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Ask HN: How does one design a system to deliver scheduled notifications?

1 points by adnauseum ↗ HN
Every week at work I get a bunch of reminders which I schedule in apps like Slack, Google Calendar, etc. These notifications arrive always within the minute that I scheduled and it always impresses me! Delightful!

I want to learn about how a this type of system is designed. I've searched a lot, but haven't yielded anything about systems that handle scheduled notifications.

Some wonderings: - What is the name given to these types of systems (if any)? - How does one design a system like this? - Are there any open source projects I can learn from?

2 comments

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PaulHoule
As an applications programmer in a hurry I would do this by using something like

https://aws.amazon.com/sqs/

A desktop application could connect to SQS directly, a web application would need to have a websocket server that catches notifications.