Use Monzo's historical public web-engineer portal task as a practice reference. Explain how you would handle token expiry, app updates, and paginated user lists without stale cross-app state.

Original preparation outline: model authentication and reauthentication explicitly, keep app identity in requests and caches, preserve unsaved edits appropriately, and define pagination and error states. Use a local fixture if the old dummy API is unavailable; label that substitution.