I once worked at a startup where I was employee #1 doing full-stack. The CTO who hired me and 5 other developers wanted 100% test coverage from the start, and none of the details about his demands were discussed ahead of time. The rest of the tech workflow was so mired in bureaucracy and process that it was like swimming through mud. It was a disaster, we couldn't ship anything fast enough or at all, then the company pivoted, and then finally failed after about 8 months.