Low level desing system

Review APP Low level design system

Content index

• Definitions and requirements of business
• Requirements of the system
• Architecture of the system
• Modeling of data
• Testing
• CI/CD Integration

Requirements of the system

Just design the system of backend, not the frontend

Review reader

• Just get content of reviews GET
• Thousand of users(1000+ readers) can see the reviews
• They must be able to see the reviews around the world
• Response time must be less than 10 seconds
• In case, the reviews is more than 100 reviews, the response should be paginated
• What's going on if the server is down? (Cache, CDN, etc)

Review publisher

• Create, edit and remove reviews of cameras (POST, PUT, DELETE)
• 10 Users can create reviews
• Service must be available 24/7
• Review publisher must be able to authenticate (Login and Logout, JWT, Register)
• Review publisher must be able to upload images
• Response time must be less than 300 seconds
• 10 and 20 reviews per day (No needs a lot of resources)
• Publishers just can create reviews in America Sur

Architecture of the system

Load Balancer

• Nginx or HAProxy
• Local: Nginx with Docker
• Production: Azure Load Balancer

Horizontal Container

• Local: Docker
• Production: Azure Container App

ReviewReader:

• Tecnologies: FastAPI, Pydantic, Python 3.11 and aioredis
• Local: Python with Docker
• Production: Azure container App
• Cache
  • Local: Redis with Docker
  • Production: Azure Cache for redis
• Database
  • Local: MongoDB NoSQL with Docker
  • Production: MongoDB NoSQL

ReviewPublisher:

• Technologies: Django Rest Framework, Django and Python 3.10, Django redis
• Local: Python with Docker
• Production: Azure app service
• Cache
  • Local: Redis with Docker
    • Production: Azure Cache for redis
• Database:
  • Local: MySQL with Docker
  • Production: Azure MySQL Database

Authentication:

• Technologies: Django Rest Framework, Django and Python 3.10, Django redis and JWT authentication
• Local: Python with Docker
• Production: Azure functions
• Cache
  • Local: Redis with Docker
    • Production: Azure Cache for redis
• Database:
  • Local: MySQL with Docker
  • Production: Azure MySQL Database

Service of migration:

• Technologies: PHP 8.2, Mongo PHP Library, MySQL PHP Library and Composer
• Local: PHP with Docker
• Production: Azure functions

Modeling of data

Testing

CI/CD Integration