Low Level Design (LLD) Coding

Low Level Design (LLD) Coding

Design (LLD) a Hotel Management System - Machine Coding Interview

Design (LLD) a Hotel Management System - Machine Coding Interview's photo
·May 13, 2022·

4 min read

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Table of contents

  • Hotel Management System
  • Features
  • Rough Solution (LLD-Machine Coding)


Hotel Management System

A Hotel Management System is a software built to handle all online hotel activities easily and safely. This System will give the hotel management power and flexibility to manage the entire system from a single online portal. The system allows the manager to keep track of all the available rooms in the system as well as to book rooms and generate bills.


We’ll focus on the following set of requirements while designing the Hotel Management System:

  1. The system should support the booking of different room types like standard, deluxe, family suite, etc.

  2. Guests should be able to search the room inventory and book any available room.

  3. The system should be able to retrieve information, such as who booked a particular room, or what rooms were booked by a specific customer.

  4. The system should allow customers to cancel their booking - and provide them with a full refund if the cancelation occurs before 24 hours of the check-in date.

  5. The system should be able to send notifications whenever the booking is nearing the check-in or check-out date.

  6. The system should maintain a room housekeeping log to keep track of all housekeeping tasks.

  7. Any customer should be able to add room services and food items.

  8. Customers can ask for different amenities.

  9. The customers should be able to pay their bills through credit card, check or cash.

Rough Solution (LLD-Machine Coding)

Basic Entity

  • Guest: All guests can search the available rooms, as well as make a booking.
  • Receptionist: Mainly responsible for adding and modifying rooms, creating room - bookings, check-in, and check-out customers.
  • System: Mainly responsible for sending notifications for room booking, cancellation, etc.
  • Manager: Mainly responsible for adding new workers.
  • Housekeeper: To add/modify housekeeping record of rooms.
  • Server: To add/modify room service record of rooms.

Final Code

public enum RoomStyle {

public enum RoomStatus {

public enum BookingStatus {

public enum AccountStatus {

public enum AccountType {

public enum PaymentStatus {

public class Address {
  private String streetAddress;
  private String city;
  private String state;
  private String zipCode;
  private String country;
// For simplicity, we are not defining getter and setter functions. The reader can
// assume that all class attributes are private and accessed through their respective
// public getter method and modified only through their public setter method.

public class Account {
  private String id;
  private String password;
  private AccountStatus status;

  public boolean resetPassword();

public abstract class Person {
  private String name;
  private Address address;
  private String email;
  private String phone;

  private Account account;

public class Guest extends Person {
  private int totalRoomsCheckedIn;

  public List<RoomBooking> getBookings();

public class Receptionist extends Person {
  public List<Member> searchMember(String name);
  public boolean createBooking();

public class Server extends Person {
  public boolean addRoomCharge(Room room, RoomCharge roomCharge);
public class HotelLocation {
  private String name;
  private Address location;

  public Address getRooms();

public class Hotel {
  private String name;
  private List<HotelLocation> locations;

  public boolean addLocation(HotelLocation location);
public interface Search {
  public static List<Room> search(RoomStyle style, Date startDate, int duration);

public class Room implements Search {
  private String roomNumber;
  private RoomStyle style;
  private RoomStatus status;
  private double bookingPrice;
  private boolean isSmoking;

  private List<RoomKey> keys;
  private List<RoomHouseKeeping> houseKeepingLog;

  public boolean isRoomAvailable();
  public boolean checkIn();
  public boolean checkOut();

  public static List<Room> search(RoomStyle style, Date startDate, int duration) {
    // return all rooms with the given style and availability

public class RoomKey {
  private String keyId;
  private String barcode;
  private Date issuedAt;
  private boolean active;
  private boolean isMaster;

  public boolean assignRoom(Room room);
  public boolean isActive();

public class RoomHouseKeeping
  private String description;
  private Date startDatetime;
  private int duration;
  private HouseKeeper houseKeeper;

  public boolean addHouseKeeping(Room room);
public class RoomBooking {
  private String reservationNumber;
  private Date startDate;
  private int durationInDays;
  private BookingStatus status;
  private Date checkin;
  private Date checkout;

  private int guestID;
  private Room room;
  private Invoice invoice;
  private List<Notification> notifications;

  public static RoomBooking fectchDetails(String reservationNumber);

public abstract class RoomCharge {
  public Date issueAt;
  public boolean addInvoiceItem(Invoice invoice);

public class Amenity extends RoomCharge {
  public String name;
  public String description;

public class RoomService extends RoomCharge {
  public boolean isChargeable;
  public Date requestTime;

public class KitchenService extends RoomCharge {
  public String description;

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