Overall I would have to say no. Much of the code (or more specifically the design/architecture of that code) that I wrote X years ago is horrible. At least I feel good in the sense that I have made a measured improvement in that department so it is not really what I dislike.

The problem is with doing corporate programming where you end up working on projects which you basically know are bad ideas from day 1. The amount of code I have written which has ended up being unused or underused is staggering.

Plus whenever policy on something changes I end up having to rewrite a bunch of stuff just to accommodate some sort of arbitrary change which I will then end up changing back some months down the line.

There is also the issue of having to work with other developers who don't really understand things like thread safety or O(n) vs O(n^2) or even how to use basic features in a DBMS.