Reminds me last summer when I was working as a junior software developer in this rather small or medium sized IT company. We used our custom framework written i

Reminds me last summer when I was working as a junior software developer in this rather small or medium sized IT company. We used our custom framework written in PHP, and the funny part was that the framework didn't have a single test. Everything had always done by testing manually and hoping for the best. Had I known this beforehand, I would have applied somewhere else. Anyway, our customer was (and still is) one of the biggest wholesale in some part of the Europe. We had developed online store for them like ten years ago, and the project had become more or less a legacy project where everything was outdated and nothing ever worked. If the customer asked some changes or updates, they were always implemented without proper refactorization nor testing. So you can imagine, if everything is done like this for the past decade with this custom framework, the code base just becomes too complex to maintain, not to mention developing it any further. So, I had worked in the company for about 3 months when I am given this project. The former developer had left huge changes unfinished without too much commenting nor even briefing me about them. Took me like 3 months to get myself familiarized with the project, finish up the changes and carry out the rest of the requests. The summer ended and everything seemed to work fine in the local as well as in the staging environment. It was Thursday morning I pushed the changes live and everything crashed. Quick rollback, some research, couple fixes and a new try. Same thing. New rollback, some research, some fixes and push. Still broken. Took me about 10 hours with the help of 2 developers to find out what was wrong. The framework was fundamentally broken in one part, it somehow didn't include files correctly. Still to this date, we don't know why it worked both in local and staging environments but not in production. When I got this fixed, new problems arose: customers had lost products from their carts, logins didn't work, the site was slow... After banging two weeks my head to the wall, everything finally worked. I was so relieved. These problems affected thousands of users throughout Europe, and I can imagine how pissed some customers might have been. I was so ashamed on behalf of our company, our "framework" and how things were done that I quickly left my resignation. If I learnt something, discuss the tools and how things are done in the company before applying for the job.