Senior IT Systems Administrator (REQ 339)

Applied Physical Sciences Corp (APS); Connecticut; On-site; USD 110,000 - 140,000; Full time

Job summary

Applied Physical Sciences (APS) seeks a Senior IT Systems Administrator to strengthen enterprise IT operations in Groton, CT and oversee cybersecurity compliance across on‑prem and cloud environments.

The role emphasizes advancing NIST 800-171 and CMMC frameworks, vulnerability management, and end‑to‑end system support. U.S. citizenship and a DoD security clearance are required. Competitive benefits accompany a dynamic team.

Qualifications

• 7+ years in IT operations or equivalent role with enterprise scope.
• Experience across desktop support, server admin, virtualization, and cybersecurity operations.
• Familiarity with Microsoft 365 administration and Windows enterprise environments.
• Experience supporting regulatory compliance programs (NIST 800-171, CMMC).
• Ability to obtain/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 end users and administrators across on‑prem and cloud environments.
• Lead and support IT break/fix escalations, 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

Enterprise IT systems

Desktop support

Server administration

Virtualization

NIST 800-171 / CMMC

Microsoft 365 administration

Windows enterprise

Cybersecurity operations

DoD security clearance

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 escalations, 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. Candidates must be able to obtain a DoD security clearance. Please note, obtaining a security clearance is a condition of employment which typically requires US citizenship and a thorough background investigation.

Equity, Diversity, and Inclusion

EOE: Vet/Disability

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.