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