Senior Systems Administrator — GCC High IAM & Entra

Radiant industries; El Segundo (CA); On-site; USD 140,000 - 190,000; Full time

Benefits offered by this job

Stock options

Medical benefits

Dental & Vision coverage

One Medical

Paid parental leave

Daily catered lunch

Flexible PTO

Onsite HQ near ocean

Job summary

Radiant, an El Segundo, CA-based startup, seeks a Senior Systems Administrator to own day-to-day systems within Microsoft 365 GCC High and build Entra-native identity automation. You will manage Exchange Online, SharePoint, Teams, and the tenant

as well as Windows/endpoint management via Intune, email security, Purview, and SaaS integrations. This role demands compliance focus for a CMMC framework and collaboration with IT DevOps on AWS workloads.

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 across GCC High tenant administration, Entra, self-built IAM automation, Intune without Group Policy, email security and 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
• Service is the job; tier-1 handles day-to-day support, but nobody's too senior to help the person at their desk

Responsibilities

• Own Microsoft 365 GCC High: Exchange Online, SharePoint, Teams, and the tenant configuration underneath them; be the authority on what's possible in this cloud and what has to be built in-house
• Own Entra end-to-end: conditional access, privileged access, app registrations, and single sign-on
• Build the IAM automation layer, the centerpiece of the role: joiner/mover/leaver lifecycle, entitlements driven by HR data, provisioning through Graph and SCIM, and access reviews that run themselves
• Own Windows and endpoint management through Intune, Autopilot, compliance policy, and update rings across the fleet, with no Group Policy underneath
• Own email security and information protection: Defender for Office, mail flow and anti-phishing posture, and Purview for DLP, labeling, and retention in an environment handling CUI
• Own SaaS administration and integration across the business application portfolio, including Box and Slack; some running today, some a project waiting for an owner
• Own the workloads, services, and licensing infrastructure running in AWS, in constant contact with the IT DevOps engineer who owns the account layer
• Take new platform projects from idea to deployed, integrated, and documented
• Implement and evidence the technical controls in these areas for the CMMC assessment ahead, as normal work rather than a detour

Skills

GCC High administration

Entra administration

IAM automation

Intune management

Email security

Purview DLP/Retention

SaaS/AWS administration

Networking fundamentals

Compliance evidence collection

Team collaboration

Education

Bachelor's degree in Information Technology, Computer Engineering, Cybersecurity, or related field

Tools

Intune

Entra ID

Microsoft Graph

Terraform/Bicep

PowerShell

Python

SaaS apps (Box, Slack)

Job description

Radiant, an El Segundo, CA-based startup, seeks a Senior Systems Administrator to own day-to-day systems within Microsoft 365 GCC High and build Entra-native identity automation. You will manage Exchange Online, SharePoint, Teams, and the tenant

as well as Windows/endpoint management via Intune, email security, Purview, and SaaS integrations. This role demands compliance focus for a CMMC framework and collaboration with IT DevOps on AWS workloads.