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Four Sea Group is a 100% employee-owned technical mission support company based in Denver, Colorado. Founded by an aerospace industry veteran and PhD astrophysicist, we support complex defense, space, software, systems, and mission-focused programs for government and industry partners. What sets FSG apart is the caliber of our people and the way we operate: we are a reputation-driven team of highly skilled engineers and technical experts who are brought in for their depth, judgment, and ability to solve difficult problems. As an employee-owned company, we have built our compensation, benefits, and culture around a simple idea: when the company succeeds, that value should go back to the people doing the work.

Four Sea Group is seeking a part-time Senior IT & Network Systems Administrator to manage and support our Microsoft 365, Azure, AWS, endpoint, network, backup, collaboration, and physical office technology environments.

The ideal candidate has 10+ years of progressive IT, systems administration, network administration, cloud administration, and security operations experience. This is a senior hands‑on role for someone who can operate independently, improve security posture, troubleshoot complex issues, support users, and maintain reliable IT operations across a small government contractor environment.

• Administer and secure Microsoft 365, Azure, Entra ID, Intune, Purview, Defender, Sentinel, Conditional Access, Autopilot, and Windows Update configurations.
• Manage endpoint provisioning, Windows 11 hardening, vulnerability remediation, CIS benchmark remediation, device compliance, application deployment, and user support.
• Support AWS services, including IAM / SSO, S3, CloudFront, and CodeDeploy.
• Administer and troubleshoot Juniper network equipment, JunOS configurations, LAN/WAN connectivity, Wi‑Fi, routing, switching, and related network infrastructure.
• Manage SharePoint permissions, data organization, access controls, and collaboration structure.
• Support Commvault backups, Zoom for Business, Zoom Rooms, Logitech conferencing equipment, printers, office IT equipment, and other physical technology assets.
• Support macOS device management, Jamf, Rippling authentication workflows, and general employee technical support.
• Create and maintain documentation, standard operating procedures, and repeatable technical processes.
• Support CMMC, NIST SP 800-171, CUI handling, audit evidence collection, and secure separation between multiple environments.

• 10+ years of relevant experience in IT systems administration, network administration, cloud administration, endpoint management, security operations, or related infrastructure support roles.
• Strong hands‑on experience with Microsoft 365, Azure, Entra ID, Intune, Defender, Purview, Sentinel, Conditional Access, and Windows endpoint management.
• Experience supporting AWS, enterprise networking, backup operations, collaboration tools, and physical office technology.
• Ability to troubleshoot complex issues across identity, endpoint, cloud, network, security, and user support areas.
• Strong documentation skills and the ability to create reliable, repeatable IT processes.
• Ability to work in the Denver, Colorado area, within a hybrid environment, and provide on‑site support when needed.

• Experience supporting a government contractor, defense contractor, or regulated environment.
• Familiarity with CMMC, NIST SP 800-171, CUI handling, GCC High, or Microsoft compliance tooling.
• Experience with Juniper / JunOS, Commvault, Jamf, macOS, Zoom Rooms, Logitech conference systems, and SharePoint information architecture.
• Microsoft, CompTIA, AWS, Cisco, Juniper, or security‑related certifications.

The salary range for this role is $95,000–$130,000 per year. The salary range provided is a good faith estimate representative of all experience levels. Four Sea Group, Inc. considers several factors when extending an offer, including but not limited to, the role, function and associated responsibilities, a candidate’s work experience, location, education/training, key skills, and market conditions.

This position is expected to remain open through August 31, 2026. The company may adjust this deadline based on business needs and will update the posting as appropriate.

FSG is 100% ESOP‑owned, which means our employees share directly in the company’s growth. We offer competitive compensation, a strong employer‑funded retirement plan, generous PTO and flexible time‑off options, comprehensive health, dental, vision, life, short‑term disability, and long‑term disability benefits, plus a generous medical stipend that gives employees more choice and flexibility. Our model is intentionally built to keep more value with employees through salary, retirement, benefits, and ownership. You will work alongside experienced engineers and technical leaders on meaningful defense, space, software, systems, and mission support work, with room to grow as a technical expert, mentor, program contributor, or future leader.

Four Sea Group is an equal opportunity employer and considers qualified applicants for employment without regard to race, color, sex, sexual orientation, gender identity or expression, religion, national origin, marital or familial status, age, disability, veteran status, militaryserviceor application for military service.