## Round 1 - OOD ## Problem Design the object model for a robot-staffed restaurant. The system must handle: table management, order taking by robots, kitchen preparation with cook stations, order delivery by a different set of robots, and billing. Different robot types have different capabilities. **Core entities to model:** - `Table`, `Order`, `MenuItem`, `KitchenStation` - `Robot` (base), `WaiterRobot`, `RunnerRobot`, `KitchenRobot` - `RestaurantController` (orchestrator) ```python class Robot: def __init__(self, robot_id: str, capabilities: list[str]): ... def assign_task(self, task: 'Task') -> bool: ... def status(self) -> str: ... class Order: def __init__(self, table: 'Table'): ... def add_item(self, item: 'MenuItem', qty: int): ... def total(self) -> float: ... def state(self) -> str: # PLACED, PREPARING, READY, DELIVERED ``` ## Follow-ups 1. How do you assign tasks to robots — what scheduling algorithm do you use (round-robin, nearest-robot, load-based)? 2. If a WaiterRobot breaks mid-order, how does the system reassign responsibility? 3. How do you model the kitchen pipeline — is it a queue per station or a global queue? 4. What design pattern handles state transitions for an Order (State, Strategy, or explicit FSM)?

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Robot Restaurant: OOD Design for an Autonomous Robot-Staffed Restaurant System

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Round 1 - OOD Problem Design the object model for a robot-staffed restaurant. The system must handle: table management, order taking by robots, kitchen preparation with cook stations, order delivery by a different set of robots, and billing. Different robot types have different capabilities. Core entities to model: Table, Order, MenuItem, KitchenStation Robot (base), WaiterRobot, RunnerRobot, KitchenRobot RestaurantController (orchestrator) Follow-ups How do you assign tasks to robots — what sch…

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This is a candidate experience report from a draftkings interview during the onsite round.

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Robot Restaurant: OOD Design for an Autonomous Robot-Staffed Restaurant System

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