Software Engineer Challenge @ Fastwork

You are going to implement a notification service that will send notifications to users through different channels.

For example, on an e-commerce platform, when a buyer purchases a product, the notification service should send both email and push notifications to the seller.

Target events

Event	Noti channels	Noti target
Buyer sends chat message to seller	Email, Push	Seller
Buyer purchases product	Email, Push	Seller
Remind to pay for pending order	Push	Buyer
Purchased items are shipped	Push	Buyer

Requirements

• The service should be able to handle huge traffic spikes, e.g., sale events on double day 11.11.
• Notification channels should be configurable, e.g., the system should be able to send notifications via email, push, or both.
• Notification channel providers should be configurable and able to automatically switch over when one is down.
  • For example, if we have providers A and B for email, the system should automatically switch to B when A is down.
• Feel free to add any additional features you think might be necessary.
• The team should be able to monitor and verify if notifications are sent successfully.
• The final outcome, if not runnable, should at least include unit tests that cover most scenarios.

Technologies Stack

Programming Language

• Golang

Framework

• Your choice

Database

• PostgreSQL, MySQL

Example Project structure

notification-service-go/
├── cmd/
│   └── main.go
├── config/
│   └── config.yaml
├── internal/
│   ├── handlers/
│   │   └── notification.go
│   ├── models/
│   │   └── notification.go
│   ├── services/
│   │   ├── email_service.go
│   │   ├── push_service.go
│   │   └── notification_service.go
├── tests/
│   └── notification_test.go
├── config.yaml
├── docker-compose.yaml
├── go.mod
└── go.sum