Information Systems Security Engineer (ISSE) - Top Secret Clearance Required

TEKsystems

is seeking an Information Systems Security Engineer (ISSE) with a Top Secret Clearance in Richardson, TX in support of a Secure Development Environment

(SDE) Infrastructure Deployment to support classified and controlled engineering workloads associated with Department of Defense (DoD) programs.

This project is projected to be 12 months in duration and will include a one time 30 day CONUS travel assignment for a deployment.

About the Role

We are seeking an Information Systems Security Engineer (ISSE) to serve as the cybersecurity authority for our infrastructure program, ensuring all systems are designed, deployed, and operated in full compliance with DoD security requirements. You will own the security engineering lifecycle from initial architecture through ATO and into continuous monitoring — working across the infrastructure, network, and systems engineering teams to embed security at every layer of the environment. This is a senior , high-visibility role with direct engagement with government security stakeholders and program leadership.

What You'll Do

• Lead security engineering activities across the program, ensuring all infrastructure components are designed and implemented in accordance with DoD, DISA, and NIST security requirements
• Own the RMF process end-to-end, including system categorization, security control selection, implementation, assessment, and ATO package development and submission
• Develop and maintain all required RMF documentation including System Security Plans (SSPs), Security Assessment Reports (SARs), Plans of Action and Milestones (POA&Ms), and Risk Assessment Reports
• Lead STIG implementation and compliance activities across all infrastructure layers including servers, hypervisors, network devices, operating systems, and applications
• Design, deploy, and manage SIEM solutions for log aggregation, correlation, and security event monitoring across classified and unclassified environments
• Conduct and oversee vulnerability management activities including recurring scans, findings analysis, remediation tracking, and reporting
• Serve as the primary security liaison with government Authorizing Officials (AOs), ISSOs, and security control assessors
• Provide security engineering guidance to infrastructure, network, and systems engineering teams throughout the design and build phases of the program
• Develop and enforce security policies, procedures, and configuration baselines aligned with DISA STIGs and NIST 800-53 controls
• Support incident response activities including detection, containment, analysis, and reporting in coordination with government security teams
• Maintain continuous monitoring programs and ensure ongoing compliance with ATO conditions and security control requirements

What You Bring

• 8–10+ years of hands-on experience in information systems security engineering in DoD or cleared defense contractor environments
• Deep expertise in the RMF process including ATO package development and direct engagement with government authorizing officials
• Strong working knowledge of NIST 800-53, DISA STIGs, CNSSI 1253, and ICD 503 security frameworks
• Experience designing and implementing SIEM solutions and security monitoring architectures in classified environments
• Demonstrated experience leading vulnerability management programs including scanning tools such as Nessus, ACAS, or equivalent
• Broad technical understanding of infrastructure security across virtualization, networking, operating systems, and identity management layers
• Active Top Secret security clearance required; TS/SCI eligibility strongly preferred

Preferred Qualifications

• Experience supporting programs at the TS/SCI level
• Familiarity with cloud security frameworks and hybrid environment security architectures
• Experience with security automation, SOAR platforms, or scripting for security operations
• Knowledge of cross-domain solutions (CDS) and data transfer requirements in classified environments
• Familiarity with JSIG, ICD 503, or IC-specific security requirements
• Bachelor's degree in Cybersecurity, Computer Science, Information Technology, or a related field; equivalent experience considered
• DoD 8570/8140 IAT Level III or IASAE Level II or III certification (CISSP, CASP+, or equivalent)

This is a Contract position based out of Richardson, TX.

The pay range for this position is $75.00 - $85.00/hr.

Eligibility requirements apply to some benefits and may depend on your job classification and length of employment. Benefits are subject to change and may be subject to specific elections, plan, or program terms. If eligible, the benefits available for this temporary role may include the following:
• Medical, dental & vision
• Critical Illness, Accident, and Hospital
• 401(k) Retirement Plan – Pre-tax and Roth post-tax contributions available
• Life Insurance (Voluntary Life & AD&D for the employee and dependents)
• Short and long-term disability
• Health Spending Account (HSA)
• Transportation benefits
• Employee Assistance Program
• Time Off/Leave (PTO, Vacation or Sick Leave)

This is a fully onsite position in Richardson,TX.

This position is anticipated to close on Jul 10, 2026.

About TEKsystems

We're partners in transformation. We help clients activate ideas and solutions to take advantage of a new world of opportunity. We are a team of 80,000 strong, working with over 6,000 clients, including 80% of the Fortune 500, across North America, Europe and Asia. As an industry leader in Full-Stack Technology Services, Talent Services, and real-world application, we work with progressive leaders to drive change. That's the power of true partnership. TEKsystems is an Allegis Group company.

The company is an equal opportunity employer and will consider all applications without regards to race, sex, age, color, religion, national origin, veteran status, disability, sexual orientation, gender identity, genetic information or any characteristic protected by law.

About TEKsystems and TEKsystems Global Services

We’re a leading provider of business and technology services. We accelerate business transformation for our customers. Our expertise in strategy, design, execution and operations unlocks business value through a range of solutions. We’re a team of 80,000 strong, working with over 6,000 customers, including 80% of the Fortune 500 across North America, Europe and Asia, who partner with us for our scale, full-stack capabilities and speed. We’re strategic thinkers, hands-on collaborators, helping customers capitalize on change and master the momentum of technology. We’re building tomorrow by delivering business outcomes and making positive impacts in our global communities. TEKsystems and TEKsystems Global Services are Allegis Group companies. Learn more at TEKsystems.com.

The company is an equal opportunity employer and will consider all applications without regard to race, sex, age, color, religion, national origin, veteran status, disability, sexual orientation, gender identity, genetic information or any characteristic protected by law.

San Francisco Fair Chance Ordinance: Pursuant to the San Francisco Fair Chance Ordinance, for all positions located in the city and county of San Francisco, we will consider for employment qualified applicants with arrest and conviction records.

Massachusetts Lie Detector: It is unlawful in Massachusetts to require or administer a lie detector test as a condition of employment or continued employment. An employer who violates this law shall be subject to criminal penalties and civil liability.

Use of Artificial Intelligence (AI): We may use Artificial Intelligence (AI) to support parts of our hiring process, including sourcing, screening, and evaluating candidates. AI helps assess applications and qualifications, but final decisions are made by our hiring team. By applying, you acknowledge and agree that your application may be reviewed using AI tools.