Worked for 5 years old a ColdFusion codebase that is still in use for a large SaaS. 1 Big monolith, no tests, all procedural code and changing any code would break something somewhere else.

But honestly now I work on a typescript monolith thats moving to microservices and its probably worse than the ColdFusion code base. I'd rather work on the ColdFusion codebase.