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Artificial Intelligence

How ChatGPT Works - LLM Explained

How ChatGPT and large language models work: tokens, next word prediction, training on huge text, and why they sound so human.

@ariaonai391

System design

Designing the Twitter Feed

News feed design: fan out on write versus fan out on read, timeline caching, and ranking. The core social feed interview problem, drawn clearly.

@lucassysd013

System design

Design a Ride Hailing Service (like Uber)

How ride hailing works behind the scenes on Azure: rider and driver apps, API gateway, a matching service with a Redis geo index, trip lifecycle with Cosmos DB and Azure Maps for ETA, surge pricing, payments, and an Event Hubs to Synapse analytics pipeline. Two levels: open each container to see the detail.

@nadiabuilds012

System design

Design a Chat System (like WhatsApp)

How a WhatsApp style chat system works on AWS: WebSocket chat servers, a Kafka message queue, presence, a Cassandra message store, offline push through SNS, and an S3 plus CloudFront media pipeline. Two levels: open each container to see the detail.

@nadiabuilds09

Software architecture

Netflix Microservices Architecture

A reference model of how a large streaming platform structures microservices: API gateway, service discovery, resilience with circuit breakers, and CDN. Illustrative, not internal.

@marcusops248

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