System Administrator II

Amentum; Rapid City (SD); On-site; USD 86,000 - 90,000; Full time

Benefits offered by this job

Health, dental & vision

Paid time off

401(k) matching

Educational reimbursement

Parental leave

Employee stock purchase plan

Tax-saving options

Disability & life insurance

Pet insurance

Job summary

Amentum is seeking a Systems Administrator in Rapid City, SD to install, configure, and troubleshoot computer systems and provide help desk support to users. The role requires active TS/SCI eligibility (US citizenship) and Security+ CE certification, plus hands-on Windows 11 and Windows Server 2016/2019 experience.

You will work within multi-user client/server environments and participate in root-cause analyses and process improvements.

Qualifications

• Active TS/SCI clearance or ability to obtain; US citizenship required.
• Security+ CE certification.
• DoD 8570.01-M IAT Level II training.
• 2–4 years IT and Windows OS experience.
• System or network administration skills for workstations/networks.
• Knowledge of network topology, standards, and protocols.
• Experience administering Windows 11 and Windows Server 2016/2019.
• Proficiency with Microsoft Office suite.

Responsibilities

• Assist with configuring, monitoring, troubleshooting desktops, servers, and networks.
• Participate in installation/administration of local systems using multiple protocols and tools.
• Write detailed technical problem reports and perform root-cause analyses.
• Install, upgrade, and administer Windows 11 and server OSes in multi-user environments.
• Provide IT help desk support to users.
• Perform other related duties as directed.

Skills

TS/SCI eligibility

Security+ CE

Windows 11 administration

Windows Server 2016/2019

Network administration

Office suite

Education

Associate degree preferred

Tools

Microsoft Office

Job description

Under general supervision by a senior Systems Administrator or other unit manager, installs, configures, and troubleshoots computer systems and associated assemblies and provides help desk technical assistance and training to system users/customer.

Work Environment:

• 24/7/265 Kinetic Mission Set
• 8 - 12hr Shifts on site (40hrs / week)
• Shifts rotate days and nights
• Mission Essential position
• Must report to duty in all WX conditions A/O remain over night

Essential Responsibilities:

• Assists with basic configuration, monitoring, troubleshooting, analysis of Desktop and Servers, networks, video systems.
• Participates in the installation and administration of local systems using multiple protocols and various computer systems/tools.
• Writes detailed/technical problem reports, assists with root cause analysis and recommendations for configuration and process changes.
• Installs, upgrades and administers operating systems and application software in multi-user client/server environments, using Windows 11 Enterprise.
• Provides customer with technical support by responding to IT help desk issues.
• Perform other related duties and tasks as directed.

Minimum Requirements:

• Must have an active Top-Secret Clearance with SCI eligibility or the ability to obtain TS/SCI. Note: US Citizenship is required to obtain a Top-Secret clearance.
• Must possess and maintain a Comp TIA Security+ CE certification.
• Trained in information assurance to DoD 8570.01-M IAT Level II
• 2-4 years’ information technology and Windows OS experience in the field.
• Posses demonstrated system or network administration skills, knowledge, and technical competence in the management of workstations, information systems and networks to include both hardware (A+) and software.
• Understand network topology, standards, and protocols.
• Possess hands-on experience administering Windows 11 as well as Windows Server 2016/9 experience.
• Possess a professional understanding and use of Microsoft Office Professional suite of software (Word, Access, Excel, PowerPoint, etc.).
• Must possess and maintain a current state issued driver’s license.

Preferred Requirements:

• Associates Degree is preferred in a related discipline augmented by ongoing academic/technical training and/or certification programs specific to the work unit hardware/software tools and

Compensation Details:

$86,000 - $90,000

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:

08/24/2026 - 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.