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Network Engineer- Arlington, VA

Job Description

Overview

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 seeking a motivated and detail-oriented Network Engineer I to join our Data Center Networking team. This is an early-career role ideal for candidates with 3–5 years of total IT experience, including 1–2 years of hands-on networking experience. You’ll work alongside a team of experienced engineers to support and maintain our global data center infrastructure, which powers high-traffic platforms like Homes.com, Apartments.com and LoopNet.com. This role is a great opportunity for someone looking to deepen their skills in a complex, enterprise-scale environment while contributing to the security, performance, and reliability of our data center networks.

This position is located at our **Arlington, VA** office and offers a schedule of Monday to Thursday in office and Fridays remote.

Responsibilities

+ Assist in the installation, monitoring, and support of enterprise data center network infrastructure, including core and distribution switches, firewalls, and load balancers, ensuring high availability and resilience across environments.

+ Configure, maintain, and troubleshoot Palo Alto firewalls to support network security operations. This includes creating and optimizing security policies, managing User-ID and App-ID features, configuring site-to-site and remote-access VPNs, enabling advanced threat prevention (IPS/IDS, WildFire, URL filtering), and monitoring traffic/logs to proactively detect and remediate security incidents.

+ Configure, maintain, and troubleshoot F5 LTM/GTM appliances to ensure high availability and optimized application delivery. This includes local and global load balancing, SSL offloading, health monitoring, iRules for traffic shaping, DNS/GTM for global traffic distribution, and integration with data center and cloud services to improve scalability and resiliency.

+ Support certificate management by assisting in the installation, renewal, and validation of digital certificates to secure applications and network services.

+ Contribute to AWS networking environments, including the configuration and support of VPCs, Transit Gateways, VPNs, Firewalls and Direct Connect links to extend and integrate hybrid infrastructure.

+ Participate in network automation initiatives using Python, Ansible, and Terraform, building repeatable processes to reduce manual tasks, improve deployment speed, and enforce configuration consistency.

+ Perform DNS and domain management tasks, including zone updates, record maintenance, domain migrations, and troubleshooting for internal and external services.

+ Develop and maintain network documentation, including diagrams, runbooks, and operational procedures, to support knowledge sharing and audit requirements.

+ Collaborate with cross-functional teams including Security, Database, Service Desk, and DevOps to deliver stable, secure, and high-performing network services that meet business needs.

Basic Qualifications

+ Bachelor’s Degree required from an accredited, not for profit university or college (preferably in Computer Science or related field)

+ A track record of commitment to prior employers

+ 3+ years of total IT experience, including 1+ years of hands-on experience supporting network infrastructure.

+ Strong understanding of routing and switching protocols, including but not limited to BGP, OSPF, EIGRP, and/or redundancy protocols such as HSRP and VRRP.

+ Experience with firewalls, including policy creation, VPN configuration, and/or security monitoring.

+ Experience with load balancing such as F5 LTM/GTM, including local and global traffic management, SSL offloading, and health monitoring.

+ Exposure to AWS networking concepts, including VPC design, VPNs, Transit Gateways, AWSNF and Direct Connect.

+ Knowledge of DNS and domain management, including record types, zone maintenance, and troubleshooting.

+ Strong troubleshooting, documentation, and communication skills, with the ability to clearly explain technical issues to both technical and non-technical audiences.

+ Demonstrated ability to learn quickly and work effectively in a fast-paced, collaborative environment.

Preferred Qualifications And Skills

+ Scripting/automation skills in Python, with working knowledge of configuration management tools such as Ansible or Terraform.

+ One or more relevant certifications (e.g., CCNA, CompTIA Network+, Aruba ACMA, or equivalent).

+ Experience supporting enterprise Wi-Fi and LAN/WAN environments.

+ Exposure to network monitoring tools (e.g., LogicMonitor, PRTG, SolarWinds).

+ Familiarity with firewall, load balancing, or cloud networking concepts (AWS, Azure).

+ Experience working in environments with ticketing systems and change management processes.

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, and tuition reimbursement.

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)

+ 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.

\#LI-MC5

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

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 37 years, giving us the perspective to create truly unique and valuable products and services. We’ve continually refined, transformed and perfected our approach to our business, creating a language that has become standard in our industry and for our customers. 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.

CoStar is committed to creating a diverse environment and is proud to be an equal opportunity workplace and affirmative action employer. All qualified applicants will receive consideration for employment without regard to race, color, religion, gender, gender identity or expression, sexual orientation, national origin, genetics, disability, age, or veteran status. CoStar is also committed to compliance with all fair employment practices regarding citizenship and immigration status.

If you are a qualified individual with a disability or a disabled veteran, you may request a reasonable accommodation if you are unable or limited in your ability to use or access www.costargroup.com/careers as a result of your disability. You can request reasonable accommodations by calling 1-855-840-1715 or by sending an email to [email protected] .