D8LooP - Practise Data Engineering

Preparing your workspaceloading the brief, studio & canvas…

buyersellerlistingorder

SCENARIO

You've joined Spark, a dating app. Two people who both swipe right can talk — and either can unmatch, which closes the chat and must stop them being shown to each other again. Every single swipe asks *“have these two matched?”*, and that has to come back in single-digit milliseconds.

your model must answer

01A user's current matches, most recent first?
02Whether two given users have matched — on every swipe, in single-digit milliseconds?
03Swipes, matches, and matches that produced a first message, per day?

out of scopePhotos · prompts · distance · paid boosts · moderation

This exercise’s brief could not be loaded.The guided questions and their model answers come from the review service. It looks like it is not reachable — start it with pnpm dev:api and reload.The canvas below still works, so you can model now and run the review once the service is up.

Build starts here

The brief becomes the left drawer. The canvas stays the build surface.Study is done above. Build the tables here, hit review to validate, then use follow-ups to defend the model.

Practice studio

Ctrl/Cmd + C copyCtrl/Cmd + V pasteCtrl/Cmd + Z undoDelete remove

Start with the data model, then layer system context

Use entities and relationships for the real ERD. Add notes, containers, or curated cloud shapes only when they sharpen the story you are architecting.

68%

You built the model in the Studio. Now defend it.Matches at scale

Design review

The reviewer reads your model.

Preparing your workspaceloading the brief, studio & canvas…

buyersellerlistingorder

SCENARIO

your model must answer

01A user's current matches, most recent first?
02Whether two given users have matched — on every swipe, in single-digit milliseconds?
03Swipes, matches, and matches that produced a first message, per day?

out of scopePhotos · prompts · distance · paid boosts · moderation

Build starts here

The brief becomes the left drawer. The canvas stays the build surface.Study is done above. Build the tables here, hit review to validate, then use follow-ups to defend the model.

Practice studio

Ctrl/Cmd + C copyCtrl/Cmd + V pasteCtrl/Cmd + Z undoDelete remove

Start with the data model, then layer system context

Use entities and relationships for the real ERD. Add notes, containers, or curated cloud shapes only when they sharpen the story you are architecting.

68%

You built the model in the Studio. Now defend it.Matches at scale

Design review