High Level Design, LLD & Distributed Systems

How to architect a video sharing platform serving 1B+ hours daily. Deep dive into chunked upload, DAG transcoding pipelines, and multi-CDN caching.

Architecting a high-throughput geospatial dispatch system using Google S2 / H3 hex cells, Redis geospatial indices, and WebSocket location streaming.

Inside the architecture of a global chat application handling 100B+ messages daily. Connection multiplexing, transient message queues, and Signal E2EE protocol.

How Netflix delivers 15% of global internet traffic. An architectural exploration of custom Open Connect appliances, dynamic video encoding, and recommendation graphs.

Surviving 1M+ simultaneous requests on a single product. Learn how to architect distributed inventory locking, Redis Lua scripts, and virtual waiting rooms.

How Twitter handles 500M tweets per day and delivers personalized home feeds in <100ms. An in-depth analysis of write-fanout, read-fanout, and hybrid approaches.

Architecting an internet-scale crawler crawling 10B+ pages monthly. Deep dive into URL frontier management, host-based politeness, and SimHash deduplication.

Architecture secrets of mission-critical payment gateways: Distributed idempotency layers, double-entry general ledgers, and zero-loss webhook delivery.

Architecting a global cloud sync platform. How to handle multi-gigabyte files, chunk deduplication, bandwidth-saving delta sync, and collaborative edit conflicts.

Mastering the URL shortener design. Learn distributed ID range generation, Base62 vs cryptographic hashing, Bloom filters, and 100:1 read-heavy caching strategies.

How Airbnb manages millions of property listings and instant bookings. Deep dive into calendar availability bitmasks, optimistic locking, and dynamic pricing.

Protecting microservices from DDoS, scraper bots, and cascading overload. Detailed comparison of Token Bucket vs Sliding Window Counter with atomic Redis Lua scripts.