F5 Network Engineer - TS/SCI with Polygraph

Req ID: RQ219430

Type of Requisition: Regular

Clearance Level Must Be Able to Obtain: Top Secret SCI + Polygraph

Public Trust/Other Required: None

Job Family: IT Infrastructure and Operations

Skills:

BIG IP LTM,Enterprise IT,F5 BIG-IP,TCPIP Network,Traffic Management

Experience:

10 + years of related experience

US Citizenship Required:

Yes

Job Description:

F5 NETWORK ENGINEER

YOUR IMPACT

Own your opportunity to support national defense. Your work will help keep critical operations secure and connected across the global enterprise directly, contributing to a mission that protects our nation every day.

CIS is growing, and we invite both our experienced incumbents and new team members to be part of what's next. Incumbents bring invaluable mission insight, while new talent adds fresh ideas and energy. Together, we'll strengthen continuity and drive the next generation of innovation.

MEANINGFUL WORK AND PERSONAL IMPACT

As an F5 Network Engineer supporting CIS, you will design, secure, and sustain advanced application delivery and traffic management services across multiple enterprise networks. You will maintain highly available F5 load balancing environments, enforce secure configuration baselines, and deliver resilient access to mission critical applications. Your expertise directly enhances network performance, strengthens cybersecurity posture, and ensures the reliable delivery of core IT capabilities.

KEY RESPONSIBILITIES:

• Administer, configure, and optimize F5 BIG-IP platforms including LTM, GTM/DNS, ASM, APM, and VIPRION/VE components to support scalable and resilient application delivery

• Develop and tune traffic management profiles, SSL/TLS offload configurations, iRules/iApps, and advanced routing policies to ensure consistent service performance

• Monitor health, performance, and capacity of F5 appliances and virtual editions, proactively identifying opportunities to enhance throughput, resilience, and efficiency

• Implement secure configuration baselines, system hardening, and STIG aligned controls across all F5 devices and supporting infrastructure

• Execute timely patching, firmware updates, and security fixes for F5 platforms through approved deployment and compliance technologies

• Review weekly compliance and vulnerability scan results, identify noncompliant configurations, determine root causes, and drive remediation actions

• Track and apply approved security directives, task orders, and vulnerability notifications affecting load balancers, proxies, SSL/TLS services, and related network security functions

• Provide Tier 3 escalation support for complex application delivery issues including SSL negotiation, traffic flow, availability failures, and performance bottlenecks

• Collaborate with engineering, cybersecurity, networking, and operations teams to integrate new applications, validate secure designs, and support accreditation activities

• Maintain accurate documentation of configurations, patch schedules, certificates, iRules, and operational procedures to support audit readiness and change control

WHAT YOU'LL NEED TO SUCCEED :

• EDUCATION: Bachelor's degree in an IT-related field, 12+ years of relevant IT experience in lieu of a degree

• CERTIFICATION: Meet DoD 8140 Information Assurance Workforce certification requirements (e.g. Security+ CE, etc.)

• ADDITIONAL REQUIRED CERTIFICATION: - Vendor-Specific (e.g. F5 Certified Technology Specialist, BIG-IP LTM (F5-CTS, LTM))

• CLEARANCE: Active TS/SCI clearance with a favorable polygraph

• Hands-on experience administering and supporting F5 BIG-IP platforms in an enterprise environment (LTM, GTM/DNS, ASM, APM)

• Strong understanding of TCP/IP networking, SSL/TLS, load balancing methodologies, traffic management concepts, and secure network design principles

• Experience with patch management, system hardening, vulnerability remediation, and compliance reporting for network infrastructure or security appliances

• Strong analytical, documentation, and cross team communication skills

• US citizenship required

• LOCATION: Onsite

GDIT IS YOUR PLACE

At GDIT, the mission is our purpose, and our people are at the center of everything we do.

Growth: AI-powered career tool that identifies career steps and learning opportunities

Support: An internal mobility team focused on helping you achieve your career goals

Rewards: Comprehensive benefits and wellness packages, 401K with company match, and competitive pay and paid time off

Community: Award-winning culture of innovation and a military-friendly workplace

OWN YOUR OPPORTUNITY

Explore an enterprise IT career at GDIT and you'll find endless opportunities to grow alongside colleagues who share your desire to drive operations forward.

#CIS

The likely salary range for this position is $147,292 - $199,278. This is not, however, a guarantee of compensation or salary. Rather, salary will be set based on experience, geographic location and possibly contractual requirements and could fall outside of this range.

Our benefits package for all US-based employees includes a variety of medical plan options, some with Health Savings Accounts, dental plan options, a vision plan, and a 401(k) plan offering the ability to contribute both pre and post-tax dollars up to the IRS annual limits and receive a company match. To encourage work/life balance, GDIT offers employees full flex work weeks where possible and a variety of paid time off plans, including vacation, sick and personal time, holidays, paid parental, military, bereavement and jury duty leave. To ensure our employees are able to protect their income, other offerings such as short and long-term disability benefits, life, accidental death and dismemberment, personal accident, critical illness and business travel and accident insurance are provided or available. We regularly review our Total Rewards package to ensure our offerings are competitive and reflect what our employees have told us they value most.

We are GDIT. A global technology and professional services company that delivers consulting, technology and mission services to every major agency across the U.S. government, defense and intelligence community. Our 26,000 experts extract the power of technology to create immediate value and deliver solutions at the edge of innovation. We operate across 50 countries worldwide, offering leading capabilities in digital modernization, AI/ML, Cloud, Cyber and application development. Together with our clients, we strive to create a safer, smarter world by harnessing the power of deep expertise and advanced technology.

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Equal Opportunity Employer / Individuals with Disabilities / Protected Veterans