IT Security Administrator Job Description

An IT security administrator runs the controls that keep an organization's accounts, devices and networks locked down. Where a security analyst spends the shift reading alerts, the administrator owns the settings that produce those alerts and the policies that stop an attack before it starts: who can sign in, from what device, with which second factor, through which firewall rule. The job sits inside the IT department or a small security team and reports to an IT manager, a security manager or, at a larger company, a director of security operations.

Identity is the center of the job. A typical week includes building and testing Conditional Access rules in Microsoft Entra ID or sign-on policies in Okta, cleaning up stale accounts and orphaned service principals, reviewing who holds Global Administrator or Domain Admin rights, and enrolling staff in stronger sign-in methods such as FIDO2 security keys or passkeys. Each change has to be piloted on a test group first, because a bad access rule can lock out a whole department on Monday morning.

The second block of work is hardening. That means pushing baselines through Group Policy or Intune, keeping endpoint detection agents healthy on every laptop and server, managing certificates before they expire, and making sure local administrator passwords are randomized and vaulted. On the network side the administrator reviews firewall change requests, removes rules nobody can explain, and keeps VPN or zero trust access gateways patched.

Vulnerability management fills much of the remaining time. Scans from tools such as Tenable, Qualys or Rapid7 produce long lists of findings; the administrator sorts them by exposure and business impact, assigns owners, chases patch dates and documents any exception the business accepts. When the help desk escalates a suspicious login or a user reports a phishing email, the administrator pulls the sign-in logs, revokes sessions, resets credentials and hands anything larger to the incident response lead.

Paperwork is part of the job, not a distraction from it. Auditors and cyber insurance carriers want evidence: screenshots of MFA enforcement, access review sign-offs, patch reports, written procedures. A good administrator keeps that evidence current so an audit becomes a filing exercise rather than a scramble.

Scope depends on the size of the shop. In a company with one IT team, the security administrator may also run backups, email filtering and the help desk escalation queue. In a large enterprise the title can narrow to a single platform, such as identity governance, firewall operations or endpoint management, with separate teams handling detection and response. Either way, the administrator is the person who turns written security policy into working configuration and can prove it was done.

As a rough guide, employers look for a bachelor's degree in information technology, cybersecurity, computer science or information systems, though an associate degree paired with solid hands-on experience can open the door at smaller organizations. O*NET places the matching occupation in Job Zone Four and notes that most of these occupations require a four-year bachelor's degree, but some do not. Military IT and communications backgrounds can translate well, especially for employers that handle government work.

Hands-on time counts. One route runs through roughly two to four years on a help desk or as a systems or network administrator, then into security duties. People who have already managed Active Directory groups, written Group Policy, rebuilt a firewall rule base or rolled out an endpoint agent arrive with the muscle memory this job needs.

Certifications worth pursuing

• CompTIA Security+ (CompTIA): validates the practical skills needed to perform core security functions.
• CompTIA Cybersecurity Analyst+ (CySA+) (CompTIA): covers detecting, analyzing and responding to cybersecurity threats, useful because administrators triage scan results and suspicious logins.
• Microsoft Certified: Identity and Access Administrator Associate (Microsoft, exam SC-300): built around Microsoft Entra ID, hybrid identity and identity governance. Microsoft's page says candidates should be familiar with PowerShell and Kusto Query Language (KQL).

Technical skills that come up in the work

• Identity platforms: Microsoft Entra ID, Active Directory, Okta, and a privileged access tool such as CyberArk or Delinea
• Endpoint: Microsoft Intune, Defender for Endpoint, CrowdStrike Falcon, SentinelOne
• Network: Palo Alto Networks, Fortinet or Cisco firewalls, plus VPN and zero trust access gateways
• Vulnerability scanning: Tenable Nessus, Qualys, Rapid7 InsightVM
• Logs and queries: KQL in Microsoft Sentinel or Defender, Splunk SPL for organizations on Splunk
• Scripting: PowerShell first, with Python helpful for API work and report automation

Frameworks to read, not memorize. CIS Benchmarks for hardening baselines, the CIS Critical Security Controls, and NIST guidance on digital identity give administrators shared language with auditors.

Working habits. Strong administrators write change tickets that a stranger could follow, test on a pilot group before broad rollout, and explain a blocked sign-in to a frustrated executive without jargon. Keeping a personal lab, even a small Entra tenant and a pair of virtual machines, is a practical way to try a policy before it touches production.

O*NET groups security administrator titles with information security analysts, an occupation it rates as a Bright Outlook occupation. It reports employment of 192,900 in 2025, projects growth from 2025 to 2035 as much faster than average (7% or higher), and expects about 14,100 openings a year on average. BLS does not report security administrators separately, so those figures cover analysts, specialists and administrators together.

Identity work changed under the administrator's feet

One concrete shift since 2024 came from Microsoft. Its mandatory MFA program started in October 2024, when MFA became required for accounts signing in to the Azure portal, the Microsoft Entra admin center and the Microsoft Intune admin center to create, read, update or delete resources. Enforcement for the Microsoft 365 admin center began gradually in February 2025, and Phase 2 began rolling out gradually on October 1, 2025, covering create, update and delete operations through Azure CLI, Azure PowerShell, the Azure mobile app, infrastructure-as-code tools and REST API endpoints. Read operations do not require MFA under Phase 2. Microsoft's guidance also notes that some customers use a user account in Entra ID as a service account and recommends moving those to cloud-based service accounts with workload identities, which puts automation that signs in as a user account on the administrator's list.

A second deadline fell one day earlier. Microsoft announced in March 2023 that it was deprecating management of authentication methods in the legacy MFA and self-service password reset (SSPR) policies, and beginning September 30, 2025, authentication methods can no longer be managed there. Microsoft recommended migrating to the unified Authentication methods policy by that date, a migration that someone in identity administration has to plan, test and document.

The bar for MFA moved up

Turning on any MFA does not settle the question. A joint phishing guide from CISA, NSA, the FBI and MS-ISAC recommends FIDO or PKI-based MFA, and for organizations that cannot get there yet, number matching in push apps to counter MFA fatigue. NIST's SP 800-63-4 digital identity guidelines, which supersede SP 800-63-3, state that applications assessed at AAL2 must offer a phishing-resistant authentication option. Where an organization adopts that guidance, rolling out security keys and passkeys, handling lost-key recovery and documenting exceptions falls to the administrator.

Where the pay sits

Pay also varies by employer type. BLS industry data for May 2025 shows a median of $132,410 for information security analysts in computer systems design and related services, against $101,760 in federal, state and local government (excluding state and local schools and hospitals and the Postal Service). Administrators who own identity, endpoint and cloud controls together can move toward security engineer or identity architect roles; others step into security operations leadership or governance work after a few audit cycles.

Dear Hiring Manager,

I am applying for the IT Security Administrator position on your infrastructure team. For the past three years I have been the systems administrator responsible for security controls at a regional engineering firm with offices in three cities, and I am ready to make security my full-time focus.

Most of my work has been in identity. When I inherited our Microsoft Entra tenant, it still relied on per-user MFA settings and a handful of shared admin accounts that nobody wanted to own. I mapped every privileged account, retired the shared ones, moved our administrators to separate cloud-only admin identities and rebuilt our Conditional Access rules around a small pilot group before rolling them out company-wide. I also led the move of our authentication settings into the unified Authentication methods policy and issued FIDO2 security keys to everyone with admin rights.

On the endpoint side, I manage our Intune baselines and Defender for Endpoint deployment, and I run monthly vulnerability scans in Tenable. I built a simple PowerShell report that matches open findings to server owners and sends each owner a weekly list, which turned patching from a quarterly argument into a routine. When our insurance carrier asked for evidence of our controls at renewal, I had screenshots, policy exports and access review records ready within a day.

I hold CompTIA Security+ and I am preparing for the SC-300 exam. Your posting mentions a project to bring contractors under the same access policies as staff; that is exactly the kind of work I want to do next, and I would welcome the chance to discuss how I would approach it.

Thank you for your time and consideration.

Sincerely, Jordan Ellery