How would you answer an interview scenario involving signals and reactive state in Angular?

For an interview scenario involving signals and reactive state, I would first clarify the business goal, scale, constraints, and the failure or quality attribute the interviewer wants to explore. Angular signals are reactive values that track where they are read and notify dependent computed values or effects when they change. In this scenario, if a total price depends only on quantity and unit price signals, model it as computed rather than manually updating another signal whenever either input changes. For production, use signals for local synchronous state, computed for derived values, and effects primarily for synchronization with external systems. Keep state ownership explicit. 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.