CoStar Group, a leading provider of real estate information and analytics, is seeking a Lead Software Engineer to join their team in Arlington, VA. This role offers a hybrid work arrangement with on-site work Monday through Thursday and remote work on Fridays. As a Lead Software Engineer, you'll have direct impact on CoStar Suite web applications used by millions globally. The position requires 8+ years of experience in modern technologies and offers comprehensive benefits including healthcare, 401(k) matching, and professional development opportunities. You'll be responsible for designing high-performance applications, mentoring junior developers, and driving continuous improvement through engineering excellence. The role combines technical leadership with hands-on development, requiring expertise in React, TypeScript, Node.js, and cloud technologies. CoStar Group, included in both S&P 500 and NASDAQ 100, offers a collaborative culture focused on innovation and excellence in real estate technology.