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by api 4331 days ago
This one comes to mind:

http://www.nastygal.com

https://www.youtube.com/watch?v=VAVq-sW6LCA

Not sure I'd call it a "tech" startup, but it definitely counts as a startup and a successful one. Apologies to #2 if I'm wrong about it being sole founder. I'd say it's more successful than some of the revenue-free entries on this list.