XPT Software Australia Pty Ltd

L3 Support Engineer DNS

Posted Yesterday

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Sydney, New South Wales, AUS

In-Office

Senior level

Information Technology • Software • Consulting

The Role

Provides L3 escalation support for production DNS infrastructure. Diagnoses critical outages, performance degradation, security issues, and protocol-level problems across authoritative and recursive DNS systems. Performs deep BIND troubleshooting, analyzes DNS resolution behavior, leads root cause analysis for major incidents, and collaborates with L1/L2 support, NOC, and network teams to restore services quickly.

Summary Generated by Built In

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

Skills Required

5+ years of experience in DNS operations and support
2–3 years of experience at the L3 support level
Hands-on experience with BIND
Deep understanding of DNS protocol internals
Understanding of authoritative and recursive DNS
Understanding of TTL, caching behavior, and query resolution flow
Strong Linux/Unix system administration experience
Strong TCP/IP and UDP networking fundamentals
Understanding of latency and routing behavior
Experience with Anycast DNS deployments
Exposure to Unbound, PowerDNS, or Knot DNS
Automation and scripting experience with Shell, Python, or Ansible
Experience with Prometheus, Grafana, Nagios, or Zabbix
ITIL incident, problem, and change management experience
DNS protocol-level analysis experience
Root cause analysis experience for major incidents

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The Company

120 Employees

Year Founded: 2016

What We Do

XPT Software Australia Pty Ltd is a technology consulting and software services company serving clients across banking, financial services and insurance, telecommunications, mining, retail, energy, and manufacturing. It provides software development, IT management consulting, business analysis, project and program management, infrastructure support, and offshore development through onsite-offshore delivery. The company also works with cloud computing, big data, mobile applications, UI/UX, algorithms, and IoT.