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High level design:

• thin API layer with Swagger for API testing
• application services
• encapsulated Domain logic

Some shortcuts to save time:

• no Infrastructure Layer: Hosting is merged with API and Repositories are in application layer
• no application models: domain models are leaked outside
• supports happy path scearios only, no model and buisness rules validations
• no configs, all values are hardcoded
• some other parts that I tried to annonate in the code
• no api annontations
• no tests