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Sr. ISSE TS​/SCI Polygraph

Job in Potomac, Montgomery County, Maryland, 20854, USA
Listing for: Leidos
Full Time position
Listed on 2026-05-09
Job specializations:
  • IT/Tech
    Cybersecurity, Systems Engineer, Information Security, IT Consultant
Salary/Wage Range or Industry Benchmark: 80000 - 100000 USD Yearly USD 80000.00 100000.00 YEAR
Job Description & How to Apply Below
Position: Sr. ISSE with TS/SCI Polygraph

Overview

Description

You must have an active TS/SCI Polygraph up front. Unfortunately, no exceptions.*

Leidos has a new and exciting opportunity for a Sr. Information System Security Engineer in our Intel Sector's Cyber & Analytics Business Area (CABA). Our talented team is at the forefront in Security Engineering, Computer Network Operations (CNO), Mission Software, Analytical Methods and Modeling, Signals Intelligence (SIGINT), and Cryptographic Key Management. At Leidos
, we offer competitive benefits, including Paid Time Off, 11 paid Holidays, 401K with a 6% company match and immediate vesting, Flexible Schedules, Discounted Stock Purchase Plans, Technical Upskilling, Education and Training Support, Parental Paid Leave, and much more. Join us and make a difference in National Security!

  • You must have an active TS/SCI Polygraph up front. Unfortunately, no exceptions.*

Leidos has an exciting opportunity for a Sr. Information System Security Engineer to join a high performing agile team using the Scaled Agile Framework (SAFe) methodology to support a fast-paced, complex program. Program execution follows DEVOPS best practices and employs robust development, test and production environments. Our team of security engineers support enhancements to system security architecture and cyber security capabilities;

manage multiple system security plans for development, test and production systems following the Risk Management Framework (RMF); manage cross domain capabilities; and support Security Verification Testing (SVT) of relevant Type 1 devices. The contract provides system engineering, development, test, integration and operational support, and is focused on injecting new technology and adding advanced capabilities while continuing to support an on-going operational system.

You will provide support for adding new capabilities to a complex system with exacting interface, performance and security requirements. You will become part of a team of Security Engineers working on providing improvements to our operational, test, integration, and development systems and solving challenging issues on a large, significant program. The position requires a solid understanding of security practices and policies as well as hands-on vulnerability testing experience.

Responsibilities
  • Validating and verifying system security requirements and establishing system security designs for large-scale systems, major system elements, and interfacing systems that are part of a large complex network environment with geographically distributed components.
  • Identifying and implementing appropriate information security architectures and functionality to ensure uniform application of security policy and enterprise solutions.
  • Recommending and developing technical solutions, products, and standards based on current and desired system security architecture.
  • Assessing and mitigating system security threats and risks throughout the program life cycle.
  • Leading and/or contributing to the security planning, assessment, risk analysis, risk management, certification and awareness activities for various system and networking operations.
  • Effective collaboration with other internal technical experts on a day-to-day basis.
  • Communicating with Program Managers and POCs from customer organizations regarding security issues of significant importance.
  • Participating in Program Increment Planning and related agile team activities.
  • Working closely with System Engineering, Test Engineering, and Integration teams to ensure that the hardware and software architecture and implementation meets security requirements.
  • Analyzing and assessing system implementation against multiple security compliance policies and recommending and implementing enhancements.
  • Evaluating security solutions to ensure they meet customer specified requirements for processing information.
  • Evaluating the impact of new development on the operational security posture of the system.
  • Evaluating, reviewing, and testing critical software.
  • Proposing, assessing, coordinating, implementing, and enforcing information systems security policies, standards, and methodologies.
  • Auditing and assessing system security configuration settings using common methodologies and tools.
  • Managing and enforcing security strategies and policies affecting various components of geographically distributed systems.
  • Providing configuration management for security-relevant information system software.
  • Serving as a subject matter expert in security architecture to include providing advice to Program Managers, Customer technical experts, and internal program teams.
  • Formulating security compliance requirements for new system features.
  • Identifying and remediating security issues throughout the system.
  • Supporting risk assessment, risk management, security control assessment, continuous monitoring, service design, and other IA program support functions.
  • Working with development teams to enrich team-wide understanding of vulnerabilities, attack vectors and remediation…
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