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

TEKsystems•Richardson, TX

3d•$75 - $85•Onsite

About The Position

TEKsystems is 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.

Requirements

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

Nice To Haves

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)

Responsibilities

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