System Design AI

Guided practice

Start with a template. Work through each step. Ask Coach when you need a second opinion.

Designs with worked examples 1

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RemindersClear filters

34. Delay Queue Scheduler
Millions of future actions — reminders, retries, expiries — must fire near their due time. Scanning everything every minute does not scale, and an in-process timer dies with the process.
Infrastructure & SREMedium
Queues Reminders Scheduling
+1
Amazon SQS
Worked design
Practice

Self-paced by default. Your answers and canvas stay private. AI feedback runs only when you ask for it.