Senior Security Administrator - Cyber Defense & Compliance

Alpha & Omega Semiconductor

Sunnyvale, Northern (CA, KY)

Hybrid

USD 120,000 - 180,000

Full time

14 days+

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Job summary

Alpha and Omega Semiconductor, Inc. is seeking a hands-on Senior Security Administrator to bolster the company’s cybersecurity program across endpoints, networks, identity/access, email security, and incident response.

This temporary role offers a path to a regular full-time position, with collaboration across IT Infrastructure, automation, and external vendors. The ideal candidate has 5+ years in IT security, experience with SIEMs, MFA, AD/Microsoft Entra ID, VPNs, and email security, and a

Qualifications

5+ years in IT security, security administration, or cybersecurity operations.
Hands‑on experience with endpoint security, firewalls, vulnerability management, SIEM, MFA, AD, VPN, and email security.
Experience investigating alerts, reviewing logs, and coordinating remediation with technical teams.
Working knowledge of NIST CSF, CIS Controls, ISO 27001, or similar cybersecurity frameworks.
Experience supporting audits, access reviews, security evidence collection, and remediation tracking.
Strong communication, documentation, troubleshooting, and cross‑functional coordination skills.

Responsibilities

Monitor and triage security alerts from SIEM/log management, endpoint protection, EDR, firewall, DNS security, WAF, DLP, vulnerability scanning, and security rating tools.
Administer and support security technologies including Cisco FirePower, McAfee Endpoint/DLP, SecureWorks Redcloak, IMAP/ITAP SIEM, OpenDNS/Cisco Umbrella, Imperva WAF/DDoS, ManageEngine PAM, Nessus, Entra ID/MFA, and Proofpoint.
Operate vulnerability management processes, including scanning, risk prioritization, remediation tracking, exception documentation, and reporting.
Support identity and access management activities, including MFA enforcement, VPN access control, privileged access review, and account provisioning/deprovisioning validation.
Assist with phishing investigations, endpoint security events, email quarantine review, DLP alerts, and malware response.
Participate in incident response activities, including investigation, containment, remediation, documentation, and lessons learned.
Prepare and maintain audit evidence, control documentation, security procedures, diagrams, access review records, vulnerability reports, and incident records.
Support customer security questionnaires, ITGC audits, supplier security reviews, cybersecurity insurance requests, and board/audit reporting as needed.