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F5 Network Engineer

Texas State Library and Archives Commision

Katy, TX

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JOB DETAILS
SKILLS
Analysis Skills, Ansible, Bash Scripting, Citrix Product Family, Cloud Computing, DNS (Domain Name System), Data Collection, Digital Certificates, F5 BIG-IP, F5 Network Software, Failover, HTTP (HyperText Transport Protocol), Hardware Virtualization, High Availability, High Level Architecture (HLA), IP (Internet Protocol), Identify Issues, Intrusion Prevention Systems, Leadership, Licensing, Load Balancing, Low-Level Design, Network Architecture/Engineering, Network Operations Center, Open Systems Interconnection (OSI), Policy Development, Project Lifecycle, Python Programming/Scripting Language, SSL-TLS (Secure Socket Layer - Transport Layer Security), Scripting (Scripting Languages), Software Porting, Systems Administration/Management, TCP (Transmission Control Protocol), TCP/IP (Transmission Control Protocol/Internet Protocol), Tcl-Tk, Technical Leadership, Test Plan/Schedule, Transportation and Traffic Design, Wireshark (Ethereal), tcpdump
LOCATION
Katy, TX
POSTED
Today
Role Overview

As a Senior F5 Engineer, you will lead the architecture, engineering, and migration of complex application delivery solutions. The primary focus of this role is the large-scale migration of legacy Citrix NetScaler environments to F5 BIG-IP (LTM/GTM). You will be responsible for the full lifecycle of the project, from initial data gathering and High-Level Design (HLD) to hands-on implementation and post-migration troubleshooting.
Key Responsibilities
  • Design & Architecture: Develop High-Level (HLD) and Low-Level Designs (LLD) for F5 LTM and GTM/DNS infrastructure across multi-site data centers.
  • NetScaler to F5 Migration: Lead the technical conversion of NetScaler configurations (Virtual Servers, Service Groups, Policies) into F5 BIG-IP equivalents (VIPs, Pools, iRules).
  • Traffic Management: Design and implement intelligent traffic steering using F5 GTM (Global Traffic Manager)and complex load balancing logic via LTM (Local Traffic Manager).
  • Programmability: Write, test, and deploy advanced iRules (TCL-based) to handle header manipulation, URI switching, and custom persistence requirements that were previously handled by NetScaler policies.
  • Lifecycle Management: Manage F5 hardware/virtual platforms (Viprion, iSeries, or rSeries) and perform OS upgrades, licensing, and vCMP guest provisioning.
  • Security Integration: Configure SSL offloading, certificate management, and basic security profiles (WAF/ASM integration is a plus).
  • Stakeholder Collaboration: Work with application owners to understand traffic flows and requirements, ensuring zero-downtime migrations through meticulous cutover planning.
Technical Skills & Qualifications
1. Core F5 Expertise
  • F5 BIG-IP LTM: Expert knowledge of Profiles (TCP, HTTP, SSL), Persistence (Cookie, Source-IP), Monitors, and SNAT.
  • F5 BIG-IP GTM/DNS: Experience with Wide-IPs, Distributed Cloud/Global Server Load Balancing (GSLB), and iQuery communication.
  • iRules Development: Proficiency in writing custom scripts to solve complex traffic steering challenges.
  • Platform Mastery: Hands-on experience with vCMP (Virtual Clustered Multiprocessing) and high-availability (HA) failover clusters.
2. Migration Specifics
  • NetScaler Proficiency: Strong understanding of Citrix ADC/NetScaler concepts (Content Switching, Responder/Rewrite policies, AppExpert) to effectively map them to F5.
  • Migration Tools: Familiarity with manual conversion methods or automation scripts (Python/Ansible) to expedite configuration porting.
3. Network & Troubleshooting
  • Protocol Depth: Deep understanding of the OSI model, specifically TCP/IP, HTTP/S, DNS, and SSL/TLS.
  • Tools: Expert-level use of Tcpdump, Wireshark, and F5's internal bash and tmsh shells for deep packet analysis.
Experience & Education
  • Experience: 6-8 years in Network Engineering, with at least 4+ years dedicated strictly to F5/ADC technologies.
  • Proven Track Record: At least one major migration project (NetScaler to F5 or vice-versa) successfully delivered.
  • Certifications: F5 Certified Technology Specialist (LTM/GTM) or F5 Certified Solution Expert (preferred).
Soft Skills
  • Analytical Thinking: Ability to decompose complex legacy NetScaler policies into clean, efficient F5 logic.
  • Communication: Able to explain technical migration risks to non-technical business stakeholders.
  • Project Leadership: Experience leading technical workstreams within a larger infrastructure transformation program.

About the Company

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Texas State Library and Archives Commision