On Call Python Network Programming Jobs in Phoenix, AZ

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.).