We rewrote the whole thing, except for iFraming some old pages in. We had to, the system was fucking awful and couldn't cope with any of the new mission critical requirements.

Client didn't understand the scope. Our project leader somehow snuck it in and we worked on it for months. We were sure we'd be kicked off the whole project... Somehow things didn't crash and burn. How it didn't blow up defies rational thought and the laws of physics. The new system worked, the client was happy, and boss made a lot of money.

Lead dev worked weekends for what feels like an eternity, it really was his baby and no one else on our company could have done it. It's where I finally learned how to do things the proper way; DDD, unit testing and TDD, architecture, building strong components in front-end, you name it. Before that I had a great nose for code smells and how not to do stuff, but now I got to see a proper system for the first time. It was glorious.

Then lead dev left and the system degraded quite a bit because new team didn't keep to the architectural patterns or general best practices. But we had a good run.