Senior IT & Network Systems Administrator (Part-Time)

**About Four Sea Group, Inc.** **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.** **About the role** 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+ year 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. **What you'll do** - 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. - Use scripting and automation where appropriate, including PowerShell, JavaScript, Python, and infrastructure-as-code principles. **Required Qualifications** - 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. **Preferred Qualifications** - 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. - Experie…