L3 Support Engineer DNS

Must Have Skills:

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
• Authoritative vs Recursive DNS
• TTL, caching behavior, and query resolution flow

Strong Linux/Unix system administration experience

Strong networking fundamentals:

• TCP/IP, UDP
• Latency and routing behavior

Nice to Have Skills:

• 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)

Minimum Years of Experience:

5+

Certifications Needed:

No

Top 3 responsibilities you would expect the Subcon to shoulder and execute

• Act as L3 escalation point for complex DNS incidents impacting production services
• Diagnose and resolve critical DNS outages, performance degradation, and security issues
• Provide expert support for authoritative and recursive DNS infrastructures
• Work closely with L1/L2 teams, NOC, and Core Network teams to restore services quickly
• Deep troubleshooting of BIND
• Perform DNS protocol‑level analysis
• Lead root cause analysis (RCA) for major incidents