Full-Time

Linux Administrator

Acas

CACI

CACI

10,001+ employees

Provides government contracting technology and services

Compensation Overview

$75.2k - $158.1k/yr

No H1B Sponsorship

Springfield, VA, USA + 1 more

More locations: St. Louis, MO, USA

In Person

On-site in Springfield, VA or Saint Louis, MO; local travel up to 10%.

US Top Secret Clearance Required

Category
Software Engineering (1)
Required Skills
Vulnerability Analysis
Linux/Unix

Get referred to CACI

See people who can refer or advise you

Requirements
  • Top Secret/SCI clearance (current), with the ability to successfully obtain/maintain a polygraph (post-hire)
  • Bachelor’s Degree and or equivalent experience in a related field and Six (6) years of relevant experience. Additional experience may be considered in lieu of a degree.
  • DoD 8570 IAT III (current); CSSP Analyst certifications must be obtained within 120 days of the hire date
  • Expert at operating and maintaining Linux systems
  • Experience operating and maintaining applications hosted in a Linux environment
  • Experience with vulnerability management applications, such as Nessus or ACAS
Responsibilities
  • Provide all preventative and corrective maintenance to ensure consistent, reliable, and secure service availability. This includes all actions required to return the service to full operational capability such as vendor RMA processes, removal and proper disposal of broken equipment/software, installation and testing of new equipment/software, and configuration of new equipment/software
  • Perform day-to-day maintenance, and specific scheduled maintenance activities that result from manufacturers' recommended service intervals, alerts, bulletins, available patches, and updates according to agency-approved change management processes. This includes maintaining updated documentation, change logs, and service bulletin libraries for all supported equipment and software in the CSOC knowledge management platform
  • Execute emergency maintenance actions with sufficient urgency to preclude unacceptable outage durations, approved by the Government before execution, and coordinated through and approved by CSOC and ESC government management
  • Perform all development, engineering, testing, integration, and implementation actions necessary for major vendor revisions
  • Perform continuous engineering assessments to improve the performance, effectiveness, coverage, and maturity of this service. These assessments are limited to improvements that can be achieved without the purchase of additional hardware or software
  • Perform all development, design, engineering, testing, integration, and implementation actions necessary to perform a full technology refresh every four years or upon Asset contract recompete, whichever comes first (Note: The assets supporting this service are acquired through a DoD contract). This includes the removal and disposal of the legacy capability
  • Operate all assets assigned to this service within the Government Furnished Information - Software Tools list in accordance with vendor instructions, industry best practices, government directives, policies, procedures, etc.
  • Ensure all required data is routed to the DoD CMRS database in the appropriate format, and validate the accuracy of data contained within CMRS weekly
  • Configure all assets assigned to this service within the Government Furnished Information - Software Tools list by all customer laws, directives, orders, policies, guidance, procedures, etc.
  • Ensure this service provides 100% coverage of all applicable customer enclaves, domains, information flows, and devices. Provide weekly reports to CSOC government leadership on any people, processes, or technology challenges preventing the achievement of 100% coverage
  • Use various monitoring, analysis, and visualization tools to track effectiveness, status, performance metrics, and other information as needed or required by CSOC government staff and contractors assigned Cybersecurity Operations Services and Cybersecurity Readiness Services
  • Track vendor end-of-life and end-of-support status for assets in CDRL D0009 Asset Inventory Perform all development, design, engineering, testing, integration, and implementation actions needed for the total integration and interoperability between all applicable assets in the Government Furnished Information - Software Tools list.
  • Utilize agency-approved ticketing systems to document, track, assign, update, and coordinate all engineering, integration, configuration, and maintenance actions
  • Report as vendor updates are received

CACI International Inc. provides technology and professional services to U.S. government clients, focusing on national security and modernization. It earns most of its revenue through long-term government contracts that fund engineering, intelligence, logistics, cybersecurity, data analytics, and IT solutions for defense, intelligence, and federal civilian agencies. Its products and services work by delivering specialized technical expertise, secure systems, and mission-support capabilities that help agencies run operations more efficiently and securely. CACI differentiates itself through its deep domain knowledge in national security, a proven track record of delivering high-quality, reliable solutions, and a skilled workforce that can execute complex, long-duration contracts. The company’s goal is to be a trusted partner for government modernization needs by providing advanced technology solutions and mission support that enhance national security and operational effectiveness.

Company Size

10,001+

Company Stage

IPO

Headquarters

Reston, Virginia

Founded

1962

Get referred to CACI

See people who can refer or advise you

Simplify Jobs

Simplify's Take

What believers are saying

  • SkyValor deployment can accelerate revenue from border and homeland-defense programs.
  • Federal modernization demand supports CACI's financial systems, cloud, and secure-network offerings.
  • International operations add exposure to allied government and commercial customers outside U.S. spending.

What critics are saying

  • U.S. government contracts drive nearly all revenue, creating severe budget and recompete exposure.
  • SkyValor production delays or failures would damage a visible counter-drone growth story.
  • Cleared talent shortages would constrain delivery capacity and slow contract execution.

What makes CACI unique

  • CACI sells mission and enterprise IT to defense, intelligence, and federal civilian agencies.
  • SkyValor expands CACI's counter-UAS platform beyond labor-heavy services into productized systems.
  • CACI pairs cleared talent with C4ISR, cyber, and engineering capabilities.

Help us improve and share your feedback! Did you find this helpful?

Benefits

Health Insurance

Flexible Work Hours

401(k) Retirement Plan

401(k) Company Match

Wellness Program

Growth & Insights and Company News

Headcount

6 month growth

5%

1 year growth

5%

2 year growth

5%
Yahoo Finance
Apr 10th, 2026
CACI wins $287M Army tech contract to modernize personnel and pay system

CACI International has secured a seven-year $287 million contract to modernise the US Army's Integrated Personnel and Pay System-Army, supporting over one million users. The company also confirmed its optical communications hardware played a central role in NASA's Artemis II mission. The defence technology contractor is scheduled to release Q3 FY2026 earnings on 22 April, with consensus expecting mid-single to low-double digit revenue and earnings growth. Analysts project CACI could reach $10.9 billion in revenue and approximately $684 million in earnings by 2028. The contract reinforces CACI's position as a federal technology partner in defence and space programmes, though the company remains heavily reliant on US government budgets. The investment narrative centres on execution of large, high-value contracts whilst managing federal spending exposure.

Yahoo Finance
Apr 9th, 2026
CACI delivers laser comms and sensing tech to NASA's Artemis II crewed Moon mission

CACI International has contributed optical communications and sensing technology to NASA's Artemis II mission, the first crewed flight of the Space Launch System rocket and Orion spacecraft. The company developed an optical communications modem module in partnership with MIT Lincoln Laboratory, integrated into the Orion Artemis II Optical Communications System payload. The O2O system successfully delivered high-definition video and data from the lunar vicinity to Earth via laser link, marking a milestone in deep-space communications. Through its acquisition of ARKA Group, CACI also supplied cryogenic-level sensing technology for the SLS rocket, supporting propellant-level measurement and engine shutdown determination during ascent. CACI's hardware is developed across multiple US locations, including Danbury, Connecticut, and Florham Park, New Jersey.

CACI International Inc
Mar 13th, 2026
CACI Closes $500 Million Offering of 6.375% Senior Notes

CACI International Inc ( NYSE: CACI ) today announced it closed a $500 million offering of 6.375% unsecured senior notes due in 2033 (the “notes”). The notes will be issued as part of the same series as CACI’s 6.375% senior notes due 2033 originally issued in June 2025. CACI intends to use the net proceeds from the offering to repay certain indebtedness under its revolving credit facility that was incurred to pay a portion of the purchase price of its acquisition of ARKA Group L.P. and costs and expenses related thereto. About CACI CACI International Inc (NYSE: CACI) is a national security company with 27,000 talented employees who are Ever Vigilant in expanding the limits of national security. We ensure our customers’ success by delivering differentiated technology and distinctive expertise to accelerate innovation, drive speed and efficiency, and rapidly anticipate and eliminate threats. Our culture drives our success and earns us recognition as a Fortune World's Most Admired

Mammoth Times
Mar 12th, 2026
CACI closes $500M bond offering to fund ARKA Group acquisition debt repayment

CACI International has closed a $500 million offering of 6.375% unsecured senior notes due in 2033. The notes will be issued as part of the same series as CACI's 6.375% senior notes originally issued in June 2025. The company intends to use the net proceeds to repay indebtedness under its revolving credit facility, which was incurred to finance its acquisition of ARKA Group L.P. and related costs. CACI is a national security company with 27,000 employees. The firm is a member of the Fortune 500, the Russell 1000 Index and the S&P MidCap 400 Index.

Yahoo Finance
Mar 11th, 2026
CACI surges 180% in 5 years on strong EPS growth, but weak backlog points to demand concerns

CACI International, a defence and intelligence solutions provider, has surged 180% over the past five years, reaching $630.12 per share and outperforming the S&P 500's 72.6% total return. The stock has gained 29.6% in the last six months. The company demonstrated solid long-term performance with revenue growing at 8.8% compound annual growth rate over five years. More impressively, earnings per share expanded at 14% annually, indicating improved profitability. However, CACI's backlog growth has been weak, averaging just 3.6% year-on-year over the last two years. This underwhelming performance suggests increasing competition may be challenging the company's ability to secure new orders. The stock currently trades at 20.6× forward price-to-earnings ratio.