Building a web app begins by outlining user roles, main use cases, and the data schema. A strong MVP emphasizes essential paths, intuitive navigation, and consistent UI elements, enabling swift delivery without becoming a brittle collection of isolated screens.

Post-launch, scalability and reliability take precedence: performance budgets, caching, secure login, and clean API agreements. With proper observability, CI/CD, and well-planned architecture, teams can iterate more rapidly while preserving code stability as features and traffic expand.