Designs

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  45. Design a Job Scheduler

  Run 10,000 jobs a second within two seconds of their time, at least once, with retries, fairness between tenants and exactly-once effects.

  ClassicMedium

  QueuesDatabasesAWS

  +5

  CronDynamoDBIdempotencySchedulingAmazon SQS

  Worked design

  Practice
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  69. Design Long-Running Tasks: Async Jobs with Progress and Results

  Accept in milliseconds, work in the background: leases and heartbeats, retries and dead letters, progress by SSE and webhooks, fairness across tenants.

  ClassicMedium

  QueuesAsync jobsAWS

  +3

  IdempotencyMulti tenancyAmazon SQS

  Worked design

  Practice
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  80. Design a Message Queue like Amazon SQS

  Build a queue around visibility leases and explicit acknowledgement, then add replicated partitions, FIFO groups, tenant fairness and bounded redrive: three self-contained interview boards.

  ClassicMedium

  QueuesAt least onceAWS

  +2

  FIFO orderingAmazon SQS

  Worked design

  Practice

Each design brings together the brief, practice, examples and discussion.