Job Description

Senior Network Engineer (Load Balancing / DDI)

Location: Phoenix, AZ or Columbus, OH
Employment Type: 12-Month Contract-to-Hire
Industry: Financial Services / Banking

Overview

A leading financial services organization is seeking a Senior Network Engineer to support enterprise-scale application delivery, load balancing, and DDI (DNS, DHCP, IPAM) initiatives.

This role is heavily focused on design and architecture, with hands-on engineering across F5, Infoblox, and cloud platforms (AWS/Azure). You’ll play a key role in modernizing application delivery, enabling hybrid cloud strategies, and ensuring high availability and security across critical infrastructure.

Key Responsibilities

Solution Design & Architecture

• Design high-availability, scalable, and secure load balancing and DDI architectures
• Develop standardized designs for:
  • Application delivery (L4/L7)
  • Global traffic management (GSLB)
  • DNS (authoritative & recursive)
  • IPAM and DHCP services
• Create high-level and low-level design documentation aligned with enterprise standards
• Evaluate and recommend technology upgrades and architectural improvements

Load Balancing Engineering

• Design and deploy solutions using:
  • F5 BIG-IP (LTM, DNS/GTM, ASM)
  • Azure Load Balancer, Application Gateway, Front Door
  • AWS ELB (ALB, NLB, GWLB)
• Implement:
  • SSL/TLS offloading and re-encryption
  • Traffic steering, content switching, and persistence
  • Advanced health monitoring and policy logic (iRules)
• Support application onboarding, migrations, and modernization efforts

DDI Engineering (DNS, DHCP, IPAM)

• Design and deploy DDI platforms using:
  • Infoblox (Grid, DNS, DHCP, IPAM)
  • F5 DNS / GTM
  • Cloudflare DNS & security services
• Architect DNS across:
  • On-prem data centers
  • Cloud and hybrid environments
  • Global/external resolution services
• Ensure high availability, low latency, and secure DNS architecture
• Maintain IPAM integrity and integration with automation tools

Cloud & Hybrid Integration

• Architect and deploy solutions in AWS and Azure
• Support:
  • Hybrid application delivery
  • Cloud migrations and re-platforming
  • Multi-region failover and GSLB strategies
• Ensure consistency across environments while leveraging native cloud capabilities

Deployment & Implementation

• Lead complex implementations, migrations, and upgrades
• Develop:
  • Deployment and change plans
  • Rollback strategies
  • Validation procedures
• Execute configuration, testing, and cutovers with minimal disruption
• Ensure smooth transition to operations with documentation and knowledge transfer

Security, Compliance & Resilience

• Design solutions aligned with enterprise security and regulatory standards
• Integrate with:
  • TLS and certificate management
  • DDoS protection
  • Traffic inspection and security tooling
• Support audits through technical documentation and design artifacts

Collaboration & Technical Leadership

• Partner with:
  • Application teams
  • Cloud engineering
  • Security architecture
  • Network operations
• Act as technical escalation point for complex issues
• Mentor junior engineers and contribute to best practices

Documentation & Standards

• Produce and maintain:
  • Architecture diagrams
  • Design specifications
  • Engineering standards and templates
  • Implementation and operational documentation
• Contribute to enterprise standards for application delivery and DDI

Key Deliverables

• High-level and low-level design documentation
• Standardized load balancing and DDI architectures
• Fully deployed and validated solutions
• DNS, DHCP, and IPAM service designs
• Deployment plans and operational handoff materials

Required Qualifications

• 7+ years of experience in network engineering or application delivery
• Strong hands-on experience with:
  • F5 BIG-IP (LTM, GTM/DNS)
  • Infoblox DDI (DNS, DHCP, IPAM)
• Experience with AWS and/or Azure networking services
• Deep understanding of:
  • DNS architecture (authoritative & recursive)
  • Load balancing concepts (L4/L7, GSLB)
  • High availability and failover design
• Experience in enterprise or highly regulated environments (financial services preferred)

Preferred Qualifications

• Experience with Cloudflare DNS / security services
• Scripting/automation experience (Python, Ansible, Terraform, etc.)
• Relevant certifications (F5, AWS, Azure, CCNP, etc.)