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Consistency and moneyLevel 3Open topic
Resumable chunked uploadMediumDesignGoogle styleDesignGoogle styleMedium40 minS3-compatible object storageMediumDesignAmazon styleDesignAmazon styleMedium40 minCache invalidation at scaleMediumDesignMeta styleDesignMeta styleMedium45 minEdge feature-flag evaluationMediumDesignDesignMedium35 minRequest coalescing and batchingMediumDesignDesignMedium35 minExactly-once ledger posting consumerMediumDesignStripe styleDesignStripe styleMedium35 minRefund engine with lifecycle awarenessMediumDesignStripe styleDesignStripe styleMedium40 minImmutable ledger correctionsMediumDesignStripe styleDesignStripe styleMedium40 minStored-value wallet with promo expiryMediumDesignPayPal styleDesignPayPal styleMedium35 minAuthorize-then-capture with expiryMediumDesignStripe styleDesignStripe styleMedium40 minTransactional outbox patternMediumDesignDesignMedium35 minStream-batch reconciliationMediumDesignStripe styleDesignStripe styleMedium35 min
Session consistency across replicasMediumDesignMeta styleDesignMeta styleMedium40 minWorkflow instance locking and recoveryMediumDesignStripe styleDesignStripe styleMedium40 minLibrary checkout and holdsMediumDesignDesignMedium35 minCoupon redemption serviceMediumDesignDesignMedium35 minEvent ticket check-inMediumDesignDesignMedium35 minInventory trackerMediumDesignDesignMedium30 minMulti-tenant feature flagsMediumDesignDesignMedium40 minCoupon promotion engineMediumDesignShopify styleDesignShopify styleMedium40 minVersioned document storeMediumDesignAmazon styleDesignAmazon styleMedium35 min
ML systemsLevel 4Open topic
Grocery typeahead with inventoryMediumDesignWalmart styleDesignWalmart styleMedium40 minPeople you may knowMediumDesignMicrosoft styleDesignMicrosoft styleMedium45 minContinuous ETA model retraining pipelineMediumDesignDoorDash styleDesignDoorDash styleMedium40 minSelf-driving data labelingMediumDesignTesla styleDesignTesla styleMedium40 minNearby searchMediumDesignGoogle styleDesignGoogle styleMedium40 minLocation-biased place autocompleteMediumDesignGoogle styleDesignGoogle styleMedium35 minReal-time global leaderboardMediumDesignDesignMedium40 minReal-time engagement featuresMediumDesignAmazon styleDesignAmazon styleMedium40 minNear-duplicate media detectionMediumDesignGoogle styleDesignGoogle styleMedium40 minShadow deployment for fraud modelsMediumDesignStripe styleDesignStripe styleMedium40 minMobile game leaderboardMediumDesignDesignMedium30 minFull-text search for docsMediumDesignDesignMedium40 minReal-time leaderboardMediumDesignDesignMedium35 minE-commerce recommendation shelfMediumDesignAmazon styleDesignAmazon styleMedium45 minVector search with metadata filterMediumDesignOpenAI styleDesignOpenAI styleMedium45 minChurn prediction batch pipelineMediumDesignNetflix styleDesignNetflix styleMedium35 minSemantic search with filtersMediumDesignAmazon styleDesignAmazon styleMedium35 minAutomated model retrainingMediumDesignDatabricks styleDesignDatabricks styleMedium35 minCold-start recommendationsMediumDesignAirbnb styleDesignAirbnb styleMedium35 min