Information Systems Security Officer (ISSO) - Top Secret Clearance Required

TEKsystems is seeking an Information Systems Security Officer (ISSO) 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 Officer (ISSO) to support the security posture and compliance operations of our infrastructure program across classified and unclassified environments. Working closely with the ISSE and program leadership, you will serve as the day-to-day security operations authority — monitoring system compliance, maintaining RMF documentation, coordinating vulnerability remediation, and acting as the primary point of contact for

security-related activities on the program. This is a critical role for a security professional who thrives in a structured, compliance-driven environment and wants to make a direct impact on mission-critical defense systems.

What You'll Do

• Serve as the designated ISSO for assigned information systems, maintaining responsibility for the day-to-day security posture and compliance of those systems
• Support the RMF process including maintaining System Security Plans (SSPs), POA&Ms, and other ATO documentation in coordination with the ISSE
• Monitor systems for security compliance, configuration drift, and policy violations, escalating findings to the ISSE and program leadership as appropriate
• Coordinate and track vulnerability management activities including scan scheduling, findings review, remediation tracking, and reporting
• Conduct and support STIG compliance reviews across infrastructure components including servers, network devices, operating systems, and applications
• Support continuous monitoring activities and ensure ongoing adherence to ATO conditions and security control requirements
• Serve as the primary security point of contact for day-to-day interactions with government ISSMs, security control assessors, and authorizing official representatives
• Assist with security incident identification, reporting, and response activities in accordance with program and government requirements
• Conduct user security awareness activities and enforce program-specific security policies and procedures
• Maintain accurate and current security documentation including system inventories, access control records, and audit logs

What You Bring

• 5–7+ years of experience in an ISSO, security operations, or information assurance role supporting DoD or cleared defense contractor programs
• Working knowledge of the RMF process including ATO documentation requirements and interaction with government security stakeholders
• Solid understanding of NIST 800-53 security controls and DISA STIGs across common infrastructure platforms
• Experience supporting vulnerability management programs using tools such as Nessus, ACAS, or equivalent scanning platforms
• Familiarity with SIEM platforms and security event monitoring in classified environments
• Strong attention to detail and ability to manage multiple compliance workstreams simultaneously
• Active Top Secret security clearance required; TS/SCI eligibility preferred
• Security+ or equivalent DoD 8570/8140 IAT Level II certification required; CISSP or CASP+ a strong plus

Preferred Qualifications

• Prior experience serving as a designated ISSO on a DoD or IC program
• Familiarity with eMASS or equivalent RMF management tools
• Experience supporting programs at the TS/SCI or SAP/SAR level
• Knowledge of JSIG, ICD 503, or IC-specific security requirements
• Familiarity with cross-domain solutions and data transfer requirements in classified environments
• Bachelor's degree in Cybersecurity, Information Technology, Computer Science, or a related field; equivalent experience considered
• DoD 8570/8140 IAT Level III certification (CASP+, CISSP, 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.