Agree on contracts early
Define data shapes, validation, error responses and loading behavior before the UI is deeply coupled to backend assumptions.
A strong frontend does not fight the platform behind it. It understands the CMS, backend contracts, rendering model and operational constraints, then creates a clean interface layer around them.

When data contracts, UI state and platform responsibilities are clear, design changes remain safe and backend changes stop leaking unpredictably into the interface.
Define data shapes, validation, error responses and loading behavior before the UI is deeply coupled to backend assumptions.
Use native platform patterns when they are robust; customize where user experience genuinely needs it.
CMS-driven interfaces should tolerate missing images, long titles, optional fields and non-technical content editors.
Keep presentational components, data access and platform-specific hooks isolated enough to change independently.
APIs fail, sessions expire and data arrives late. The interface should make those conditions understandable.
Ship the smallest vertical slice end-to-end first, prove the contract, then scale the pattern.
Understand routing, templates, CMS models, APIs, caching and deployment constraints.
List exactly what the frontend needs and what each state means.
Connect one real component to real data and validate the full path.
Abstract only after repeated behavior is proven.
Test forms, auth, APIs, CMS content and edge states before release.