CoStar Group is looking for a Network Security Engineer in Washington – Apply Here!

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Senior Network Security Engineer

Job Description

Senior Network Security Engineer – Washington, DC or Richmond, VA

CoStar builds and operates over 50 websites serving 85 million site visitors each month. We have over 5000 employees across the world working to deliver comprehensive, timely and standardized real estate information. Some of our popular consumer-focused web sites include and


We are looking for an enthusiastic Senior Network Security Engineer to help champion our information security posture across CoStar’s networking stack. You will engage with all departments of The CoStar Group helping drive and shape the way we manage the protection of our customers and our ever-growing data environment. We’re looking for someone who can communicate and reinforce security concepts to technical and non-technical.

The ideal candidate will have experience engineering and operating secure networks – both in the cloud and 1st party data centers – for both office WAN and product networking environments. The successful candidate will be intrinsically motivated to learn new technologies and tools to move security forward as it is implemented within the CoStar Enterprise.

This position has the opportunity for hybrid work with up to two days remote per week. Four-day work weeks are also an option for those applicants that are interested.


Perform network security assessments to include threat modeling, pen testing, and configuration analysis
Audit existing design and infrastructure configurations and recommend changes to improve security posture
Evaluate firewall change requests – both on-premise and in the cloud
Design, enforce, and audit configurations and policies across the network to include firewalls, load balancers, routers, switches, DNS, Wi-Fi controllers, VPNs, and SD-WAN
Tune and sustain Intrusion Prevent Systems (IPS)
Participate in threat intelligence and detection engineer to improve anomalous or known malicious network related events
Follow, develop, and improve network and security configuration policies, standards, and procedures
Design and audit controls for large scale Kubernetes and AWS cloud networking environments
Work to disable insecure and outdated network protocols and cipher suites and create/enforce an enterprise wide standard for TLS


Bachelor’s Degree
5+ years total experience in engineering, including a minimum of 3 years in Security specific roles
Proficiency in scripting/programming (Terraform, Perl, Python, PowerShell)
Expert knowledge of subnetting and segregation of networks
Experience with AWS networking – including NACL’s, security groups, NLB’s/ALB’s, transit gateway, and AWS Network Firewall
Experience with network security tooling (NMAP, Snort, Aircrack, Nipper, etc)


Founded in 1987, CoStar Group is the leading provider of commercial real estate information, analytics, and online marketplaces. Our suite of online services enables clients to analyze, interpret and gain unmatched insight on commercial property values, market conditions and current availability. Behind some of the most well-known brands in the industry, CoStar Group includes CoStar, the largest provider of CRE research and real-time data; LoopNet, the most heavily trafficked mobile and online real estate marketplace; the premier rental home resource for renters, property managers and owners; STR, the leading provider of performance benchmarking and comparative analytics to the hotel industry; BizBuySell, the largest online marketplace for businesses-for-sales; and Lands of America, the leading operator of online marketplaces for rural real estate.

Headquartered in Washington, DC, CoStar Group maintains offices throughout the U.S. and in Europe, Canada, and Asia with a staff of over 4,300 worldwide.


Working at CoStar Group means you’ll enjoy a culture of collaboration and innovation that attracts the best and brightest across a broad range of disciplines. In addition to generous compensation and performance-based incentives, you’ll be supported in both 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
Commuter and parking benefits
401(K) retirement plan with matching contributions
Employee stock purchase plan
Paid time off
Paid parental leave (up to 12 weeks)
Tuition reimbursement
On-site fitness center and/or reimbursed fitness center membership costs (location dependent)
Complimentary gourmet coffee, tea, hot chocolate, prepared foods, fresh fruit, and other healthy snacks

Be part of a team of professionals enjoying the opportunity to learn, do, and grow in a rewarding atmosphere. But don’t just take our word for it – see why our team chose to work at and stay at CoStar Group:

Apply Here

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