Senior Systems Administrator Jobs
Senior Systems Administrator jobs are open across healthcare, finance, government, and technology, from mid-level to staff and principal, with specializations in cloud infrastructure, Windows and Linux environments, and virtualization. Find a role that fits from the openings below and apply directly.
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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 Description:
We are seeking a skilled and experienced Cyber Infrastrastructure Systems Engineer (CISE) to join our team. The ideal candidate will have system administration expertise in Amazon Web Service (AWS) core services, managing and optimizing Linux systems, as well as infrastructure automation. This role requires a hands-on professional with a robust understanding of security and risk management, and system monitoring. The candidate must have a proven track record of designing and implementing solutions that comply with security policies, maintaining a secure and resilient IT environment.
Essential Functions:
-
Administer, support, and optimize cloud-based infrastructure within Amazon Web Services (AWS), including services such as:
- EC2
- S3
- IAM
- VPC
- RDS
- CloudWatch
- Lambda
- Configure, monitor, maintain, and troubleshoot Red Hat Linux systems.
-
Implement and manage Infrastructure as Code (IaC) and configuration management using tools such as:
- CloudFormation
- Terraform
- Ansible
- Installation of monitoring agents, STIGing, and Hardening AWS AMIs
- Monitor system performance and resource usage, identify potential problems, and implement solutions to maintain system resilience and security.
Qualifications:
- Bachelor’s Degree with a minimum of 6 years of relevant experience, or Graduate Degree with a minimum of 4 years of relevant experience, or in lieu of a degree, a minimum of 10 years of prior related experience.
- Clearance: Top Secret/Sensitive Compartmented Information (TS/SCI) with Counter-Intelligence Polygraph (CI Poly)
- DoD 8570.01-M IAT Level 2 Required Professional Certifications: CCNA- Security, Security+ CE, or higher certification
Preferred Additional Skills:
- Experience working with continuous integration, build management, and automated test frameworks.
- Experience utilizing virtualization technologies and backup solutions.
- Experience in a dynamic, fast-paced, team-oriented environment.
In compliance with pay transparency requirements, the salary range for this role in New York state is $92,500-$171,500. 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.
#LI-ZB2
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.
L3Harris Technologies is an E-Verify Employer. Please click here for the E-Verify Poster in English or Spanish. For information regarding your Right To Work, please click here for English or Spanish.
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 Description:
We are seeking a skilled and experienced Cyber Infrastrastructure Systems Engineer (CISE) to join our team. The ideal candidate will have system administration expertise in Amazon Web Service (AWS) core services, managing and optimizing Linux systems, as well as infrastructure automation. This role requires a hands-on professional with a robust understanding of security and risk management, and system monitoring. The candidate must have a proven track record of designing and implementing solutions that comply with security policies, maintaining a secure and resilient IT environment.
Essential Functions:
-
Administer, support, and optimize cloud-based infrastructure within Amazon Web Services (AWS), including services such as:
- EC2
- S3
- IAM
- VPC
- RDS
- CloudWatch
- Lambda
- Configure, monitor, maintain, and troubleshoot Red Hat Linux systems.
-
Implement and manage Infrastructure as Code (IaC) and configuration management using tools such as:
- CloudFormation
- Terraform
- Ansible
- Installation of monitoring agents, STIGing, and Hardening AWS AMIs
- Monitor system performance and resource usage, identify potential problems, and implement solutions to maintain system resilience and security.
Qualifications:
- Bachelor’s Degree with a minimum of 6 years of relevant experience, or Graduate Degree with a minimum of 4 years of relevant experience, or in lieu of a degree, a minimum of 10 years of prior related experience.
- Clearance: Top Secret/Sensitive Compartmented Information (TS/SCI) with Counter-Intelligence Polygraph (CI Poly)
- DoD 8570.01-M IAT Level 2 Required Professional Certifications: CCNA- Security, Security+ CE, or higher certification
Preferred Additional Skills:
- Experience working with continuous integration, build management, and automated test frameworks.
- Experience utilizing virtualization technologies and backup solutions.
- Experience in a dynamic, fast-paced, team-oriented environment.
In compliance with pay transparency requirements, the salary range for this role in New York state is $92,500-$171,500. 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.
#LI-ZB2
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.
L3Harris Technologies is an E-Verify Employer. Please click here for the E-Verify Poster in English or Spanish. For information regarding your Right To Work, please click here for English or Spanish.
Senior Systems Administrator Jobs by Experience Level
Top Cities Hiring Senior Systems Administrators
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Find JobsSenior Systems Administrator Job Market
Who's Hiring
- Northrop Grumman17
- General Dynamics Information Technology14
- Leidos11
- Peraton11
- Raytheon10
Top Industries Hiring
- Technology & Software18
- Education9
- Healthcare & Medical Services8
- Electronics & Hardware7
- Aerospace & Defense6
What Employers Look For
The qualifications that appear most often in senior systems administrator jobs.
- Five or more years of hands-on systems administration experience in enterprise environments
- Proficiency with Windows Server and Active Directory administration and management
- Experience managing Linux systems including configuration, patching, and user administration
- Hands-on experience with virtualization platforms such as VMware vSphere or Hyper-V
- Familiarity with cloud platforms including AWS, Azure, or Google Cloud infrastructure services
- Bachelor's degree in computer science, information technology, or a related technical field
Tips for Your Senior Systems Administrator Job Search
Tailor your resume to each environment
Senior systems administrator roles split sharply between Windows-heavy shops and Linux-dominant ones. Call out your primary OS environment, the hypervisors you've managed, and the scale you've operated at, whether that's a 50-node network or multi-site enterprise infrastructure.
Lead with certifications employers actually require
CompTIA Network+, Microsoft Certified: Azure Administrator, and Red Hat certifications appear repeatedly in job postings. List active certs near the top of your resume, not buried in a footnotes section, so recruiters confirm your qualifications in the first pass.
Apply early to roles that fit
Migrate Mate lists senior systems administrator openings from across the United States in one place, so you can find roles that match and apply directly to each listing.
Highlight automation and scripting contributions
Hiring managers for senior roles want proof you've reduced manual work. Name the scripts you've written in PowerShell, Python, or Bash and describe what they automated, whether patch deployment, user provisioning, or monitoring alerts, and the time or error-rate impact.
Prepare a structured answer on a major outage
Almost every senior systems administrator interview includes a question about handling a critical failure under pressure. Rehearse one clear story using a situation-action-result structure, covering how you diagnosed the issue, who you communicated with, and what you changed afterward.
Negotiate on total compensation, not just base
Senior systems administrator offers often include on-call stipends, certification reimbursement, and training budgets that vary widely between employers. Ask explicitly about each component during the offer stage so you're comparing full packages, not base salaries alone.
Senior Systems Administrator Jobs: Frequently Asked Questions
Which companies are hiring the most senior systems administrators?
The companies hiring the most senior systems administrators right now include Northrop Grumman, General Dynamics Information Technology, and Leidos, with the largest share of openings in Maryland, Virginia, and California, based on current listings on Migrate Mate as of August 2026. Healthcare systems, defense contractors, and large financial institutions consistently maintain some of the highest ongoing demand for this role.
How many senior systems administrator jobs are remote?
About 36% of senior systems administrator openings are fully remote or hybrid as of August 2026, reflecting the fact that much of the role can be performed through remote management tools and VPN access. Cloud-focused positions and those tied to SaaS or fully virtualized environments tend to offer the highest share of remote or hybrid flexibility, while roles involving on-premises hardware maintenance typically require more on-site presence.
How do you become a senior systems administrator?
Start by building a strong foundation in networking fundamentals, operating systems, and directory services through entry-level administrator or help desk roles. Progress by taking on broader infrastructure ownership, earning vendor certifications in areas like cloud or virtualization, and demonstrating that you can manage environments with minimal supervision. Most employers expect several years of demonstrated hands-on experience before considering a candidate for a senior designation.
Can you get hired as a senior systems administrator without direct experience at that level?
Yes, if you can demonstrate that your current or previous work matches senior-level scope, even without the title. Employers focus on what you've actually managed: the size of the environment, the complexity of the infrastructure, and whether you've owned projects end-to-end. Document specific systems you administered independently, incidents you led, and any mentorship or cross-functional work you handled to make that case clearly on your resume.
What does the senior systems administrator interview process look like?
Most processes include an initial recruiter screen, a technical interview covering OS administration, networking, and scripting concepts, and at least one round with the hiring manager or infrastructure team. Some employers add a practical component where you walk through a scenario or troubleshoot a simulated problem. Final rounds often include a culture or team fit conversation, and the full process typically runs across several weeks.
Where can I find and apply to senior systems administrator jobs?
You can find and apply to senior systems administrator jobs on Migrate Mate, which lists current openings from employers across the United States. Search the available roles, find the ones that match your background and preferences, and apply directly to each listing from the same place.
See All 666+ Senior Systems Administrator Jobs
Find roles that match your experience and apply in just a few clicks.
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