Principal Engineer

Job ID: 113688
Location: St. Louis, Missouri  [Hybrid]
Category: Infrastructure
Employment Type: Contract
Date Added: 09/24/2026
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Role Summary
This role involves designing and implementing advanced network infrastructures to support enterprise-level operations. The candidate will provide technical leadership in routing, switching, load balancing, and application delivery, ensuring high performance, availability, and security. Focused on modernization initiatives, they will collaborate across teams to drive strategic improvements and oversee complex network migration and transformation projects.

Responsibilities

  • Architect and design high-performance, highly available network solutions utilizing Arista, Cisco, and F5 platforms.
  • Serve as the escalation point for advanced network and application delivery issues.
  • Develop and implement Layer 2–Layer 7 solutions, including routing, traffic engineering, and application delivery strategies.
  • Lead network modernization efforts, including automation, infrastructure as code, and observability enhancements.
  • Establish operational standards, reference architectures, and best practices for network management.
  • Collaborate with security, cloud, and infrastructure teams to ensure secure, scalable network design.
  • Evaluate emerging networking technologies and recommend adoption strategies.
  • Manage large-scale network migrations, upgrades, and data center transformations.
  • Mentor senior and mid-level engineers on troubleshooting, design, and operational best practices.
  • Participate in architectural review boards and strategic planning initiatives.

Qualifications

  • 10+ years of experience in network engineering or infrastructure architecture.
  • Expertise in Arista EOS, Cisco routing and switching, and F5 BIG-IP platforms.
  • Deep knowledge of BGP, OSPF, IS-IS, and advanced routing design.
  • Experience with spine-leaf and modern data center architectures, VXLAN/EVPN overlays, and high availability setups.
  • Strong troubleshooting skills in multi-vendor network environments.
  • Proven ability to design large-scale enterprise and service provider networks.
  • Excellent documentation and architectural design skills.
  • This position requires eligibility for a U.S. Government security clearance. In accordance with federal law, U.S. citizenship is required.
  • Active U.S. security clearance required, or the ability to obtain and maintain one (Top Secret/SCI with willingness to obtain a CI Polygraph).

Publishing Pay Range: $90.00 – $110.00 USD Hourly

This position is based in office and requires employee to work on-site.

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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