Senior Software Engineer- CoStar Suite- Arlington, VA

Senior Software Engineer- CoStar Suite 

Arlington, VA 

Company 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, 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.    

About CoStar Suite 

CoStar Suite is the global leader in commercial real estate information, analytics and news. Commercial Real Estate industry professionals around the globe use CoStar Suite to access the most comprehensive data to make decisions with confidence. CoStar Suite delivers immediate, verified commercial real estate information on over 5.9 million properties across every market. Learn more about CoStar.  

About the Role  

As CoStar’s next Senior Software Engineer, you will contribute to the build of a greenfield, enterprise-scale web application infused with AI, leveraging modern technologies and frontier models. Drive the development of AI-powered product experiences while shaping AI-first engineering workflows that redefine how software is built. This is a high-impact role to architect, innovate, and influence the future of intelligent applications at scale. 

This position is located in Arlington, VA and is in onsite Monday – Thursday, with the option to work from home on Friday.  

Responsibilities 

• Architect scalable, resilient distributed systems — defining service boundaries, data contracts, and cross-team API standards for an enterprise-scale platform  

• Build responsive, high-performance applications using React, Node.js, Tailwind, etc. 

• Work with cloud-native services (Azure/AWS/GCP), containers, and microservices  

• Optimize for performance, observability, and developer productivity 

• Leverage AI Tooling & Automation (CI/CD, code generation, test generation)