- demo complexities of a trading app - tickers, pricing, holdings, available funds (per currency), forex - good state design - 'form state' to store dirty/error states per field to prevent rules failing on FTU - ui form validation through state selectors - support for amend through separation of 'editing' order and validated order 'onOrderEdited' - reducer for all state change actions with comprehensive unit tests - validation "middleware" to verify state changes per action - automated load of unit tests via params maintained in Google Sheet (+ Storybook)
