Design a Priority Work Queue · System Design Interview

Design a Priority Work QueueDesign the queue behind a shared build service, where a paying customer’s job should start before a free one, and no job should wait forever.What it has to do

A higher-priority job starts before a lower-priority one that is already waiting

A low-priority job eventually runs, however busy the queue is

No single customer can occupy the whole fleet

Scale

Jobs per day: 25 million

Customers: 300,000

Out of scope

Running the build itself

Pricing and plan definitions

The build cache

Practise this challengeAll system design challenges

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