Systems Security Administrator

Description We are looking for a Systems Security Administrator to support and strengthen enterprise security operations for an organization in Houston, Texas. This Long-term Contract position is ideal for a detail-oriented individual who can monitor threats, respond decisively to incidents, and help maintain a secure Microsoft-based environment. The role will work across security tools, vulnerability management processes, and infrastructure protection efforts while collaborating closely with technical teams to reduce risk and improve response readiness. Responsibilities: u2022 Monitor security platforms across the Microsoft ecosystem, including O365 E5 security solutions and endpoint protection tools, to identify and address potential threats quickly. u2022 Investigate alerts, analyze suspicious activity, and take appropriate containment and remediation steps to minimize operational and security impact. u2022 Administer and optimize SIEM and endpoint security technologies to improve detection accuracy, response efficiency, and overall platform performance. u2022 Manage vulnerability assessment tools such as Rapid7 or Tenable, including configuration tuning, reporting, and coordination of remediation priorities. u2022 Partner with internal teams to support patching efforts and help resolve challenges that affect vulnerability reduction and security compliance. u2022 Conduct proactive threat hunting and review intrusion detection and prevention data to uncover indicators of compromise or abnormal behavior. u2022 Install, maintain, and update security applications and controls to ensure continued effectiveness across the environment. u2022 Apply and support security policies, standards, and architecture practices across Windows systems, networking components, and firewall-related controls. u2022 Provide support during security events outside standard business hours when urgent incident response is required. u2022 Contribute to secure development and operational practices by collaborating with teams that use DevSecOps-related tools such as GitHub and similar platforms. Requirements u2022 2-3 years of hands-on experience working with Microsoft security technologies, including O365 E5 security products, Microsoft Defender, or comparable endpoint protection platforms. u2022 2-3 years of experience using vulnerability management solutions such as Rapid7 or Tenable, with the ability to administer and fine-tune the tools. u2022 Practical experience with SIEM tools, intrusion detection systems, or intrusion prevention technologies in a production environment. u2022 Solid understanding of Windows environments, core networking concepts, firewall principles, and enterprise security architecture. u2022 Proven ability to assess security incidents, investigate suspicious behavior, and support timely remediation activities. u2022 Strong communication skills with the ability to work effectively across technical teams on patching, risk reduction, and issue resolution. u2022 Experience deploying security software, maintaining security controls, and supporting the enforcement of security policies. u2022 Exposure to DevSecOps practices and tools, including platforms such as GitHub, is considered an advantage. Technology Doesn't Change the World, People Do.u00ae Robert Half is the worldu2019s first and largest specialized talent solutions firm that connects highly qualified job seekers to opportunities at great companies. We offer contract, temporary and permanent placement solutions for finance and accounting, technology, marketing and creative, legal, and administrative and customer support roles. Robert Half works to put you in the best position to succeed. We provide access to top jobs, competitive compensation and benefits, and free online training. Stay on top of every opportunity - whenever you choose - even on the go. Download the Robert Half app ( and get 1-tap apply, notifications of AI-matched jobs, and much more. All applicants applying for U.S. job openings must be legally authorized to work in the United States. Benefits are available to contract/temporary professionals, including medical, vision, dental, and life and disability insurance. Hired contract/temporary professionals are also eligible to enroll in our company 401(k) plan. Visit roberthalf.gobenefits.net for more information. u00a9 2025 Robert Half. An Equal Opportunity Employer. M/F/Disability/Veterans. By clicking u201cApply Now,u201d youu2019re agreeing to Robert Halfu2019s Terms of Use ( and Privacy Notice (.

Created: 2026-04-30