In the pre-AI days I worked on a system like this that was constructed by a high-profile consulting team but continuously lost data and failed to meet even the basic standards.

I think I've seen so much rush-shipped slop (before and after) that I'm really anxiously waiting for this bubble to pop.

I have yet to be convinced that AI tooling can provide more than 20% or so speedup for an expert developer working in a modern stack/language.