Why Adding Developers to a Late Project Can Make It Even Later

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A common leadership response to delayed software projects is hiring more developers, but this approach often overlooks the real constraints slowing delivery. New engineers consume existing team capacity during onboarding, as experienced members must pause their own work to share knowledge and review unfamiliar code. Growing team size also multiplies coordination overhead, meaning more effort goes into aligning decisions and resolving dependencies rather than shipping features. Bottlenecks in code review, QA, or approvals can negate any gains in raw coding output, since delivery speed is limited by the slowest stage in the pipeline. Brooks's Law warns that adding people to a late project can delay it further, and its core lesson is to identify what is actually constraining delivery before reaching for headcount as a solution.

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