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- Design a notification serviceDelivery guarantees when every downstream provider is someone else and fails.mediumWrittenExplain to unlock#hld#queues#reliability45 min
- Design a rate limiterSmall surface, deep follow-ups. The distributed counter race is the real question.mediumWrittenExplain to unlock#concurrency#hld#reliability45 min
- Design a retry policyRetries are the most common way a small outage becomes a large one.mediumWritten#distributed-systems#lld#reliability25 min
- What does idempotent actually mean?Everyone can list which verbs are idempotent. Far fewer can make a payment endpoint safe to retry.mediumWrittenExplain to unlock#api-design#reliability#rest20 min