Senior Infrastructure & Cybersecurity SME

Job ID: 113263
Location: St. Louis, Missouri  [Remote]
Category: Infrastructure
Employment Type: Contract
Date Added: 08/07/2026
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Role Summary
A Senior Infrastructure & Cybersecurity Subject Matter Expert (SME) is responsible for providing advanced technical expertise in enterprise networking, virtualization, and cybersecurity within highly regulated environments. This role involves supporting critical IT modernization projects, ensuring compliance with federal standards, and guiding infrastructure upgrades to meet security and operational best practices.

Responsibilities

  • Support VMware/Omnissa VDI environments, including Windows 10 to Windows 11 migrations and optimization of golden images.
  • Perform troubleshooting, performance tuning, and security hardening of VDI solutions.
  • Support and maintain VMware technologies such as vSphere, VMware Cloud Foundation (VCF), Aria Operations, and NSX.
  • Assist with virtual machine migrations and modernization initiatives for virtualization environments.
  • Design, implement, and troubleshoot enterprise network architecture using Cisco technologies, including Catalyst, Nexus, ASR, ISR, Meraki, and Cisco ISE.
  • Support network redesign efforts, switch normalization, and security enhancements based on industry and federal best practices.
  • Implement DISA STIG requirements, assist with cybersecurity compliance, and support Authority to Operate (ATO) initiatives.
  • Conduct security assessments and develop remediation strategies to maintain cybersecurity posture.
  • Support Windows Server 2022 upgrades, Windows 11 optimization, Group Policy management, and LAPS deployment.
  • Serve as a technical advisor, providing mentoring, knowledge transfer, and best-practice recommendations to engineering teams and stakeholders.

Qualifications

  • 8+ years of experience in enterprise IT infrastructure within federal, DoD, or regulated environments.
  • Hands-on experience with VMware/Omnissa VDI environments, including Horizon, golden images, migrations, and performance optimization.
  • Strong background in VMware virtualization and enterprise networking, with proficiency in Cisco networking and security technologies.
  • Experience supporting DISA STIG implementation and cybersecurity compliance initiatives.
  • Excellent troubleshooting, communication, and customer-facing skills.
  • Working knowledge of Windows Server 2022, Windows 11, Group Policy, and LAPS deployment.
  • Ability to support zero-trust security architectures and secure infrastructure design.
  • This position requires eligibility for a U.S. Government security clearance. In accordance with federal law, U.S. citizenship is required.
  • Relevant VMware or Cisco certifications preferred.
  • Experience with Cisco ISE, Zero Trust architecture, and enterprise security solutions is advantageous.

Publishing Pay Range: $70.00 – $80.00 USD Hourly
This is a fully remote role and can be performed from an approved location.

About GDH:
At GDH, we believe in the power of people and the importance of caring. Our culture statement, “We care about people,” isn’t just a tagline – it’s the core of everything we do. GDH is a premier staffing and talent solutions company dedicated to helping businesses find the best talent and assisting job seekers in finding their dream jobs.

Who We Are:
GDH, founded in 2001, has grown into a leader in providing staffing solutions across various industries. We specialize in IT across several sectors, connecting top talent with leading enterprises. As a Best of Staffing firm recognized for excellence in client, employee, talent, and women’s services, we pride ourselves on our commitment to quality and service.

GDH Benefits

GDH offers a range of employee benefits that are designed to promote well-being and help maintain a healthy work-life balance. These comprehensive benefits cover various aspects of an employee’s life and aim to enhance their overall experience with the company. Our health benefits include three medical insurance options with access to KISx Card, Zero Card, and HealthJoy concierge services. Other plan offerings include dental, vision, life, disability, supplemental insurance, and pet insurance plans. Enjoy additional perks like holiday pay, 401(k) plan, direct deposit, an employee referral program, work-life balance benefits, a Wellbeats membership, a discounted gym membership program, and more!  For more detailed information on benefits, please go to GDH’s website under the tab for candidates.

GDH provides equal employment opportunities (EEO) to all employees and applicants for employment and prohibits discrimination and harassment of any type without regard to race, color, religion, gender, sex (including pregnancy), sexual orientation, gender identity, national origin, age, disability, genetic information, marital status, ancestry, protected veteran status, military or uniformed service member status, or any other status or characteristic protected by applicable federal, state, and local laws. Applicants with disabilities who require an accommodation or assistance in applying and/or for interviewing, please contact our HR Department.

Please visit our notice of collection for California applicants.

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