Senior IT Systems Administrator (REQ 339)

APPLIED PHYSICAL SCIENCES CORP; Groton (CT); On-site; USD 90,000 - 130,000; Full time

Job summary

Applied Physical Sciences Corp in Groton, CT seeks a Senior IT Systems Administrator to support enterprise information systems and advance cybersecurity initiatives. You will implement and manage on‑prem and cloud environments, oversee policy and audits, and drive remediation of vulnerabilities in a DoD‑level setting.

The role requires DoD Secret clearance eligibility, strong Windows/M365 experience, and a proven track record across desktop/server virtualization and compliance.

Qualifications

• 7+ years experience in enterprise IT is preferred.
• Strong track record supporting desktop, server, virtualization, compliance, and cybersecurity operations.
• Experience with end-user support, break/fix tasks, and routine IT operations.
• Experience evaluating and implementing new systems based on business needs.
• Familiarity with Microsoft 365 administration and enterprise Windows environments.
• Experience with IT regulatory compliance programs (e.g., NIST 800-171, CMMC).
• Ability to obtain and maintain a DoD Secret security clearance (U.S. citizenship required).

Responsibilities

• Contribute to IT and cybersecurity compliance initiatives, including NIST 800-171 and CMMC, by writing/revising policy, implementing processes, and maintaining audit records.
• Design, deploy, implement, and support new technologies for both end users and administrators, across on‑prem and cloud environments.
• Lead and support IT break/fix calculations, operations, updates, lifecycle refreshes, and add/change activities.
• Help manage records labeling and retention efforts.
• Manage and remediate vulnerabilities in CUI and higher classification networks to maintain a secure, compliant enterprise environment.
• Support cybersecurity monitoring, analysis, and response efforts.

Skills

7+ years experience

Enterprise IT systems

Desktop support

Server administration

Virtualization

Compliance

Cybersecurity operations

End-user support

Windows enterprise

Microsoft 365 administer

NIST 800-171

CMMC

DoD security clearance

Tools

Tenable.SC

Nessus

Microsoft Purview

SIEM

Job description

Overview

Applied Physical Sciences (APS), a subsidiary of General Dynamics, is seeking a highly motivated and experienced Senior IT Systems Administrator to join our growing team. In this critical role, you will support and enhance enterprise-level information systems while driving the adoption of new technologies across the organization.

Job Functions and Responsibilities

• Contribute to IT and cybersecurity compliance initiatives, including NIST 800-171 and CMMC frameworks, by writing/revising policy, implementing processes, and maintaining audit records.
• Design, deploy, implement, and support new technologies for both end users and administrators, across on‑prem and cloud environments.
• Lead and support IT break/fix calculations, operations, updates, lifecycle refreshes, and add/change activities.
• Help manage records labeling and retention efforts.
• Manage and remediate vulnerabilities in CUI and higher classification networks to maintain a secure, compliant enterprise environment.
• Support cybersecurity monitoring, analysis, and response efforts.

Required Attributes and Skills

• Professional experience of 7 or more years is desired but may not be required in all circumstances.
• A strong track record supporting enterprise IT systems across desktop support, server administration, virtualization, compliance, and cybersecurity operations.
• Experience with end‑user support, break/fix tasks, and routine IT operations.
• Experience evaluating and implementing new systems based on business needs.
• Familiarity with Microsoft 365 administration and enterprise Windows environments.
• Experience supporting IT regulatory compliance programs (e.g., NIST 800‑171, CMMC).
• Ability to obtain and maintain a DoD Secret security clearance (U.S. citizenship required).

Preferred Attributes and Skills

• Experience with Microsoft Purview and data governance programs, both designing and implementing them.
• SIEM experience and comfort investigating security alerts.
• Linux administration capability in an enterprise setting.
• Experience managing a Microsoft 365 GCC‑High tenant.
• Knowledge of L2/L3 networking.
• Familiarity with Tenable.SC or Nessus vulnerability platforms.
• Strong documentation and communication skills.

This position is located in the Groton, CT office.

APS, a wholly owned subsidiary of the General Dynamics Corporation, offers competitive salaries, excellent benefits, and comfortable working conditions.

EOE: Vet/Disability

Invitation to Self-Identify

In keeping with our commitment to Equal Employment Opportunity (EEO), Applied Physical Sciences invites all applicants to self-identify pre-offer as a protected veteran and/or an individual with a disability.

Invitation to Self-Identify as Protected Veteran

Online Form

Invitation toVoluntary Self-Identification of Disability

Online Form