Healthcare.gov is all opensource: https://www.healthcare.gov/developers/ https://www.healthcare.gov/developers/ Some chunks are made in node.js: https://github

Healthcare.gov is all opensource: https://www.healthcare.gov/developers/ https://www.healthcare.gov/developers/ Some chunks are made in node.js: https://github.com/STRML/Healthcare.gov-Marketplace https://github.com/STRML/Healthcare.gov-Marketplace They've taken down the source on github, though it used to be all there. The server they're running it on is AkamaiGHost, and likely linux (although I've heard they're running some on it on windows) It's an odd choice of technologies. For scalability I would have chosen something that scales across the cloud easy. I'd put my money on the different calls between organisations being at fault. There seems to be many API calls going on. It would take only one server to be slow to cause a cascading affect.