BE Engineer Interview - Hotel Booking System

You have been assigned the task of building a backend system for a booking engine that will be used by a hotel group. The system will be built using microservices to ensure scalability and ease of maintenance with a large team. Your task is to develop three services: Gateway, Identity, and Booking. Please follow the design system "diagram.png", "Requirements" to implement and submit "Delivery".

1. Below are some explains:

Gateway Service:

- Responsible for handling external requests and routing them to the appropriate services.
- Internal communication with the Identity and Booking services should use GraphQL or gRPC, while public communication can be done via RESTful APIs.

Identity Service:

- Handles user authentication, including login and registration.
- Generates random JWT (JSON Web Tokens) for user authentication.
- A User need contains: id, firstname, lastname, created_at

Booking Service:

- Manages hotel bookings, including creating and canceling bookings.
- A Bookings need contains: id, hotel(id, name), guest(id, lastname, firstname), checkin_time, booking_time, created_at

2. Requirements:

- Develop 3 services for system and public 4 APIs.
	1. register
	2. login
	3. create-booking (must security with JWT Token)
	4. delete-booking (must security with JWT Token)
- The system should have three isolated source code folders: gateway, identity, and booking. (Can structure like "structure.png")
- The Identity and Booking services should have separate databases (connection to your localhost database).
- Have at least two services should be implemented using Java Spring Boot. The third service can be implemented using any programming language of your choice.
- Can use any opensoruce library to support your development.
- Internal communication between the Gateway service, Identity service, and Booking service should use GraphQL or gRPC.
- Public communication can be use RESTful APIs or GraphQL.

3. Delivery:

- Git Repository links have 3 backend servies: gateway, identity, booking
- Postman collection export contains: 4 APIs

4. Very nice to have:

- Docker compose setup to easy start all services and database
- All internal service communication use gRPC
- 1 services implement with Golang or Python
- Readme document instructs how to run start your services