How would you answer an interview scenario involving reactive forms in Angular?

For an interview scenario involving reactive forms, I would first clarify the business goal, scale, constraints, and the failure or quality attribute the interviewer wants to explore. Reactive forms model form controls and validation explicitly in TypeScript using FormControl, FormGroup, FormArray, validators, and observable state changes. In this scenario, for an order form with a variable number of line items, model the rows with a FormArray and apply validation at both control and aggregate form levels where appropriate. For production, define validators centrally, use typed forms, derive UI state from form status, clean up custom subscriptions, and separate domain validation from purely presentational validation. I would then explain the main alternatives and tradeoffs, identify likely failure modes, and describe how I would validate the solution through testing, observability, security controls, and recovery or rollback planning.