Contract-First Development Helped One Team Avoid Costly Feature Rebuilds

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A software developer at a therapy-platform company shared how a seemingly simple feature request — letting therapists drill into chart objectives and targets — turned out to be a complex UX challenge. Before writing any code, the developer drafted a plain-language contract defining triggers, expected outputs, interactions, and explicit non-goals. This upfront contract immediately surfaced two unresolved product decisions about layout and scroll behavior that would otherwise have been resolved accidentally during implementation. The developer then built a static HTML prototype first, gathering cheap early feedback before touching the real component tree, state management, or test suite. The approach, aided by an AI pair used selectively per phase, prevented the team from building and then rebuilding the feature due to late-discovered UX issues.

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