Services

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To visualize request flows, see the Service Diagram.

Service	Language	Description
accountingservice	.NET	Processes incoming orders and count the sum of all orders (mock/).
adservice	Java	Provides text ads based on given context words.
cartservice	.NET	Stores the items in the user’s shopping cart in Redis and retrieves it.
checkoutservice	Go	Retrieves user cart, prepares order and orchestrates the payment, shipping and the email notification.
currencyservice	C++	Converts one money amount to another currency. Uses real values fetched from European Central Bank. It’s the highest QPS service.
emailservice	Ruby	Sends users an order confirmation email (mock/).
frauddetectionservice	Kotlin	Analyzes incoming orders and detects fraud attempts (mock/).
frontend	TypeScript	Exposes an HTTP server to serve the website. Does not require sign up / login and generates session IDs for all users automatically.
loadgenerator	Python/Locust	Continuously sends requests imitating realistic user shopping flows to the frontend.
paymentservice	JavaScript	Charges the given credit card info (mock/) with the given amount and returns a transaction ID.
productcatalogservice	Go	Provides the list of products from a JSON file and ability to search products and get individual products.
quoteservice	PHP	Calculates the shipping costs, based on the number of items to be shipped.
recommendationservice	Python	Recommends other products based on what’s given in the cart.
shippingservice	Rust	Gives shipping cost estimates based on the shopping cart. Ships items to the given address (mock/).
react-native-app	TypeScript	React Native mobile application that provides a UI on top of the shopping services.