Doing a startup in your spare time is a good way to get fired. It is also a good way to ruin your good idea. Part time startups work only if you are trying to

Doing a startup in your spare time is a good way to get fired. It is also a good way to ruin your good idea. Part time startups work only if you are trying to start a "home business" that is very different from you day job. You work at Best Buy, and want to start a new search engine. Great. That is better than quitting you job to start a new search engine. You work at Google and want to start a social network. You are going to get fired. There is a good chance Google will own your code, and you won't have enough time to get your social network off the ground, so now you are doubly screwed. You work at Google and want to start a business selling Clay ovens on the weekend. Congrats you have a startup that won't break Google's moonlighting rules.