Ex-Facebook Engineering Lead: Splitting Teams by Tool Was a Huge Mistake

cnakazawa · x · 2026-07-24

A former Facebook JavaScript infrastructure lead reflects on an early management mistake: splitting the team into three distinct groups based on specific tools (the Yarn package manager, the Jest testing framework, and the Metro bundler).

While this approach effectively improved each tool individually in the short term, it ultimately hindered long-term overall team efficiency and collaboration.

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