Senior System Administrator

Join Radiant, a company focused on commercializing the first mass-produced nuclear reactor. As a Senior Systems Administrator, you will be responsible for managing Microsoft 365 GCC High, building identity and access automation, and overseeing endpoint, email security, and SaaS infrastructure. You will also implement technical controls for the CMMC assessment and take new platform projects from idea to deployment. This is a high-ownership role in an interdisciplinary environment.

CMMC or NIST 800-171 exposure; leading an assessment is not required

Responsibilities

• Assumer la responsabilité de l'administration et de la configuration du locataire Microsoft 365 GCC High, y compris Exchange Online, SharePoint, Teams, et la configuration sous-jacente.
• Développer et mettre en œuvre l'automatisation de l'identité et de l'accès dans un environnement natif Entra, y compris le cycle de vie des employés, les droits d'accès basés sur les données RH, et les examens d'accès.
• Gérer la sécurité des e-mails et la protection des informations, y compris Defender for Office, le flux de messagerie et la posture anti-phishing, et Purview pour DLP, le marquage et la conservation.
• Deep, hands-on experience across the responsibilities above: GCC High tenant administration, Entra, self-built IAM automation, Intune without Group Policy, email security and Purview, and SaaS/AWS administration
• Service is the job; tier-1 handles day-to-day support, but nobody's too senior to help the person at their desk

7+ years administering and engineering production systems

• Treats compliance control implementation and evidence collection as normal work
• Must be willing to work extended hours and weekends as necessary to accomplish our mission
• Deployed Box, Slack, or comparable platforms into a regulated environment and handled the data boundary questions

Requirements

• Bachelor's degree in Information Technology, Computer Engineering, Cybersecurity, or a similar field (4 years of work experience in lieu of a degree)
• Solid networking fundamentals: VLANs, routing, firewall policy, DNS/DHCP, VPN, wireless
• Automation experience with PowerShell, Python, Microsoft Graph, and infrastructure as code (Terraform, Bicep, or similar)
• Written and maintained PowerShell modules other people use, not just scripts

Preferred

• Purview depth: DLP, sensitivity labeling, retention, or eDiscovery
• Stood up identity governance tooling: Entra ID Governance, SailPoint, Okta Workflows, or equivalent

Pay

USD 133,500 - 190,050