When building an MVP, you want to steal as much code as possible. You're not worried about code licensing, you want to validate the market as quickly as possible with open source. So you want to use third party libraries to do the heavy lifting in your app. This is the heart of most great new companies, leveraging an emerging technology to serve a new market. Uber didn't build a GPS mapping system in its first version. Google didn't build an NLP system in its first version. Netflix didn't build a facial recognition library for identifying actors in its prototype. You shouldn't either. This article gives a few tips in identifying and using existing libraries for your MVP.