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Problems

Basics first, then the classics, then company-style assessments. Every problem has tests you run right here; multi-level ones unlock as you go. See the roadmap.

Practical systems

Streams & durability

Rate counters, serialization, retrying work queues.

16 problems

Practical systems

Streams & durability Rate counters, serialization, retrying work queues.

Rolling windows and rate counters

Fault-tolerant work queue

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