Windows System Administrator (Onsite) (DoD Secret Clearance)

Prattwhitney; El Segundo (CA); On-site; USD 96,000 - 182,000; Full time

Benefits offered by this job

Medical insurance

Dental insurance

Vision insurance

401(k) with employer matching

Tuition reimbursement

Life insurance

Disability coverage

Employee Assistance Plan

Job summary

Collins Aerospace is seeking an experienced IT System Administrator in El Segundo to install, configure, and maintain Windows and RHEL servers. You’ll enforce security configurations, perform patches, and monitor performance to ensure high availability.

The role requires DoD SECRET clearance and DoD STIGs expertise, plus strong problem-solving and teamwork. Join us to apply security best practices, conduct audits, manage access controls, and collaborate with IT teams while contributing to

Qualifications

• Typically requires a University Degree and minimum 5 years relevant experience or an Advanced Degree with 3+ years.
• U.S. citizenship is required for security clearance eligibility.
• DoD SECRET clearance is required.
• DoD STIGs experience on Windows and RHEL systems and workstations.
• Proven system administration experience on Windows and RHEL platforms.
• Experience with ESXi virtualization and VMware tools.
• Excellent problem solving and communication skills.
• Ability to work independently and in a team.

Responsibilities

• Install, configure, and maintain Windows and RHEL servers.
• Perform regular system updates, patches, and security configurations.
• Monitor system performance for high availability and reliability.
• Manage user accounts, permissions, and access controls.
• Provide technical support and troubleshooting for end-users and internal teams.
• Respond to and resolve system-related incidents and service requests.
• Collaborate with other IT teams to resolve complex issues.
• Implement and maintain security best practices and DoD STIGs.
• Conduct regular security audits and vulnerability assessments IAW NIST 800-53.
• Develop backup/recovery strategies and perform data backups.
• Test disaster recovery procedures and maintain documentation.

Skills

DoD STIGs

Windows Server

RHEL

VMware ESXi

VMware

KVM

Problem solving

Communication

Teamwork

Security best practices

Education

University Degree

Advanced Degree in related field

Tools

ESXI

Windows

RHEL

VMware

KVM

Job description

Date Posted: 2026-11-03 Country: United States of America Location: US-CA-EL SEGUNDO-E01 ~ 2000 E El Segundo Blvd ~ BLDG E01 Position Role Type: Onsite U.S. Citizen, U.S. Person, or Immigration Status Requirements: Active and transferable U.S. government issued security clearance is required prior to start date. U.S. citizenship is required, as only U.S. citizens are eligible for a security clearance. Security Clearance Type: DoD Clearance: Top Secret Security Clearance Status: Active and existing security clearance required on day 1 Collins Aerospace is a leader in technologically advanced, intelligent solutions that help redefine the aerospace and defense industry. With a comprehensive portfolio and deep technical expertise, we help customers meet the demands of the global market. Join us and help shape the future of aerospace and defense.

What You Will Do

• Install, configure, and maintain Windows and RHEL servers.
• Perform regular system updates, patches, and security configurations.
• Monitor system performance and ensure high availability and reliability.
• Manage user accounts, permissions, and access controls.
• Provide technical support and troubleshooting for end-users and internal teams.
• Respond to and resolve system-related incidents and service requests.
• Collaborate with other IT teams to resolve complex issues.
• Implement and maintain security best practices for system administration.
• Conduct regular security audits and vulnerability assessments IAW NIST 800-53.
• Ensure compliance with IT policies and regulatory requirements.
• Develop and implement backup and recovery strategies.
• Perform regular data backups and ensure data integrity.
• Test and validate disaster recovery procedures.
• Maintain accurate documentation of system configurations and procedures.
• Generate regular reports on system performance, security, and compliance.

Qualifications You Must Have

• Typically requires a University Degree and minimum 5 years prior relevant experience or an Advanced Degree in a related field and minimum 3 years of experience.
• U.S. citizenship is required, as only U.S. citizens are eligible for a security clearance.
• DoD SECRET security clearance.
• CompTia Security+ certification.
• Extensive experience with applying DoD STIGs to Windows and RHEL servers and workstations.
• Proven experience as a System Administrator with proven experience in Windows and RHEL.
• Proven experience as a System Administrator with proven experience using ESXI machines.
• Excellent problem-solving and communication skills.
• Ability to work independently and as part of a team.

Qualifications We Prefer

• Experience with virtualization technologies (VMware, KVM).

What We Offer

• Medical, dental, and vision insurance.
• Three weeks of vacation for newly hired employees.
• Generous 401(k) plan that includes employer matching funds and separate.
• Employer retirement contribution, including a Lifetime Income Strategy option.
• Tuition reimbursement program.
• Student Loan Repayment Program.
• Life insurance and disability coverage.
• Optional coverages you can buy pet insurance, home and auto insurance, additional life and accident insurance, critical illness insurance, group legal, ID theft protection.
• Birth, adoption, parental leave benefits.
• Ovia Health, fertility, and family planning.
• Adoption Assistance.
• Autism Benefit.
• Employee Assistance Plan, including up to 10 free counseling sessions.
• Healthy You Incentives, wellness rewards program.
• Doctor on Demand, virtual doctor visits.
• Bright Horizons, child, and elder care services.
• Teladoc Medical Experts, second opinion program.
• And more!

The salary range for this role is 95,500 USD - 181,700 USD. The salary range provided is a good faith estimate representative of all experience levels.

RTX anticipates the application window closing approximately 40 days from the date the notice was posted. However, factors such as candidate flow and business necessity may require RTX to shorten or extend the application window.

RTX is an Equal Opportunity Employer. All qualified applicants will receive consideration for employment without regard to race, color, religion, sex, sexual orientation, gender identity, national origin, age, disability or veteran status, or any other applicable state or federal protected class. RTX provides affirmative action in employment for qualified Individuals with a Disability and Protected Veterans in compliance with Section 503 of the Rehabilitation Act and the Vietnam Era Veterans’ Readjustment Assistance Act.

Join Collins Aerospace to help us revolutionize the aerospace industry today! WE ARE REDEFINING AEROSPACE.

From making aircraft more electric, intelligent and integrated to building new software platforms such as Internet of Things, big data, artificial intelligence, and blockchain, there’s no better place to be right now than in digital. If you’re an agile thinker who enjoys utilizing modern technology to make big improvements, then you’re a perfect fit for this team. and be part of the team that’s redefining aerospace, every day.

Role Type Definitions

Please consider the following role type definitions as you apply for this role. Onsite: Employees who are working in Onsite roles will work primarily onsite. This includes all production and maintenance employees, as they are essential to the development of our products. Regardless of your role type, collaboration and innovation are critical to our business and all employees will have access to digital tools so they can work with colleagues around the world – and access to Collins sites when their work requires in-person meetings. At Collins, the paths we pave together lead to limitless possibility. And the bonds we form – with our customers and with each other – propel us all higher, again and again.

As part of our commitment to maintaining a secure hiring process, candidates may be asked to attend select steps of the interview process in-person at one of our office locations, regardless of whether the role is designated as on-site, hybrid or remote. This role is a U.S.-based role. If the successful candidate resides in a U.S. territory, the appropriate pay structure and benefits will apply.

RTX is an aerospace and defense company that provides advanced systems and services for commercial, military and government customers worldwide. It comprises three industry-leading businesses – Collins Aerospace, Pratt & Whitney, and Raytheon. Its 195,000 employees enable the company to operate at the edge of known science as they imagine and deliver solutions that push the boundaries in quantum physics, electric propulsion, directed energy, hypersonics, avionics and cybersecurity. The company, formed in 2020 through the combination of Raytheon Company and the United Technologies Corporation aerospace businesses, is headquartered in Arlington, Virginia.