CoStar Group is seeking an accomplished Lead Software Engineer to join our Irvine, CA team, working onsite 4 days a week with 1 day remote. You will lead development across multiple web products, including LoopNet, and own high-visibility software touching millions of users.
The role emphasizes OO design, strong C#/.NET expertise, frontend work in Vue/React/Angular (TypeScript), and deep knowledge of AWS services. You will mentor teams and drive architectural excellence.
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