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Senior Information Systems Security Engineer; ISSE

Job in Reston, Fairfax County, Virginia, 22090, USA
Listing for: DAn Solutions
Full Time position
Listed on 2026-01-16
Job specializations:
  • IT/Tech
    Cybersecurity, Systems Engineer
Job Description & How to Apply Below
Position: Senior Information Systems Security Engineer (ISSE)

REQUIRES AN ACTIVE/EXISTING TS/SCI WITH CI POLYRAPH

The job duties of the Sr. ISSE are as follows:

  • Provides technical expertise to ensure the network systems meet DIA C&A and IA requirements and are properly certified and accredited
  • Responsibilities are full-time on customer's onsite and will cover classified programs and Special Access Programs (SAP). No Telework.
  • Designs, develops, and recommends integrated security system and physical control solutions that will ensure proprietary/confidential data and systems are protected
  • Assist team in DIA's Authorization and Accreditation (A&A) process using RMF across the design lifecycle for classified systems obtaining and maintaining Interim Authorization to Test (IATT), Authority to Connect (ATC) and Authorization to Operate (ATO)
  • Offers technical engineering services for the support of integrated security systems and solutions, managing information-related risks effectively
  • Works closely with the client during the strategic design process to translate security and business requirements into actionable technical designs
  • Configures and validates secure systems and physical controls, and tests security products and systems to detect security weakness
  • Develop comprehensive system test plans (STP) to assess the security posture of the information systems
  • Analyze scan results and security findings to prioritize remediation efforts and implement corrective measures
  • Participate in incident response activities and assist in the resolution of security incidents as needed
Requirements:
  • Exhibits advanced Windows administration capabilities and Linux proficiency for optimal system management
  • Security credentials, certifications, and experience commensurate with the job description
  • Practical experience deploying, maintaining, and troubleshooting security tools
  • Demonstrates the ability to critically assess current practices, identify deficiencies, propose innovative solutions, and effectively implement these improvements
  • Thrives in a fast-paced, complex environment; displays exceptional poise and an unwavering commitment to hard work
  • Displays excellent problem-solving abilities and attention to detail
  • Experience with each of the following security tools:
    Assured Compliance Assessment Solution (ACAS), Trellix, Splunk, and Security Technical Implementation Guide (STIG)'s
  • Collaborate with stakeholders to identify security requirements and ensure alignment with organizational objectives
  • Stay abreast of the latest security trends, technologies, and best practices to continually enhance the security posture of the information systems
  • A Bachelor's Degree from an accredited institute in an area applicable to this position and four (4) years of relevant experience
  • An additional four (4) years of relevant experience may be substituted for the bachelor's degree
  • Must presently be 8570 compliant (IAT Level 2 preferred); must be 8570 compliant (IAT Level
    2) by date of security indoctrination with any necessary continuing education (CE) for certification
Desired

Qualifications:
  • Familiar with tiered security environments (U, S, TS)
  • Deep understanding of Trellix antivirus suite of products
  • Knowledge of Splunk architecture and experience structuring multi-level queries
  • Windows expert - capable of advanced Powershell scripting and general administrative functions
  • Experience with one or more commercial government cloud service provider's system accreditation process
  • Experience as a Cybersecurity Control Assessor for SAP
  • Experience with Ongoing Authorizations and Assessments
  • Experience with C2S Cloud, or Dev Ops Sec
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Position Requirements
10+ Years work experience
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