Most over-engineered system you've ever worked on?

I'll start. A team built 14 microservices for a charter school admin platform. Enrollment, attendance, grading, scheduling, cafeteria and report cards. Each with its own database and deployment pipeline. An attendance query took 4 service hops and 3 seconds.

The replacement: one service, one database, well-structured modules. Built in an afternoon. Query time dropped to under 200ms.

14 services for a system that served 10 schools.

Yours?