Wow I'm just 5 mins into the video and this looks ridiculously powerful. This is essentially an integrated development environment for game development with eve

Wow I'm just 5 mins into the video and this looks ridiculously powerful. This is essentially an integrated development environment for game development with everything every programmer dreams about! How do I learn to make such tools? From what I heard everything in the video is built in-house including the language and compiler. Although I understand many game studios do similar stuffs this is by far the most impressive I heard about.