Top Companies Hiring for Systems Administrator Jobs

GDIT is a global technology and professional services company that delivers technology solutions and mission services to every major agency across the U.S. government, defense and intelligence community. Our 30,000 experts extract the power of technology to create immediate value and deliver solutions at the edge of innovation. We operate across 50+ countries worldwide, offering leading capabilities in digital modernization, AI/ML, cloud, cyber and application development.

From day one, IBMers have the trust to create incredible things that alter the future for us, for each other, for our clients — and for the world. Around the globe, we’re constantly evolving who we are, adapting with purpose, and building an environment where everyone thrives, both individually and collectively. In partnership with our clients, we lead the way in groundbreaking technologies to make a difference in local communities – IBMers innovate with curiosity, openness, and a shared commitment to redefine industries and build what’s next.

To be a marine, you gotta have faith. The United States Marine Corps' motto, Semper Fidelis, Latin for always faithful, reflects service members' dedication to each other, their corps, and their country. The Marine Corps has two missions: make Marines and win battles. The military branch operates artillery, aviation, expeditionary, and infantry units. It has four divisions and works out of about 35 bases and stations in the US and Japan. It is the smallest of the military branches with just more than 202,000 active duty personnel and some 40,000 reservists. The Marine Corps traces its roots to the American Revolution and 1775, when the Continental Marines was formed.

Northrop Grumman is a leading global aerospace and defense technology company. Our pioneering solutions equip out customers with the capabilities they need to connect and protect the world and push the boundaries of human exploration across the universe. Driven by a shared purpose to solve our customers’ toughest problems, our nearly 100,000 employees define possible every day. © 2026 Northrop Grumman is an Equal Opportunity Employer, making decisions without regard to race, color, religion, creed, sex, sexual orientation, gender identity, marital status, national origin, age, veteran status, disability, or any other protected class. For our complete EEO and pay transparency statement, please visit http://www.northropgrumman.com/EEO. U.S. Citizenship is required for all positions with a government clearance and certain other restricted positions.

The US Department of the Army has its marching orders. One of the three military departments (along with the Air Force and Navy) of the US Department of Defense, the Army provides ground-based military forces to deter and fight wars and protect the security of the US. The army has more than 675,000 soldiers, including active duty soldiers (nearly 75%) and reservists (Army National Guard and Army Reserves). Army personnel are deployed in about 80 countries. The Army operates about 40 forts throughout the US and has bases in Africa, Europe, Japan, the Middle East, and South Korea.

America’s Navy is the most versatile branch of the military, forging defense on land, in the air, and at sea. With opportunities across the globe and a commitment to serve the greater good, the Navy offers a life of fulfillment, advancement, and innovation to every Sailor.

SAIC® is a premier mission integrator focused on advancing the power of technology and innovation to serve and protect our world. Our robust portfolio of offerings across the defense, space, intelligence, and civilian markets includes secure high-end solutions in mission IT, enterprise IT, engineering services, and professional services. We integrate emerging technology, rapidly and securely, into mission critical operations that modernize and enable critical national imperatives. We are approximately 23,000 strong; driven by mission, united by purpose, and inspired by opportunities. Headquartered in Reston, Virginia, SAIC has annual revenues of approximately $7.3 billion. For more information, visit saic.com. For ongoing news, please visit our newsroom.

Leidos is an industry and technology leader serving government and commercial customers with smarter, more efficient digital and mission innovations. Headquartered in Reston, Virginia, with 48,000 global employees, Leidos reported annual revenues of approximately $16.7 billion for the fiscal year ended January 3, 2025. For more information, visit www.leidos.com.

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