Dark (https://darklang.com https://darklang.com) was a bit of both. I spent several years thinking about the problem, and once I had a solution and decided to w

Dark (https://darklang.com https://darklang.com) was a bit of both. I spent several years thinking about the problem, and once I had a solution and decided to work on it, went into rapid prototyping to figure out if it could work. To a certain extent, we're still in that phase, just with a much bigger team now.