MERN gets you moving fast — until deploy day. The difference between a demo and a product is usually boring infrastructure done well.
Containerizing apps with Docker and deploying on AWS cut our deploy time dramatically and made environments predictable.
On the data side, MongoDB indexing and query discipline matter more than fancy ORMs. Measure slow paths early.
On the frontend, modular reusable components and clear state boundaries keep velocity high without turning the app into a rewrite candidate.
Ship small, observe, iterate. Production is the only teacher that never lies.