Managing 270+ individual client portals containing custom financial math models can easily lead to maintenance lock. Every time tax rates or mathematical equations adjusted, code updates had to be pushed to hundreds of different repositories.
To break this bottleneck, we restructured our MERN workflow. Instead of duplicating math formulas inside frontend states, we engineered a Central Calculator Engine.
The engine houses logic models declaratively in MongoDB, exposing RESTful endpoints. The frontend Next.js apps query these endpoints dynamically on execution.
Reusing a single deployable backend logic core meant any change in formulas is immediately updated site-wide, and client compile durations dropped dramatically.