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. Our team is responsible for the development of CoStar’s recommendation systems, personalization features, and user behavior analytics across our consumer marketplaces, including Homes.com, Apartments.com, and LoopNet. These systems help users discover relevant properties, understand market trends, and engage more deeply with our products. We are searching for an experienced Senior Data Engineer to design and deliver scalable data systems that drive personalized experiences and user analytics across our marketplaces. In this role, you’ll partner with our Machine Learning team, building the data foundations that power recommendation engines, personalization models, and future AI-driven innovations across our high-traffic consumer marketplaces. This is a unique opportunity to work at the intersection of large-scale data engineering and applied machine learning, shaping the systems behind personalized experiences for millions of users. This position is located in San Diego (UTC Area) and is in office Monday through Thursday with work from home on Friday.