Micro-Frontends at Enterprise Scale — Lessons from the Trenches

Micro-frontends promise independent deployability and team autonomy — but the path from monolith to distributed frontend is rarely straightforward. After leading two such migrations at Fortune 500 organisations, here are the patterns that held up and the ones that quietly fell apart.

The Composition Problem

The hardest part is not splitting the application — it is deciding where the seams go. Domain boundaries that look clean on a whiteboard often become painful integration points when two teams need to share state or navigation context. Start by mapping user journeys, not org chart boundaries.

Module Federation vs iframes

Webpack Module Federation gives you runtime code sharing with a low integration overhead. iframes are simpler and provide true isolation but create significant UX friction — scroll position, focus management, and cross-frame accessibility all become your responsibility. For customer-facing surfaces, Module Federation is almost always the right choice.

Shared Design System as the Glue

A versioned design system component library is what keeps micro-frontends from fragmenting the user experience. Invest heavily in the system before the migration, not after.