Senior Systems Security Engineer - RMF/ATO & SIEM Lead

Sierra Nevada Corporation; Lone Tree (CO); On-site; USD 165,010 - 226,889; Full time

Benefits offered by this job

Medical, dental, and vision plans

401(k) with 150% match up to 6%

3 weeks paid time off

Tuition reimbursement

Job summary

Sierra Nevada Corporation is looking for a Principal Systems Security Engineer in Lone Tree, CO. This role involves overseeing the cybersecurity posture, compliance governance, and system accreditation in a multi-classification defense program environment.

The ideal candidate will possess deep expertise in cybersecurity principles, vulnerability management, NIST standards, and hands-on experience with SIEM tools. A current Top Secret U.S. Security Clearance is mandatory.

Qualifications

• 12+ years of experience in IT security or a related field.
• 8+ years in a formal ISSM role with ATO package ownership.
• Active Top Secret U.S. Security Clearance required.

Responsibilities

• Oversee the end-to-end cybersecurity posture and compliance governance.
• Execute vulnerability management and security monitoring.
• Develop and enforce security policies and procedures.

Skills

Cybersecurity principles

Vulnerability management

NIST standards

Hands-on security execution

Incident response

Education

Bachelor's degree in Systems Security or related field

Tools

Nessus/Tenable

Splunk SIEM

ELK Stack

DISA STIG

Job description

Sierra Nevada Corporation is looking for a Principal Systems Security Engineer in Lone Tree, CO. This role involves overseeing the cybersecurity posture, compliance governance, and system accreditation in a multi-classification defense program environment.

The ideal candidate will possess deep expertise in cybersecurity principles, vulnerability management, NIST standards, and hands-on experience with SIEM tools. A current Top Secret U.S. Security Clearance is mandatory.