Operate and enhance enterprise DNS/DHCP/IPAM (Infoblox), including zone management, delegation, views, forwarding/conditional forwarding, DNSSEC where applicable, and DHCP scope design, policy, and reservations.

Configure and maintain F5 GTM (BIG-IP DNS) for global server load-balancing (GSLB): wide IPs, pools, health monitors, topology/geo-based steering, and disaster-recovery failover.

Provide operational support for ProofPoint SMTP mail relays within Mastercard’s production environment, including diagnosing mail delivery delays, troubleshooting failed deliveries, and assisting application teams experiencing email-related impact.

Upgrade, patch, and maintain ProofPoint mail relay nodes; manage SSL/TLS certificate installations and renewals on relay infrastructure.

Partner with application, security, and platform teams to align mail relay operations with enterprise email delivery standards and compliance requirements.

Perform root-cause analysis and triage of incidents affecting DNS/DHCP/GTM or SMTP relays; drive swift mitigation and durable corrective actions within strict SLAs.

Implement automation and Infrastructure-as-Code (e.g., Terraform/Ansible/REST APIs) for repeatable changes, compliance evidence, and configuration drift control.

Maintain strong operational hygiene: monitoring/alerting dashboards, capacity and growth planning (zones, records, leases), backup/restore, and change governance (CRQs).

Create clear runbooks/SOPs and provide knowledge sharing to peers and partner teams.

Participate in an on-call rotation providing operational support for DNS/DHCP/GTM and mail relay services.

All About You
You have:

Hands-on expertise administering enterprise DNS/DHCP/IPAM platforms (Infoblox strongly preferred), including advanced features such as DNS views, RPZ, TSIG/AXFR/IXFR, and DHCP failover.

Experience managing ProofPoint SMTP relays or similar enterprise mail relay solutions in a production environment, including diagnostics of mail flow issues and server health.

Familiarity with TLS certificates for SMTP, including install, renewal, and associated DNS challenge records (e.g., ACME/DNS-01).

Working knowledge of F5 GTM (BIG-IP DNS) concepts: wide IPs, pools, monitors, topology-based load-balancing, GTM/LTM integration, and DR patterns.

Solid troubleshooting across TCP/IP, routing fundamentals, Anycast, SMTP, recursive vs. authoritative DNS, caching/TTL strategy, and client behavior (Windows/Linux).

Experience building automation for network and mail relay services (Terraform, Ansible, Python/PowerShell, and REST APIs).

Strong communication skills to explain complex issues to both technical and non-technical stakeholders; a bias for documentation and operational excellence.

Curiosity and initiative to learn, mentor, and continuously improve systems and processes.