Had over a million people use my code last year, when I checked for vanity. 12 years commercial experience. I'm effectively the tech lead for two startups, one

Had over a million people use my code last year, when I checked for vanity. 12 years commercial experience. I'm effectively the tech lead for two startups, one getting about 750k users per year, the other 250k. Freelancer, but I do a lot of time for 2 clients at the moment. Both were projects started by other people, but a significant chunk of the code is mine now (one of them I've virtually totally rewritten from VB.Net to C#) and the other I've done huge amounts of refactoring to fix big performance problems, reducing the "main" pages from 10 sec load times for complicated orders to 250ms. I've also refactored a lot of javascript for both of them without any tests, significantly improving client-side compile times and page load times. I played with unit tests a few years ago, one of my clients has some, but we mainly don't add any new ones and they never catch anything[1]. [1]That's a slight fib, one caught a bug last month for the first time in the 1.5 years I've worked for this client. It would almost certainly have been caught in testing though.