System design topics

Every hands-on lesson, organised by the concept it teaches — from rate limiting and sharding to Kafka, RAG and AI agents. Each topic starts you on a free lesson.

Scalability & traffic

Caching 38 lessons Rate Limiting 16 lessons Backpressure & Flow Control 10 lessons Load Balancing 7 lessons CDN & Edge 3 lessons

Data

Storage Engines & Indexing 38 lessons Consensus & Leader Election 18 lessons Sharding & Partitioning 17 lessons Replication 9 lessons Distributed Transactions 7 lessons Consistent Hashing 5 lessons Consistency Models & CAP 4 lessons Search & Full-Text Indexing 3 lessons

Messaging & streaming

Kafka 17 lessons Log Processing 10 lessons Message Queues & Pub/Sub 10 lessons Stream Processing 7 lessons Event Sourcing & CQRS 5 lessons

Services & APIs

Resilience: Circuit Breakers & Retries 30 lessons Authentication & Authorization 15 lessons API Design: REST, gRPC & GraphQL 13 lessons Idempotency & Exactly-Once 12 lessons Microservices 10 lessons Real-Time: WebSockets & Push 6 lessons

Operations

Observability: Metrics, Logs & Tracing 65 lessons Docker & Containers 26 lessons Kubernetes 12 lessons Service Discovery & Configuration 9 lessons

AI systems

AI Agents 27 lessons LLM Serving & Inference 16 lessons MLOps 9 lessons Embeddings & Vector Databases 6 lessons RAG: Retrieval-Augmented Generation 4 lessons