Senior F5 Engineer

Job ID: 111471
Location: St. Louis, Missouri  [Flex]
Category: Infrastructure
Employment Type: Contract
Date Added: 02/02/2026
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Join our team as a Senior F5 Engineer and play a pivotal role in ensuring the high availability, security, and scalability of mission-critical applications across diverse infrastructure environments. This is an exciting opportunity for a seasoned professional to lead advanced application delivery projects, optimize hybrid cloud architectures, and drive automation initiatives in a collaborative, innovative setting.

Key Responsibilities:

  • Design, implement, and fine-tune F5 BIG-IP solutions, including LTM, GTM/DNS, ASM, and APM modules, across both production and development environments, ensuring optimal performance and security.
  • Lead the automation of configuration management and deployment processes using tools such as Python, Ansible, and Terraform, promoting consistency and operational excellence.
  • Develop custom iRules and iApps to support advanced application delivery logic, integrations, and security policies tailored to enterprise needs.
  • Collaborate with security teams to enforce policies, manage SSL certificates, and integrate F5 appliances with identity and access management systems such as Okta and Azure AD.
  • Troubleshoot and resolve complex Layer 4–7 traffic and application issues utilizing F5 diagnostics, packet captures, and log analysis.
  • Integrate F5 solutions within hybrid and multi-cloud environments, including AWS, Azure, and GCP, aligning with company cloud strategies.
  • Manage the lifecycle of F5 devices through firmware updates, patches, hardware refreshes, and performance tuning.
  • Create comprehensive documentation, runbooks, and operational standards to support global support teams and ensure continuous operational stability.
  • Mentor and guide junior engineers, sharing best practices in automation, security, and application delivery.

Qualifications:

  • Bachelor’s degree in Computer Science, Information Technology, or a related field; equivalent practical experience will also be considered.
  • 8+ years of hands-on experience managing and engineering F5 BIG-IP systems within large enterprise settings.
  • Expertise in F5 modules: LTM, GTM/DNS, ASM, and APM.
  • Strong scripting and automation skills with Python, Bash, Ansible, or similar tools.
  • Deep understanding of networking protocols such as TCP/IP, HTTP/S, DNS, SSL, VLANs, and routing.
  • Proven experience with integrating F5 solutions into cloud environments (AWS, Azure, GCP) and other proxy solutions.
  • Excellent problem-solving skills to troubleshoot multi-layer traffic and application delivery challenges.
  • Effective communicator with stellar documentation skills, comfortable working within a global, cross-functional team.

Preferred Qualifications:

  • Certification as an F5 Certified Technology Specialist (LTM, ASM, APM, or GTM).
  • Knowledge of Zero Trust architecture and API gateway integrations.
  • Familiarity with Kubernetes ingress controllers, NGINX+, and other ADC technologies.
  • Experience supporting manufacturing or engineering workloads in high-availability environments.
  • Previous engagement with Fortune 500 or semiconductor enterprises is a plus.
Publishing Pay Rate: $100.00 – $110.00 Hourly

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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