Comment by enos_feedler

We had a startup called Runnable in 2013 that did a similar thing as repl.it. Coding sandboxes in many languages by spinning up docker containers on the backend [1]. We solved a lot of scaling problems, but I honestly thought the innovation was mostly handled by docker. And that was by 2013.

[1] http://web.archive.org/web/20140702013410/http://runnable.co...