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Small team chatMediumDesignDesignMedium35 minNotification sender with retryMediumDesignDesignMedium35 minWebhook deliveryMediumDesignStripe styleDesignStripe styleMedium30 minHigh-volume webhook deliveryMediumDesignStripe styleDesignStripe styleMedium40 minSupport ticket routing and SLAMediumDesignServiceNow styleDesignServiceNow styleMedium40 minReal-time personalization shelfMediumDesignNetflix styleDesignNetflix styleMedium45 minJob queue with worker poolMediumDesignDesignMedium40 minConnection pool coordinatorMediumDesignDesignMedium35 minServer-sent event fan-outMediumDesignDesignMedium40 minPresence status serviceMediumDesignMeta styleDesignMeta styleMedium40 minEvent sourcing append-only storeMediumDesignDesignMedium40 minEvent-streaming ledger backboneHardDesignStripe styleDesignStripe styleHard45 minHierarchical IoT pub/sub brokerHardDesignAmazon styleDesignAmazon styleHard45 minHome-feed delivery at scaleHardDesignMeta styleDesignMeta styleHard45 minHigh-throughput pub/sub systemHardDesignDatabricks styleDesignDatabricks styleHard45 minOutbound webhook deliveryHardDesignStripe styleDesignStripe styleHard45 minReal-time streaming aggregationHardDesignDatabricks styleDesignDatabricks styleHard50 minCache invalidation via CDCHardDesignShopify styleDesignShopify styleHard45 minMulti-tenant order secondary indexesHardDesignAmazon styleDesignAmazon styleHard45 minMulti-region price invalidationHardDesignAmazon styleDesignAmazon styleHard45 minAPI gateway cascading failuresHardDesignNetflix styleDesignNetflix styleHard40 minMulti-tenant job schedulingHardDesignDesignHard45 minEdge key-value storeHardDesignDesignHard50 minExactly-once payment eventsHardDesignStripe styleDesignStripe styleHard50 minAutomated anomaly detectionHardDesignDesignHard45 minMulti-backend telemetry pipelineHardDesignDesignHard45 minLive counter vs settlement reportHardDesignStripe styleDesignStripe styleHard50 minIoT latest-state lakehouseHardDesignDatabricks styleDesignDatabricks styleHard50 minVideo session windowingHardDesignNetflix styleDesignNetflix styleHard45 minChannel access at scaleHardDesignSalesforce styleDesignSalesforce styleHard40 minVideo transcoding pipelineHardDesignGoogle styleDesignGoogle styleHard50 minLow-latency live streamingHardDesignAmazon styleDesignAmazon styleHard50 minVideo DRM and licensingHardDesignNetflix styleDesignNetflix styleHard45 minGlobal VOD content distributionHardDesignNetflix styleDesignNetflix styleHard50 minIoT telemetry ingestionHardDesignAmazon styleDesignAmazon styleHard50 minMarket data fan-outHardDesignBloomberg styleDesignBloomberg styleHard50 minMulti-device push notificationsHardDesignMeta styleDesignMeta styleHard45 minPresence system at scaleHardDesignSalesforce styleDesignSalesforce styleHard45 minWebhook delivery systemHardDesignStripe styleDesignStripe styleHard50 minLive auction biddingHardDesignShopify styleDesignShopify styleHard50 minDistributed tracing backendHardDesignUber styleDesignUber styleHard50 minExactly-once windowed aggregatesHardDesignStripe styleDesignStripe styleHard55 minMulti-region message brokerHardDesignDesignHard55 minAdaptive traffic shaping under overloadHardDesignStripe styleDesignStripe styleHard45 minDependency-tracked cache invalidationHardDesignMeta styleDesignMeta styleHard45 minExactly-once transaction ETLHardDesignDatabricks styleDesignDatabricks styleHard45 minReal-time mobile analyticsHardDesignDatabricks styleDesignDatabricks styleHard40 minLambda to kappa migrationHardDesignDatabricks styleDesignDatabricks styleHard45 minExactly-once billing aggregatesHardDesignDatabricks styleDesignDatabricks styleHard40 minCDC snapshot-to-stream handoffHardDesignDatabricks styleDesignDatabricks styleHard40 min