Build a QR Code Generation and Analytics Service Free
Design a system that generates dynamic QR codes at scale, tracks every scan with device and location metadata, and lets users update the destination URL without regenerating the QR code.
Build a RAG Pipeline for an Enterprise Knowledge Base Premium
Design a Retrieval-Augmented Generation pipeline that ingests internal documents, chunks and embeds them, retrieves the most relevant context for each query, and re-ranks results before passing them to the LLM.
Build a Real-Time Analytics Dashboard at 100B Events Premium
Design a product analytics system that ingests billions of events per day, supports sub-second aggregate queries over arbitrary time windows, and powers live dashboards without precomputing every possible metric.
Build a Real-Time Fraud Detection Engine Premium
Design a fraud detection system that evaluates every payment transaction in under 100ms using behavioral, velocity, and network signals, updates risk models continuously, and minimizes false positives that block legitimate users.
Build Reddit's Post Ranking Algorithm Premium
Design a post ranking system that combines upvotes, downvotes, time decay, and engagement signals into a score that keeps feeds fresh without requiring full recomputation on every page load.
Build a Ride-Pooling Matching Engine Premium
Design a matching system that pairs multiple riders with overlapping routes into a single vehicle, calculates detour cost for each combination, and finds the optimal set of matches across thousands of concurrent requests within 2 seconds.
Build a Self-Healing Service Mesh Premium
Design a service mesh that continuously monitors the health of every service instance, automatically reroutes traffic away from degraded nodes, and triggers remediation actions without human intervention.
Build a Semantic Search Engine with Hybrid Ranking Premium
Design a search engine that combines keyword-based BM25 scoring with dense vector similarity to handle queries where exact keyword matches are absent but semantic intent is clear.
Build a Shadow Traffic / Dark Launch System Premium
Design a traffic mirroring system that duplicates live production requests to a canary service in real-time, compares responses for divergence, and generates a confidence report without any user-visible impact.
Build Slack's Channel Message Fan-Out and Unread Counts Premium
Design a messaging system that delivers channel messages to thousands of members in a large workspace, maintains accurate unread counts per user per channel, and syncs read state across multiple devices.