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