6 min read Promotions Engine Low-Level Design A promotions engine governs discount codes, automatic promotions, stackability rules, customer eligibility, budget caps, and redemption […] Read article
5 min read Returns Management System Low-Level Design A returns management system (RMS) handles the reverse logistics of e-commerce: accepting return requests, generating Read article
5 min read Refund Service Low-Level Design The refund service is responsible for calculating how much to return to a buyer, executing the Read article
5 min read Dispute Service Low-Level Design The dispute service manages the chargeback lifecycle: intake of issuer-initiated chargebacks, collection of merchant evidence, automated Read article
5 min read Checkout Service Low-Level Design The checkout service orchestrates the final steps of a purchase: reserving inventory, creating an order record, Read article
5 min read Image Recognition Service System Design Overview An image recognition service accepts raw image input, runs it through one or more Read article
5 min read Content Classifier System Design Overview A content classifier assigns one or more category labels to user-generated content: text posts, images, Read article
5 min read OCR Service System Design Overview An OCR (optical character recognition) service converts images of documents, receipts, screenshots, and scanned pages Read article
5 min read Search Suggest System Design Overview Search suggest (autocomplete) is one of the most latency-sensitive features in any product. Users expect Read article
5 min read Typeahead Service System Design Overview A typeahead service extends basic search suggest by adding session context awareness, distributed prefix indexing Read article
5 min read Timeline Service System Design Overview A timeline service collects events from multiple heterogeneous sources, imposes a consistent ordering guarantee, and Read article
5 min read Activity Stream System Design Overview An activity stream notifies users about actions taken by others in their network: likes, follows, Read article
6 min read Requirements and Constraints A risk scoring service aggregates signals from multiple data sources, runs them through an ensemble of models, Read article
6 min read Requirements and Constraints An IoT data pipeline ingests telemetry from potentially millions of connected devices, processes and enriches the stream, Read article
6 min read Requirements and Constraints A device registry is the source of truth for IoT device identity, credentials, configuration, and metadata. It Read article
