Our tech stack was largely Microsoft based. We had a classic ASP website and we ran on SQL Server. Everything kinda ran well, but what we lacked was any sort of contigency. We’d grown so quickly that no-one had had the time to think about disaster recovery or database backups or even source control.
Unit and integration testing didn’t exist, exception handling was minimal and problems were fixed as we found them - in production.
You can see where this is going.