Starting with defining user roles, key scenarios, and the data model is essential in web app development. A solid MVP concentrates on core flows, intuitive navigation, and consistent UI components, allowing the product to ship rapidly without becoming a brittle collection of ad hoc screens.

Post-launch, scalability and reliability take center stage: performance budgets, caching, robust authentication, and clean API contracts. With effective monitoring, continuous integration/continuous deployment, and thoughtful architecture, teams can iterate more quickly while keeping the codebase stable as features and traffic expand.