Senior Network Engineer

Job Description

CoStar Group (NASDAQ: CSGP) is a leading global provider of commercial and residential real estate information analytics and online marketplaces. Included in the SCP 500 Index and the NASDAQ 100 CoStar Group is on a mission to digitize the worlds real estate empowering all people to discover properties insights and connections that improve their businesses and lives.

We have been living and breathing the world of real estate information and online marketplaces for over 35 years giving us the perspective to create truly unique and valuable offerings to our customers. Weve continually refined transformed and perfected our approach to our business creating a language that has become standard in our industry for our customers and even our competitors. We continue that effort today and are always working to improve and drive innovation. This is how we deliver for our customers our employees and investors. By equipping the brightest minds with the best resources available we provide an invaluable edge in real estate.

Domain is a leading property technology and services marketplace that is home to one of the largest portfolios of property brands in Australia including the Domain Allhomes and Commercial Real Estate (CRE) 2025 Domain became part of CoStar Group (NASDAQ: CSGP) a global leader in commercial real estate information analytics online marketplaces and 3D digital twin technology. Together Domain and CoStar Group is dedicated to digitising the worlds real estate empowering all people to discover properties insights and connections that improve their businesses and lives.

We are seeking a motivated and detail-orientedSenior Network Engineer to join our growing IT Infrastructure team. This role is ideal for candidates with8 years of total IT experience including5-6 years of hands-on networking experience. Youll work alongside a team of experienced engineers to support and maintain our global network infrastructure which spans multiple data centers and 75 office locations.

This role is a great opportunity for someone looking to deepen their networking skills in a complex enterprise-scale environment while contributing to the performance and reliability of high-traffic platforms.

Responsibilities

• Own the installation monitoring maintenance and support of enterprise network infrastructure including switches firewalls wireless access points and SD-WAN appliances.
• Serve as an escalation point for complex (L3) network incidents; drive triage containment root-cause analysis and corrective/preventative actions.
• Participate in an on-call rotation to support 24x7 network operations; lead incident response stakeholder communications and post-incident reviews to prevent recurrence.
• Lead hands-on office and data center network deployments upgrades and troubleshooting across global locations ensuring consistent standards and repeatable outcomes.
• Create implementation plans for network changes (scope risk validation and rollback) and execute changes during approved maintenance windows.
• Maintain high-quality network documentation (diagrams configs standards runbooks) that enables reliable operations and effective on-call response.
• Partner with NetOps DevOps Security and Service Desk to resolve incidents quickly reduce repeat issues and continuously improve network availability and performance.
• Proactively identify risk and performance issues through monitoring log analysis and trend review; drive remediation to prevent outages and reduce alert noise.
• Act as a hands-on operator/SME for enterprise networking technologies including (but not limited to):
  • Firewalls Palo Alto
  • SDWAN Palo Alto Prisma
  • Cisco Catalyst switches
  • Wireless Aruba controllers and access points Clearpass
  • SASE Zscaler
  • IPAM Infoblox
  • Network Management LogicMonitor OpenText HPE UXI
  • SIEM Azure Log Analytics

Qualifications

• Bachelors degree from an accredited not-for-profit university or college (preferably in Computer Science or a related field) or equivalent practical experience.

• 8 years of hands-on experience supporting and operating enterprise network infrastructure (LAN/WAN/WLAN and security).
• Deep expertise in core networking technologies including TCP/IP DNS DHCP VLANs routing/switching fundamentals and secure VPN architectures.
• Extensive hands-on experience operating enterprise networking platforms including Cisco (switching) Aruba (wireless/NAC) Palo Alto (firewalls/Prisma SD-WAN) and equivalent technologies.
• Proven methodical troubleshooting skills for complex enterprise network issues including clear incident documentation root-cause analysis and preventative follow-up.
• Demonstrated ability to work autonomously prioritize competing work and take end-to-end ownership of production issues to resolution.

Preferred Qualifications and Skills

• One or more relevant certifications (e.g. CCNP/CCNA Aruba ACMP/ACMA Palo Alto PCNSE or equivalent).
• Experience supportingenterprise Wi-Fiand LAN/WAN environments.
• Experience operating network monitoring/observability platforms (e.g. LogicMonitor PRTG SolarWinds) including alert tuning dashboards and proactive health reporting.
• Familiarity with hybrid connectivity and cloud networking concepts (AWS/Azure) including VPN connectivity routing and security controls.
• Experience with Zero Trust Network Access (ZTNA) / secure access solutions (e.g. Zscaler Netskope Cloudflare Cato Networks).
• Experience working in environments withticketing systemsand change management processes.
• Experience writing scripts in Python and/or implementing Ansible in an enterprise environment (automation validation or configuration management).

CoStar Group is an Equal Employment Opportunity Employer; we maintain a drug-free workplace and perform pre-employment substance abuse testing