Why consider micro frontends?

When multiple teams start stepping on each other's toes inside a single frontend — overlapping releases, long PR queues, shared state that keeps growing — the case for splitting the app starts to make itself. Micro frontends let each team own a slice end to end and deploy on their own cadence.

What actually makes it work

It isn't the tool. Module Federation is the easy part. The harder parts:

• Clear domain boundaries. If two teams keep reaching into each other's apps, the split doesn't buy anything.
• A shared shell with strong contracts. Auth, routing, and design system live here. Everything else is a detail.
• Consistent UX. Users shouldn't feel the seams.

What to watch out for

• Duplicate dependencies blow up bundle size unless you share at the shell level.
• Runtime errors in one remote can break the shell if you don't isolate them.
• Onboarding gets harder — new engineers have to learn the shell contract before they can ship.

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