CoStar Group, a NASDAQ-listed leader in real estate information and analytics, is seeking a Senior Software Engineer (.NET) to join their Platform team. This role offers an exciting opportunity to work on backend services powering major brands like Apartments.com, Homes.com, and CoStar. The position involves building distributed systems that serve thousands of users, utilizing C#, .NET Framework, and AWS technologies. Based in Arlington, VA, this hybrid role offers a 4-days onsite, 1-day remote schedule. The ideal candidate will have 5+ years of .NET development experience and strong database skills. The company offers comprehensive benefits including healthcare, 401(k) matching, stock purchase plans, and various wellness perks. As part of the S&P 500 and NASDAQ 100, CoStar Group provides a stable yet innovative environment focused on digitizing the world's real estate sector. This role presents an excellent opportunity for experienced developers looking to make a significant impact in the real estate technology space.