D8LooP - Practise Data Engineering

Preparing your workspaceloading the brief, studio & canvas…

buyersellerlistingorder

SCENARIO

You have joined a SaaS company that bills customers on recurring plans. Billing runs on spreadsheets today; you are designing the first relational model for the recurring-billing system.

your ERD must answer

01Which customer is on which plan — and since when?
02What does each subscription owe for a billing period?
03Which invoices were paid, when, and how much?

out of scopeUsage metering · taxes · dunning · revenue recognition

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

68%

You built the model in the Studio. Now defend it.Subscriptions & billing

Design review

The reviewer reads your model.

Preparing your workspaceloading the brief, studio & canvas…

buyersellerlistingorder

SCENARIO

You have joined a SaaS company that bills customers on recurring plans. Billing runs on spreadsheets today; you are designing the first relational model for the recurring-billing system.

your ERD must answer

01Which customer is on which plan — and since when?
02What does each subscription owe for a billing period?
03Which invoices were paid, when, and how much?

out of scopeUsage metering · taxes · dunning · revenue recognition

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

68%

You built the model in the Studio. Now defend it.Subscriptions & billing

Design review