Senior System Administrator

The role

The Senior Systems Administrator will own the Microsoft 365 GCC High systems and build identity and access automation from the ground up. This role manages endpoint, email security, and SaaS infrastructure while implementing technical controls for CMMC assessments.

What you will do

• Own Microsoft 365 GCC High including Exchange Online, SharePoint, and Teams
• Manage Entra end-to-end including conditional access and single sign-on
• Build the IAM automation layer for joiner/mover/leaver lifecycles
• Manage Windows and endpoint management through Intune and Autopilot
• Own email security and information protection using Defender and Purview
• Administer and integrate SaaS applications like Box and Slack
• Manage workloads, services, and licensing infrastructure in AWS
• Take new platform projects from idea to deployment and documentation
• Implement and evidence technical controls for CMMC assessment

Required qualifications

• Bachelor's degree in Information Technology, Computer Engineering, Cybersecurity, or a similar field (4 years of work experience in lieu of a degree)
• 7+ years administering and engineering production systems
• Deep, hands-on experience with GCC High tenant administration, Entra, IAM automation, Intune, email security, Purview, and SaaS/AWS administration
• Solid networking fundamentals: VLANs, routing, firewall policy, DNS/DHCP, VPN, wireless
• Treats compliance control implementation and evidence collection as normal work
• Must be willing to work extended hours and weekends as necessary
• Must work 100% onsite at El Segundo HQ

Nice to have

• Purview depth: DLP, sensitivity labeling, retention, or eDiscovery
• CMMC or NIST 800-171 exposure
• Stood up identity governance tooling: Entra ID Governance, SailPoint, Okta Workflows, or equivalent
• Automation experience with PowerShell, Python, Microsoft Graph, and infrastructure as code (Terraform, Bicep, or similar)
• Written and maintained PowerShell modules other people use
• Deployed Box, Slack, or comparable platforms into a regulated environment

Benefits

• Substantial incentive stock plan for all full-time employees
• Medical: 100% up to base silver level plan for employee + 50% dependents, offers up to Platinum plans
• One Medical: Sponsored memberships for employees and their dependents
• Vision: 100% top tier plan coverage + 50% for dependents
• Dental: 100% top tier plan coverage, orthodontia extra, 50% for dependents
• Voluntary life, accident, hospital, critical illness, commuter and FSA/HSA offered as employee contributed benefits
• 8-weeks of paid parental leave for all parents
• Additional paid pregnancy leave for CA employees
• Nuclear Engineering Certificate Program: 100% covered educational program with Penn State University for eligible employees
• Daily catered lunch
• Free snacks and drinks
• Flexible PTO policy

Before you apply

• Any job offer made will be contingent upon the applicant’s capacity to serve in compliance with U.S. export controls

About the company

Radiant is an El Segundo, CA-based company building the world's only mass-produced, transportable nuclear microreactors. Founded in 2020, Radiant is under contract to deliver power to the U.S. Army, Navy and Air Force.