Able to locate the exact step and user group affected. Separate UX friction from technical failures, unclear value or a differentuser need. Combine funnel data, firsthand product checks, user conversations and support evidence. State what is knownand what is still a hypothesis.
Knowledge of PHP 7.4 compatibility, including avoiding unsupported syntax such as union types, match expressions, the nullsafe operator (?->), named arguments, enums, and constructor property promotion.