I'm a bit in the same situation, altough after only seven months. I had a case of buyer's remorse after a few months, after being very excited at the beginning

I'm a bit in the same situation, altough after only seven months. I had a case of buyer's remorse after a few months, after being very excited at the beginning (company logo as background and all). I soon realized the only new thing I learned is not to put on lightly-colored tshirts under dark pulls. And some PHP, which I tend to consider a negative asset. I'm now looking into PhD too, for the same reasons. And being in Europe, I think the lifestyle change (young software engineer -> PhD student) won't even be that big.