Build a Magento extension

I need to build a Magento extension for Magento 2.0 (Yes, 2.0, not 1.0). The extension will validate customer's address in the checkout page using Goolge Place API. It is similar to this one [login to view URL] (but for version 2.0) It needs to work with both Guess customer and Logged In customer. This is a good opportunity for you to prepare for Magento 2.0