Well, for Google it's not that ideal. Google claims 100% of the IP done inside and outside of your work. "As part of your employment agreement, Google most lik

Well, for Google it's not that ideal. Google claims 100% of the IP done inside and outside of your work. "As part of your employment agreement, Google most likely owns intellectual property (IP) you create while at the company. Because Google’s business interests are so wide and varied, this likely applies to any personal project you have. That includes new development on personal projects you created prior to employment at Google. However, we understand and sympathize with the desire to explore and ship technology projects outside of Google."