Amentum is looking for a Senior Systems Administrator to join our team in McLean, VA! As the Senior Systems Administrator, you will monitor and maintain corporate communication systems related to email and messaging; troubleshoot hardware, software, and network problems pertaining to the operation of Microsoft Exchange Servers in a Windows Active Directory environment; and oversee the status of issues related to messaging systems with the corporation and ensure that issues are resolved, documented, and closed in a timely manner. Must have an Active Top Secret/SCI US Government clearance. Note: US Citizenship is required to maintain a Top Secret/SCI clearance.

MAJOR DUTIES AND RESPONSIBILITIES:

• Serves as Microsoft Exchange Email Administrator, responsible for the design, specification, testing, and implementing of Microsoft Exchange Servers and resolves Exchange email system problems as required.
• Responsible for identifying, specifying, designing, testing, and implementing new Microsoft Exchange Servers computer technologies, including PC hardware, software, operating system (OS), and related peripherals.
• Determines when server, software, and OS upgrades are required and ensures that all upgrades are completed as scheduled, and that appropriate documentation exists prior to implementation.
• Knowledge of building server from start to finish to include (VM) Virtual Machines plus hardware
• Monitors Microsoft Exchange systems to facilitate proper performance and performs diagnostics as needed.
• Develops, implements, and documents configuration standards, policies, and procedures for operating, managing, and ensuring the security of Microsoft Exchange server ADS environment.
• Recommends appropriate actions on proposed Microsoft Exchange ADS projects regarding cost-effectiveness of proposed systems and preferred approaches; offers technical solutions to ensure success of projects, the security of the IT environment, and the efficient use of IT and human resources.
• Ensures the rigorous application of internal and external information security/information assurance policies, principles, and practices.
• Maintains effective relationship with appropriate vendors and acts as principal coordinator among various vendors to resolve Exchange-related problems.  This may involve the design, construction, and execution of complex system tests to identify causes of system degradation and to fix responsibility to specific vendor or vendors.
• Evaluates Commercial Off-The-Shelf (COTS) software to support Microsoft Exchange server; evaluates automation tools as well as special purpose tool as required.
• Provides general assistance, advice, and critiques to various IT users and management personnel regarding such matters as new or improved Microsoft Exchange system design, testing, and implementing techniques, documentation adequacy, user acceptance testing, and application efficiency/integrity.
• Serves as technical liaison on matter relating to the Microsoft Exchange ADS environment.
• Perform all other position related duties as assigned or requested.

MINIMUM REQUIREMENTS:

• Bachelor’s degree in computer science, Information Systems, Engineering or equivalent in a related field required. 
• Must have a minimum of six years of related experience. 
• Must have thorough understanding of Exchange 5.5/2000/2003. 
• Experience in administering Exchange servers including installation, back-up, and troubleshooting. 
• Experience with Windows Server NT/2000/2003 and Active Directory Services. 
• Experience with Identity Management Server; knowledge of systems management, performance tuning, and monitoring tools, Backup, Restore, and disaster Recovery planning. 
• Experience building a server (hardware) from scratch to operation
• Skilled in upgrading from Exchange 5.5 to Exchange 2000/2003. 
• Experience with Lagato, Veritas, or similar products; knowledge of anti-virus strategies. 
• Must be able to troubleshoot software and hardware problems, through understanding of industry standards and the ability to work with diverse workforce. 
• Knowledge of project management principles is highly desirable. 
• Strong verbal and written communication skills; must be organized and detail oriented. 
• Must be a team player and have the ability to interact with all levels of an organization in a professional, diplomatic, and tactful manner. 
• Must have an Active Top Secret/SCI US Government clearance. Note: US Citizenship is required to maintain a Top Secret/SCI clearance.

PREFERRED QUALIFICATIONS:

• MCP, MCSE, MCSA certification is highly desirable.

Work Environment, Physical Demands, and Mental Demands:

Typical office environment with no unusual hazards, occasional lifting to 20 pounds, constant sitting while using the computer terminal, constant use of sight abilities while reviewing documents, constant use of speech/hearing abilities for communication, and constant mental alertness; must possess planning/organizing skills and be able to work under deadlines.  Individual will perform most of his/her functions from the Network Administration Office where the network servers are located.  Individual will be required to access all network workstations for software and configuration upgrades, troubleshooting, repair, and modifications. Occasionally, individual will also install, replace, or repair transmission media, requiring his/her access to internal wall and false ceiling wiring.

Other Responsibilities:

Safety - Amentum enforces a safety culture whereby all employees have the responsibility for continuously developing and maintaining a safe work environment. As appropriate, each employee is responsible for completing all training requirements and fulfilling all self-aid/buddy aid responsibilities, participating in emergency response tasks and serving on safety committees and teams.

Quality - Quality is the foundation for the management of our business and the keystone to our goal of customer satisfaction. It is our policy to consistently provide services that meet customer expectations. Accordingly, each employee must conform to the Amentum Quality Policy and carry out job activities in compliance with applicable Amentum Quality System documents and customer contracts. Each employee must read and understand his/her Quality Management and Customer Satisfaction responsibilities.

Procedure Compliance - Each employee must read, understand and implement the general and specific operational, safety, quality and environmental requirements of all plans, procedures and policies pertaining to his/her job.

       

Compensation Details:

$101,343 - $150,000

       

The compensation range or hourly rate listed for this position is provided as a good-faith estimate of what the company intends to offer for this role at the time this posting was issued. Actual compensation may vary based on factors such as job responsibilities, education, experience, skills, internal equity, market data, applicable collective bargaining agreements, and relevant laws.

 

Benefits Overview:

Our health and welfare benefits are designed to support you and your priorities. Offerings include:

• Health, dental, and vision insurance

• Paid time off and holidays

• Retirement benefits (including 401(k) matching)

• Educational reimbursement

• Parental leave

• Employee stock purchase plan

• Tax-saving options

• Disability and life insurance

• Pet insurance

 

Note: Benefits may vary based on employment type, location, and applicable agreements. Positions governed by a Collective Bargaining Agreement (CBA), the McNamara-O'Hara Service Contract Act (SCA), or other employment contracts may include different provisions/benefits.

       

Original Posting:

02/04/2026 - Until Filled

Amentum anticipates this job requisition will remain open for at least three days, with a closing date no earlier than three days after the original posting. This timeline may change based on business needs.

       

Amentum is proud to be an Equal Opportunity Employer. Our hiring practices provide equal opportunity for employment without regard to race, sex, sexual orientation, pregnancy (including pregnancy, childbirth, breastfeeding, or medical conditions related to pregnancy, childbirth, or breastfeeding), age, ancestry, United States military or veteran status, color, religion, creed,  marital or domestic partner status, medical condition, genetic information, national origin, citizenship status, low-income status, or mental or physical disability so long as the essential functions of the job can be performed with or without reasonable accommodation, or any other protected category under federal, state, or local law. Learn more about your rights under Federal laws and supplemental language at Labor Laws Posters.