Senior F5 Engineer

Kforce's client in Englewood, CO is seeking a Senior F5 Engineer to support the design, engineering, and optimization of enterprise application delivery, traffic management, and web application security platforms. This individual will play a key role in maintaining highly available, secure, and high-performing infrastructure across a distributed, cloud-integrated enterprise environment. The Senior F5 Engineer will bring deep hands-on experience with F5 BIG-IP technologies while helping modernize traditional load-balancing and application delivery environments through automation, software-defined networking, and SaaS-based security solutions.

Key Responsibilities:

• Design, configure, administer, and optimize enterprise F5 BIG-IP environments, including LTM, DNS/GTM, and WAF/ASM modules
• Maintain the availability, performance, scalability, and resiliency of mission-critical application delivery platforms across hybrid and cloud environments
• Develop and implement automated monitoring, alerting, and troubleshooting processes to improve operational visibility and reduce mean time to resolution (MTTR)
• Develop, test, and troubleshoot custom F5 iRules using Tcl to support complex traffic management and application delivery requirements
• Configure, maintain, and optimize Web Application Firewall (WAF/ASM) policies to strengthen application security and protect enterprise traffic
• Manage SSL/TLS configurations, certificate lifecycles, and secure application connectivity
• Lead root cause analysis for critical P1/P2 incidents and recurring infrastructure issues, identifying permanent solutions
• Drive infrastructure automation initiatives using Python, Ansible, Git, and infrastructure-as-code practices
• Support the modernization of traditional F5 BIG-IP environments toward F5 Distributed Cloud and SaaS-based application delivery and security architectures
• Bachelor's degree in Computer Science, Computer Engineering, Information Technology, or a related technical field
• 5+ years of experience working in medium-to-large enterprise network or infrastructure environments
• Demonstrated hands-on experience administering, engineering, and optimizing enterprise F5 BIG-IP environments

Advanced knowledge of F5 BIG-IP technologies, including:

• Local Traffic Manager (LTM)
• DNS / Global Traffic Manager (GTM)
• Web Application Firewall (WAF/ASM)
• Load balancing and traffic management
• SSL/TLS offloading and certificate management
• Disaster recovery and business continuity
• Hands-on experience developing and troubleshooting F5 iRules using Tcl
• Experience configuring, maintaining, and tuning WAF/ASM security policies
• Familiarity with F5 Distributed Cloud and SaaS-based WAF/security solutions
• Experience with infrastructure automation and scripting tools, including Python, Ansible, and Git
• Strong understanding of networking fundamentals, including TCP/IP, HTTP/HTTPS, SSL/TLS, and DNS
• Experience troubleshooting complex network and application delivery issues using packet captures, tcpdump, Wireshark, SSL handshake analysis, and log aggregation tools

The pay range is the lowest to highest compensation we reasonably in good faith believe we would pay at posting for this role. We may ultimately pay more or less than this range. Employee pay is based on factors like relevant education, qualifications, certifications, experience, skills, seniority, location, performance, union contract and business needs. This range may be modified in the future.

We offer comprehensive benefits including medical/dental/vision insurance, HSA, FSA, 401(k), and life, disability & ADD insurance to eligible employees. Salaried personnel receive paid time off. Hourly employees are not eligible for paid time off unless required by law. Hourly employees on a Service Contract Act project are eligible for paid sick leave.

Note: Pay is not considered compensation until it is earned, vested and determinable. The amount and availability of any compensation remains in Kforce's sole discretion unless and until paid and may be modified in its discretion consistent with the law.

This job is not eligible for bonuses, incentives or commissions.

Kforce is an Equal Opportunity/Affirmative Action Employer. All qualified applicants will receive consideration for employment without regard to race, color, religion, sex, pregnancy, sexual orientation, gender identity, national origin, age, protected veteran status, or disability status.

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