Senior Network Engineer

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 world's 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. We've 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) platforms. In 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 world's real estate, empowering all people to discover properties, insights, and connections that improve their businesses and lives.

We are seeking a motivated and detail-oriented Senior Network Engineer to join our growing IT Infrastructure team. This role is ideal for candidates with 8+ years of total IT experience, including 5-6 years of hands-on networking experience. You'll 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

• Bachelor's 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 supporting enterprise Wi-Fi and 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 with ticketing systems and 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