One thing to keep in mind with respect to that - often when teams grow you get more ivory tower types. Not that everyone wants to build an ivory tower, but you do get a lot of in-between. One thing to keep in mind about why the code was the way it was - it was designed that way to grow the company fast and to get customers. Nearly all companies that start that growth will face the inevitable - let's rebuild all of this from scratch. It doesn't mean your original contributions were worthless - no one would be working there if that was true.
In the end you may move more towards explaining to people how the company operates, how the data is processed and keep that going.
In the end you may move more towards explaining to people how the company operates, how the data is processed and keep that going.