Senior Systems Admin: Entra & IAM Automation (GCC High)

Radiant; El Segundo, Northern (CA, KY); Hybrid; USD 140,000 - 210,000; Full time

Benefits offered by this job

Incentive stock plan

Medical benefits

One Medical membership

Vision coverage

Dental coverage

8 weeks parental leave

Lunch provided

Remote workday allocation

HQ El Segundo

Job summary

Radiant, based in El Segundo, CA, seeks a Senior Systems Administrator to own day-to-day Microsoft 365 GCC High operations, Entra lifecycle, and IAM automation. You will manage Windows endpoints with Intune, email security, and a mixed SaaS/AWS environment, aligning with CMMC controls and security requirements.

You will build internal automation, support Box/Slack integrations, and collaborate with IT DevOps to maintain a robust, compliant infrastructure.

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 admin

Entra administration

IAM automation

Intune management

email security

SaaS administration

AWS administration

network fundamentals

compliance evidence

platform ownership

Education

Bachelor's degree in IT or related

Tools

Terraform

Bicep

Microsoft Graph

PowerShell

Job description

Radiant, based in El Segundo, CA, seeks a Senior Systems Administrator to own day-to-day Microsoft 365 GCC High operations, Entra lifecycle, and IAM automation. You will manage Windows endpoints with Intune, email security, and a mixed SaaS/AWS environment, aligning with CMMC controls and security requirements.

You will build internal automation, support Box/Slack integrations, and collaborate with IT DevOps to maintain a robust, compliant infrastructure.