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