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Information Systems Security Engineer

Job in Tysons, Fairfax County, Virginia, USA
Listing for: Cornerstone Defense LLC
Full Time position
Listed on 2026-06-02
Job specializations:
  • IT/Tech
    Cybersecurity, Systems Engineer, IT Consultant
  • Engineering
    Cybersecurity, Systems Engineer
Salary/Wage Range or Industry Benchmark: 80000 - 100000 USD Yearly USD 80000.00 100000.00 YEAR
Job Description & How to Apply Below

Information Systems Security Engineer

Location:

Tysons, VA

Clearance:
Active TS/SCI with Polygraph needed to apply

Company Overview

Cornerstone Defense is the Employer of Choice within the Intelligence, Defense, and Space communities of the U.S. Government. Realizing early on that our most prized assets are our employees, we continually focus our attention on improving the overall work/life experience they have supporting the mission. Our Team is pushed every day to use their industry leading knowledge to provide end-to-end solutions to combat our nation’s toughest and most secure problems.

If you are looking for a place to not only be professionally challenged, but encouraged and supported by a company that cares, don’t look any further than Cornerstone Defense.

Benefits Overview
  • Medical, Dental and Vision Plans
  • Generous PTO Policy
  • 401(k)
  • HSA and FSA options
  • Life and Disability Insurance
  • Tuition Reimbursement and Training
  • Perks at Work Discount Program
  • Referral Program
  • Leads Generation Program
  • College America 529
  • Fitness Reimbursement Program
  • Travel Assistance
  • Norton Lifelock Benefit Solutions
  • Life Planning Financial & Legal Services
Description

The Information Systems Security Engineer supports the client and the team in defining security requirements; advises on, executes and oversees cybersecurity, information assurance (IA) programs, authority to operate (ATO), accreditation and authorization (A&A), User Activity Monitoring (UAM), and system security plans.

Responsibilities
  • Lead for automated security testing efforts leveraging Sponsors enterprise scanning tools
  • Responsible for creation and delivery of the Monthly Vulnerability Scans
  • Responsible for creation and delivery of the Monthly Privileged Users and Admin report
  • Overall Lead for ensuring systems are secure by protecting data and ensuring need to know
  • Responsible for working with Tech team on creating any necessary POAM's
  • Helps PM with the Contract Security Plan
  • Works with PM and Sponsor's Information System Security Manager and INFOSEC Program Council as necessary
  • Authors and maintains the programs System Security Plan (SSP) for A&A
  • Provides the required security education and plan to sponsor for the program
  • Authors and maintains the programs Automated Information Systems (AIS) Plan
Required Skills
  • 4-7 years’ experience with:
  • Application security standards and processes
  • Accreditation and Authorization (A&A), including documentation, POAMs, and remediation
  • Application and data security requirements for authorities to develop and operation systems (ATD, ATO) such as encryption, role-based security, information assurance, and monitoring/auditing/reporting
  • Coordination with engineering team to implement security requirements
  • Agile / Scrum
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