Senior Active Directory & Systems Admin (On-Site Austin)

Core Scientific; Austin (TX); On-site; USD 95,000 - 125,000; Full time

Job summary

Core Scientific, a leading provider of infrastructure for high-performance compute, seeks a strong generalist Systems Administrator with AD focus to own the health, security, and day-to-day administration of our Active Directory environment at the downtown Austin office.

You’ll collaborate with identity, security, and endpoint teams to maintain a well-governed environment and advance modern best practices across IT operations.

Qualifications

• 5+ years of hands-on systems administration experience in a professional environment.
• Very strong Active Directory expertise: domain services, Group Policy, replication, trusts, sites and services, and directory security.
• Deep experience managing domain controllers, DNS, and DHCP in a production environment.
• Strong PowerShell skills for AD automation, reporting, and bulk operations.
• Solid understanding of AD security best practices: tiered admin models, delegation, privileged access, and common attack paths (e.g., Kerberoasting, pass-the-hash).
• Experience with hybrid identity concepts and directory synchronization to cloud platforms.
• Broad generalist skills across Windows Server administration, networking fundamentals, and troubleshooting.
• Clear written and verbal communication and strong documentation habits.
• Ability to work on-site full-time in downtown Austin, TX.

Responsibilities

• Own day-to-day Active Directory administration: user, group, and computer object management, OU design, delegation, and directory hygiene.
• Design, maintain, and troubleshoot Group Policy across the environment, keeping GPOs consolidated, documented, and effective.
• Administer and maintain domain controllers, including replication health, FSMO roles, backups/recovery, and patching.
• Manage core network services tied to the directory: DNS, DHCP, and site/subnet topology.
• Harden and secure the directory: tiered administration, least-privilege delegation, privileged account management, and remediation of common AD attack paths.
• Support hybrid identity, including directory synchronization to cloud identity platforms and clean attribute/data flows.
• Automate routine directory tasks and reporting with PowerShell.
• Support day-to-day IT operations across the environment: escalated troubleshooting, server and SaaS administration, and infrastructure projects as needed.
• Participate in audits and access reviews with clear evidence from the directory.
• Document architecture, processes, and runbooks so the environment is well understood and supportable.
• Foster open, respectful, and professional communication directly within the team as well as with co-workers/ teammates and leaders across the organization.
• Performs other duties as assigned.
• undefined

Skills

Active Directory

PowerShell

DNS/DHCP

Windows Server

Hybrid identity

Group Policy

Troubleshooting

Documentation

On-site Austin

Tools

Okta

Microsoft 365

Entra ID

Intune

Jamf Pro

Slack

Jira Service Management

Job description

Core Scientific, a leading provider of infrastructure for high-performance compute, seeks a strong generalist Systems Administrator with AD focus to own the health, security, and day-to-day administration of our Active Directory environment at the downtown Austin office.

You’ll collaborate with identity, security, and endpoint teams to maintain a well-governed environment and advance modern best practices across IT operations.