Congratulations to them and to all Jetbrains employees. They managed to do two really hard things which most developers flirt with at some time or another.
1. Create a new editor/IDE that's actually better not just different. I think everyone has had shower thoughts about making a better IDE and many have tried and failed. Jetbrains succeeded.
2. Creating a useful abstraction. IntelliJ was a great Java IDE but what's truly impressive is how they've been able to repeat the formula for almost any language out there. Everything from Go to JavaScript has a great Jetbrains IDE. They seem to have somewhat solved the general problem, which is normally a folly but in this case the key to a multibillion dollar company.
1. Create a new editor/IDE that's actually better not just different. I think everyone has had shower thoughts about making a better IDE and many have tried and failed. Jetbrains succeeded.
2. Creating a useful abstraction. IntelliJ was a great Java IDE but what's truly impressive is how they've been able to repeat the formula for almost any language out there. Everything from Go to JavaScript has a great Jetbrains IDE. They seem to have somewhat solved the general problem, which is normally a folly but in this case the key to a multibillion dollar company.
So again, congratulations!