Why micro frontend contracts matter more than bundler config

A development team building a React-based government events platform adopted Module Federation to allow independent deployments across multiple teams, replacing a monolithic release process that forced everyone to wait on the slowest team. The core challenge they identified was not the bundler setup, which can be configured in hours, but defining and enforcing explicit contracts between the shell and remote modules. Each remote was required to declare its exposed props, emitted events, and shared dependency version ranges, with the shell refusing to mount any remote that fell outside the agreed range. This approach moved failures to load time rather than production, eliminated release-train coordination, and reduced the overall release cycle by roughly 40 percent. The team concluded that splitting frontends by team ownership, keeping shared dependencies minimal, and writing the contract before touching build config are the critical factors for sustainable micro frontend architecture.