Senior Network Engineer

CoStar Group, US-DC Washington DC

Work at CoStar Group

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 S&P 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.   

We are looking for a Senior Network Engineer to join our large team of expert engineers to manage and support the CoStar Group network backbone that spans multiple active global private and public datacenters, 80+ offices. The Senior Network Engineer is also responsible for supporting the availability of web applications like &, which are visited by millions of customers every day.

This position can be located in Washington, DC or Richmond, VA and offers the a hybrid schedule of 3 days onsite, 2 days remote.


  • Design and implement network tools and solutions comprising 600 physical network appliances including routers, switches, firewalls, load balancers and VPN’s
  • Provide network support operations as a player and coach in collaboration with >200 operations engineers spanning NetOps, DevOps, DBOps, SysOps, SecOps, DevSecOps, and ServiceDesk. Support tickets in relation to datacenters, internet applications, and worldwide office connectivity.
  • Optimize and implement routing, switching, firewall, and load balancing enhancements for 50 market leading Internet sites that serve millions of visitors.
  • Secure and manage over 80 worldwide office locations supporting both onsite and remote users.
  • Implement and support cloud networking including Amazon Direct Connect, AWS VPC, Azure ExpressRoute, AWS, Azure, Google Cloud, Akamai, CloudFlare
  • Implement and support Software Defined Networking (SDN) – Cisco ACI, Aporeto, Terraform, Meraki
  • Work with various networking technologies including but not limited to:
    • Firewalls –CheckPoint, Juniper, AWS Security Groups
    • Cisco Nexus switches – 9Ks, 7Ks, 5Ks, 3Ks, FEXs
    • Load balancers and traffic managers – F5 BIGIP LTM and GTM, Akamai
    • SSL VPN solutions – Palo Alto, Junos Pulse, CheckPoint, Microsoft Direct Access

Basic Qualifications

  • Bachelor’s Degree (preferably in Computer Science or related field)
  • Minimum 5+ years of relevant experience in networking not limited to: TCP/IP, BGP, OSPF, QoS, SNMP, VoIP, Firewalling, Load Balancing, Wireless, ACI, Python

Preferred Qualifications And Skills

  • One or more relevant certifications such as PCNSE, PCSNA, CCNA, CCNP, CCIE, CCSA, CCSE, etc.
  • Supporting enterprise wi-fi over LAN and WAN environments (preferably Aruba)
  • Installing, configuring, and troubleshooting Cisco network devices.
  • Working in environments with >5,000 end points (VMs, workstations, etc)
  • Experience with internal and external DNS and global DNS
  • Experience with IP Address Management (IPAM) systems such as InfoBlox, Solarwinds, etc.
  • Experience with monitoring tools such as Solarwinds, AppDynamics, Nagios, Data Dog, PRTG
  • Experience in local and global traffic management and load balancing solutions such as F5
  • Network security experience including device hardening, IDS/IPS, SIEM, Firewalls, IPSec, vulnerability assessment and intrusion detection.
  • Experience in network protocol analyzers/sniffers.
  • Knowledge of all types of circuits – P2P, Dark and Lit Fiber, MPLS, WAN, MAN, PRIs
  • Knowledge of heterogeneous networking components along with in depth knowledge of routing/ switching.

What’s in it for You

When you join CoStar Group, you’ll experience a collaborative and innovative culture working alongside the best and brightest to empower our people and customers to succeed.

We offer you generous compensation and performance-based incentives. CoStar Group also invests in your professional and academic growth with internal training, tuition reimbursement, and an inter-office exchange program.

Our benefits package includes (but is not limited to):

  • Comprehensive healthcare coverage: Medical / Vision / Dental / Prescription Drug
  • Life, legal, and supplementary insurance
  • Virtual and in person mental health counseling services for individuals and family
  • Commuter and parking benefits
  • 401(K) retirement plan with matching contributions
  • Employee stock purchase plan
  • Paid time off
  • Tuition reimbursement
  • On-site fitness center and/or reimbursed fitness center membership costs (location dependent), with yoga studio, Pelotons, personal training, group exercise classes
  • Access to CoStar Group’s Diversity, Equity, & Inclusion Employee Resource Groups
  • Complimentary gourmet coffee, tea, hot chocolate, fresh fruit, and other healthy snacks

We welcome all qualified candidates who are currently eligible to work full-time in the United States to apply.  However, please note that CoStar Group is not able to provide visa sponsorship for this position.



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

About CoStar Group

CoStar Group is the leading provider of online real estate marketplaces, information, and analytics in the commercial and residential property markets.

CoStar Group

Want to learn more about CoStar Group? Visit CoStar Group's website.