Systems Administrator IV

Description Position Overview We are seeking a highly experienced Senior Systems Engineer to support enterprise infrastructure with a focus on Active Directory, authentication services, and certificate management. This role will partner closely with infrastructure leadership to design, implement, and maintain secure and scalable identity and directory services. The ideal candidate will bring deep expertise in Windows Server, Active Directory, DNS, certificate authorities, and authentication frameworks, combined with strong scripting capabilities and a proactive, problem-solving mindset. This role requires ownership, collaboration across engineering teams, and the ability to operate in complex, multi-tiered environments. Key Responsibilities Identity & Directory Services Configure, maintain, and troubleshoot Active Directory, DNS, and Certificate Authority environments Manage authentication systems including ADFS, SAML, SSO, and Okta Administer certificate lifecycle management across enterprise systems Infrastructure Engineering & Automation Develop PowerShell scripts to monitor system health and automate operations Support scalable infrastructure across physical, virtual, and cloud environments Implement Group Policy and role-based access management Security & Compliance Apply NIST and DISA security standards and system hardening practices Manage certificate issuance and ensure zero-downtime implementation Apply patches, enforce compliance, and maintain system integrity Operations & Support Provide Tier

II / III

support in Windows Server and Windows 11 environments Troubleshoot and resolve complex infrastructure issues Maintain system documentation and architecture design artifacts Collaboration & Optimization Work closely with engineering, system owners, and cross-functional stakeholders Identify process improvements and implement infrastructure optimizations Support project delivery, timelines, and operational priorities Requirements Required Qualifications Bachelor's degree in Computer Science, Systems Engineering, or related field (or equivalent experience) 8+ years of systems engineering or administration experience Strong expertise in Active Directory, DNS, and Certificate Management Experience with ADFS, Okta, or authentication platforms Proficiency in PowerShell scripting Experience providing Tier

II / III

Windows support Strong troubleshooting, documentation, and communication skills Preferred Qualifications Experience with Azure AD / Entra ID Experience with DevOps tools and automation workflows Knowledge of networking fundamentals (TCP/IP) Certifications such as CCNA, CCNP, or ITIL v3 Experience working in security-focused environments Technology Doesn't Change the World, People Do. Robert Half is the world's 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. 2025 Robert Half. An Equal Opportunity Employer. M/F/Disability/Veterans. By clicking "Apply Now," you're agreeing to Robert Half's Terms of Use and Privacy Notice.