Questions
Status
Fleet rebalancing systemHardDesignUber styleDesignUber styleHard50 minLocation fraud detectionHardDesignUber styleDesignUber styleHard50 minCausal consistency collaborationHardDesignFigma styleDesignFigma styleHard50 minActive-active order consistencyHardDesignDoorDash styleDesignDoorDash styleHard50 minCredential rotation with zero downtimeHardDesignDesignHard50 minPresence in massive roomsHardDesignMeta styleDesignMeta styleHard45 minCollaborative cursor syncHardDesignFigma styleDesignFigma styleHard50 minCollaborative spreadsheet engineHardDesignGoogle styleDesignGoogle styleHard55 minMultiplayer shooter netcodeHardDesignDesignHard50 minWebSocket gateway tierHardDesignMeta styleDesignMeta styleHard45 minReal-time driver location and matchingHardDesignUber styleDesignUber styleHard50 minMultiplayer room state and broadcastHardDesignFigma styleDesignFigma styleHard50 minCollaborative document concurrencyHardDesignFigma styleDesignFigma styleHard45 minAPI gatewayHardDesignDesignHard50 minAuthoritative DNS geo-routing failoverHardDesignAmazon styleDesignAmazon styleHard45 minCDN request routing layerHardDesignNetflix styleDesignNetflix styleHard50 minAnycast edge routing systemHardDesignGoogle styleDesignGoogle styleHard50 minMulti-region traffic failoverHardDesignNetflix styleDesignNetflix styleHard50 minTLS-terminating ingress routerHardDesignShopify styleDesignShopify styleHard45 minSIP session routing layerHardDesignCisco styleDesignCisco styleHard50 minHorizontally sharded databaseHardDesignStripe styleDesignStripe styleHard45 minCompetitive shooter netcodeHardDesignDesignHard50 minMQTT message brokerHardDesignAmazon styleDesignAmazon styleHard50 minZero-trust VPN meshHardDesignCisco styleDesignCisco styleHard45 minOffline-first collaborative syncHardDesignFigma styleDesignFigma styleHard50 minCDN purge propagation at scaleHardDesignDesignHard45 minExactly-once event publishingHardDesignStripe styleDesignStripe styleHard50 min
Live-comments during eventsHardDesignAmazon styleDesignAmazon styleHard45 minPodcast home feedHardDesignSpotify styleDesignSpotify styleHard55 minVacation rental rankingHardDesignAirbnb styleDesignAirbnb styleHard55 minReal-time personalization serviceHardDesignAmazon styleDesignAmazon styleHard50 minSponsored search rankingHardDesignAmazon styleDesignAmazon styleHard55 minCart recommendationsHardDesignAmazon styleDesignAmazon styleHard50 minVideo feed ranking servingHardDesignGoogle styleDesignGoogle styleHard45 minFeature store with point-in-time correctnessHardDesignUber styleDesignUber styleHard45 minModel monitoring without ground truthHardDesignCapital One styleDesignCapital One styleHard40 minEmbedding model migration zero-downtimeHardDesignAmazon styleDesignAmazon styleHard45 minSparse-traffic model serving platformHardDesignAmazon styleDesignAmazon styleHard45 minReal-time feature aggregationHardDesignUber styleDesignUber styleHard45 minDesign in-session personalization at scaleHardDesignNetflix styleDesignNetflix styleHard45 minMultimodal joint embedding alignmentHardDesignGoogle styleDesignGoogle styleHard45 minReal-time fraud scoringHardDesignStripe styleDesignStripe styleHard50 minETA predictionHardDesignGoogle styleDesignGoogle styleHard50 minPersonalized video feed rankingHardDesignGoogle styleDesignGoogle styleHard50 minLearning-to-rank feature assemblyHardDesignAmazon styleDesignAmazon styleHard50 minRecommendation feed generation and rankingHardDesignMeta styleDesignMeta styleHard50 minMulti-objective ranking with tunable weightsHardDesignMeta styleDesignMeta styleHard50 minANN index updates and deletesHardDesignOpenAI styleDesignOpenAI styleHard50 minSequential recommendations at scaleHardDesignMeta styleDesignMeta styleHard45 minHome page module rankingHardDesignNetflix styleDesignNetflix styleHard45 min