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Istari logo
Istari

Empowering our physical world with a digital one

Cybersecurity Engineer – Classified Infrastructure

Security EngineerSecurity EngineerFull TimeRemoteSeniorTeam 11-50H1B No SponsorCompany SiteLinkedIn

Location

United States

Posted

86 days ago

Salary

$116K - $174K / year

Seniority

Senior

Bachelor Degree4 yrs expEnglishLinuxTypeScript

Job Description

Cybersecurity Engineer – Classified Infrastructure

Istari

• Deploy and secure Istari’s platform in SIPR, JWICS, and air-gapped environments • Implement and validate DISA STIGs • Implement and validate NIST 800-53 / 800-171 controls • Perform hands-on security work, including System hardening (Windows & Linux) • Conduct Vulnerability scanning (ACAS/Nessus) • Perform STIG validation and remediation • Manage POA&M • Design, configure, or support secure network architectures, including segmentation, boundary defense, and routing in classified environments • Troubleshoot and resolve security configuration issues • Address connectivity and compliance blockers • Work directly with customer security teams (ISSO, ISSM, AO, SCA) • Collaborate with program and infrastructure teams • Provide feedback to engineering on real-world deployment constraints and security improvements

Job Requirements

  • Active TS clearance with SCI eligibility
  • Security+ (required) — CISSP, CISM, or CASP+ preferred
  • 4+ years of hands-on experience in cybersecurity, system administration, or network engineering
  • Direct experience with NIST 800-53 / 800-171
  • Direct experience with DISA STIGs
  • Experience operating in Classified environments (SIPR, JWICS, SAP)
  • Strong experience securing Windows and/or Linux systems
  • Hands-on System Patching, STIG implementation and validation
  • Experience running scans, remediating findings, and managing POA&Ms
  • Experience designing or supporting Secure network architectures in classified environments
  • Knowledge of Network segmentation, boundary defense, and secure connectivity
  • Familiarity with STIGs for network devices and infrastructure

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