L3 Support Engineer DNS
On-siteSydney, New South Wales, Australia
Job Summary
Act as the L3 escalation point for complex DNS incidents impacting production services, diagnosing and resolving critical outages, performance degradation, and security issues. Provide expert support for authoritative and recursive DNS infrastructures while performing deep troubleshooting of BIND, conducting protocol-level analysis, and leading root cause analysis for major incidents. Collaborate closely with L1/L2 teams, NOC, and Core Network teams to restore services quickly. Requires 5+ years of DNS operations experience, strong BIND and Linux administration skills, and deep understanding of DNS protocol internals, TTL, and caching behavior.
Required Qualifications
- 5+ years of experience in DNS operations/support, with at least 2–3 years at L3 level
- Strong hands‐on experience with BIND (open‐source DNS)
- Deep understanding of DNS protocol internals
- Deep understanding of Authoritative vs Recursive DNS
- Deep understanding of TTL, caching behavior, and query resolution flow
- Strong Linux/Unix system administration experience
- Strong networking fundamentals: TCP/IP, UDP
- Strong networking fundamentals: Latency and routing behavior
- 5+ years of experience
Desired Qualifications
- Experience with Anycast DNS deployments
- Exposure to other DNS software: Unbound, PowerDNS, Knot DNS
- Automation and scripting (Shell, Python, Ansible)
- Monitoring tools: Prometheus, Grafana, Nagios, Zabbix
- ITIL processes (Incident, Problem, Change Management experience)
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