracy.
  • Create and maintain the System Security Plan (SSP), Security CONOPS, Security Test Plan (STP), and Security Test Procedures; document and maintain implementation details of NIST 800-53 security controls.
  • Plan and perform security functional testing, create and maintain STPs, and support security assessments.
  • Use Xacta to maintain Security Body of Evidence (BoE) files and manage the A&A process for each system release cycle.
  • Provide guidance on applying security policy, identifying security requirements, determining technical approaches to satisfy requirements, and assessing the adequacy of required documentation.
  • Manage plans of action and milestones (POA&Ms) by working with project managers and engineers to develop schedules and engineering actions that mitigate open findings.
  • Monitor and audit operational systems for proper use.
Desired Qualifications
  • Proficiency with Xacta IA Manager or Xacta 360.

About the company

Mantis Security provides cybersecurity consulting for government and regulated industries, protecting information across the system lifecycle. It delivers C-level strategy, Zero Trust design, RMF/FISMA support, security architecture and engineering, IaC-based IT security automation, and cloud engineering for AWS government and DoD/IC regions. It applies data science and AI/ML to telemetry data to detect risks and speed cyber operations decisions. Led by veterans with intelligence community and DoD experience, its goal is to enable secure, compliant, and efficient cyber operations that reduce risk and accelerate mission readiness.

Company Size

11-50

Company Stage

N/A

Total Funding

N/A

Headquarters

Sarasota, Florida

Founded

2015

Simplify Jobs

Simplify's Take

What believers are saying

  • Careers pages updated September 2026 show active hiring across eight technical roles.
  • Demand aligns with zero trust, RMF, cloud, and DevSecOps work in federal IT.
  • Specialized cleared staffing in Reston and Herndon supports sticky contracts and referral hiring.

What critics are saying

  • We found no recent press releases or award wins; growth looks opaque.
  • Customer concentration stays heavy in Intelligence Community, DoD, and federal agencies.
  • A 2026 schedule slip or recompete loss on GSA contract 47QTCA21D0042 hits revenue fast.

What makes Mantis Security unique

  • McLean-based, intelligence-community-founded consultancy selling cleared cybersecurity talent to federal agencies.
  • GSA contract 47QTCA21D0042 keeps Mantis Security inside government procurement channels.
  • Openings in 2026 emphasize Cloud, HUMINT, ISSO, and DevOps roles.

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