Sr. Associate, Cyber Infrastructure Systems Engineer - Systems Administrator

Jobtome; Green Mountain Falls (CO); On-site; USD 71,000 - 131,000; Full time

Job summary

L3Harris Technologies in Colorado Springs seeks a skilled Cyber Infrastructure Systems Engineer to administer Windows servers in a cleared DoD environment. You will patch, harden, and monitor systems, and support accreditation activities with security teams.

You should have a DoD-focused background, a 8570.01-M IAT II cert, and the ability to operate in a rigorous, security-conscious setting. This role offers growth and comprehensive benefits.

Qualifications

• Bachelor’s Degree and a minimum of 2 years of related experience, or equivalent with 6 years in lieu.
• Secret Clearance is required.
• DoD 8570.01-M IAT Level 2 certifications: CCNA-Security, Security+ CE, or higher.

Responsibilities

• Administer Windows-based servers/workstations in a cleared DoD environment.
• Manage OS patches, updates, and hotfixes per maintenance schedules.
• Apply DoD STIG security standards and hardening measures.
• Perform vulnerability remediation to meet RMF controls and audits.
• Monitor performance, availability, and mission system health.
• Troubleshoot hardware/software/access issues per security procedures.
• Maintain configuration records and documentation for inspections.
• Coordinate with cybersecurity teams for accreditation and incident response.

Skills

System administration

Patch management

Security hardening

Vulnerability remediation

RMF controls

Accreditation support

Education

Bachelor’s Degree (or equivalent) with 2+ years of experience

Graduate Degree or equivalent with 0–2 years

In lieu of a degree, 6+ years of related experience

Secret Clearance

DoD 8570.01-M IAT Level 2: CCNA-Security, Security+ CE, or higher

Tools

KVM

VMware

vSphere/vCenter

OpenShift

Docker

Job description

L3Harris is dedicated to recruiting and developing high-performing talent who are passionate about what they do. Our employees are unified in a shared dedication to our customers’ mission and quest for professional growth. L3Harris provides an inclusive, engaging environment designed to empower employees and promote work-life success. Fundamental to our culture is an unwavering focus on values, dedication to our communities, and commitment to excellence in everything we do.

L3Harris is the Trusted Disruptor in defense tech. With customers’ mission-critical needs always in mind, our employees deliver end-to-end technology solutions connecting the space, air, land, sea and cyber domains in the interest of national security.

Job Title: Sr. Associate, Cyber Infrastructure Systems Engineer -System Administration

Job Code: 44433

Job Location: Colorado Springs, CO

Job Schedule: 5/8 - Employees work 8 hours per day - 5 days a week

Job Description:

We are seeking a skilled and experienced Cyber Infrastructure Systems Engineer (CISE) to join our Colorado Springs, CO team. This role requires an experience system administrator who will be responsible for the administration and maintenance of Windows-based servers and workstations across a DoD cleared enterprise environment. Duties include managing patching activities, monitoring system performance, and implementing system hardening measures to strengthen security, ensure compliance with organizational standards, and maintain operational reliability. The position also supports ongoing troubleshooting, vulnerability remediation, and continuous improvement of system configurations and processes.

Essential Functions:

• Administer, maintain, and support Windows-based servers and workstations within a cleared enterprise or mission-critical DoD environment.
• Manage the deployment of operating system patches, security updates, and hotfixes in accordance with approved maintenance schedules and security requirements.
• Implement and sustain system hardening measures using applicable DoD security standards, STIGs, and organizational cybersecurity policies.
• Perform vulnerability identification and remediation activities to support compliance with RMF controls, POA&M tracking, and audit readiness efforts.
• Monitor system performance, availability, and operational health to ensure reliability and continuity of mission systems.
• Troubleshoot and resolve hardware, software, operating system, and access-related issues while adhering to established security procedures.
• Maintain accurate system configurations, change records, and technical documentation to support configuration management and compliance inspections.
• Coordinate with cybersecurity, network, and program teams to support accreditation activities, incident response, and secure system operations in classified or controlled environments.

Qualifications:

• Bachelor’s Degree and a minimum of 2 years of prior related experience. Graduate Degree or equivalent with 0 to 2 years of prior related experience. In lieu of a degree, minimum of 6 years of prior related experience.
• Secret Clearance
• DoD 8570.01-M IAT Level 2 Required Professional Certifications: CCNA- Security, Security+ CE, or higher certification'

Preferred Additional Skills:

• Experience serving as a DoD COMSEC Manager or supporting COMSEC account management, including handling, safeguarding, inventorying, and controlling cryptographic equipment and keying material in accordance with applicable DoD policies and procedures.
• Experience administering and supporting Red Hat Enterprise Linux (RHEL) systems in a DoD, federal, or other regulated environment, including patching, system hardening, user administration, and troubleshooting
• Utilizing virtualization technologies such as KVM, VMware, vSphere/vCenter, and microservices/containers (e.G., OpenShift, Docker) to enhance system functionality and efficiency

In compliance with pay transparency requirements, the salary range for this role in Colorado state is $70,500-$130,500. This is not a guarantee of compensation or salary, as final offer amount may vary based on factors including but not limited to experience and geographic location. L3Harris also offers a variety of benefits, including health and disability insurance, 401(k) match, flexible spending accounts, EAP, education assistance, parental leave, paid time off, and company-paid holidays. The specific programs and options available to an employee may vary depending on date of hire, schedule type, and the applicability of collective bargaining agreements.

The application window for this position will close on 11/10/2026.

L3Harris Technologies is proud to be an Equal Opportunity Employer. L3Harris is committed to treating all employees and applicants for employment with respect and dignity and maintaining a workplace that is free from unlawful discrimination. All applicants will be considered for employment without regard to race, color, religion, age, national origin, ancestry, ethnicity, gender (including pregnancy, childbirth, breastfeeding or other related medical conditions), gender identity, gender expression, sexual orientation, marital status, veteran status, disability, genetic information, citizenship status, characteristic or membership in any other group protected by federal, state or local laws. L3Harris maintains a drug-free workplace and performs pre-employment substance abuse testing and background checks, where permitted by law.

Please be aware many of our positions require the ability to obtain a security clearance. Security clearances may only be granted to U.S. citizens. In addition, applicants who accept a conditional offer of employment may be subject to government security investigation(s) and must meet eligibility requirements for access to classified information.

By submitting your resume for this position, you understand and agree that L3Harris Technologies may share your resume, as well as any other related personal information or documentation you provide, with its subsidiaries and affiliated companies for the purpose of considering you for other available positions.