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Senior Information Systems Security Engineer; Government

Job in Reston, Fairfax County, Virginia, 22090, USA
Listing for: AT&T
Full Time position
Listed on 2026-01-02
Job specializations:
  • IT/Tech
    Cybersecurity, Systems Engineer
Salary/Wage Range or Industry Benchmark: 98100 - 206000 USD Yearly USD 98100.00 206000.00 YEAR
Job Description & How to Apply Below
Position: Senior Information Systems Security Engineer (Government)

Job Description

This position requires office presence of a minimum of 5 days per week and is only located at customer's site.

AT&T Global Public Sector is a trusted provider of secure, IP enabled, cloud-based, network solutions and professional services to the Federal Government. We are dedicated to recruiting, developing and empowering a diverse, high-performing workforce that is passionate about what they do, committed to our shared values and dedicated to our customers’ mission.

TAC2O (Technology Architecture for Command and Control Operations) is a five-year Task Order under the Helios IDIQ awarded to AT&T in December 2023. AT&T’s TAC2O contract provides a team of IT specialists who perform IT Engineering, Cybersecurity;
Communications Security, Systems Administration, Software Development, SharePoint Development and Administration, and Program Management services supporting sensitive technical collection and exploitation missions and focused on driving optimization of performance and cost over time across multiple security domains.

AT&T has an opening for an Senior Information Systems Security Engineer (ISSE) for the TAC2O systems program. This position will be providing managed IT support of TAC2O systems for high-priority defense intelligence collection needs.

Duties / Responsibilities
  • 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
Required Clearance

TS/SCI with Poly (Polygraph)

Required Qualifications
  • 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…
Position Requirements
10+ Years work experience
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