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