System Design Interview Fundamentals Rylan Liu Pdf Jun 2026

This is the most advanced fundamental.

: Covers the building blocks of distributed systems, including load balancing, caching, and database sharding. System Design Interview Fundamentals Rylan Liu Pdf

Distributing incoming traffic across multiple app servers. Stateless Microservices: Segregated business logic layers. Storage Layer: Primary databases and basic caching layers. Step 3: Deep Dive into Critical Components (15-20 Minutes) This is the most advanced fundamental

Every read receives the most recent write or an error. Stateless Microservices: Segregated business logic layers

| Question | Key Focus Areas | |---|---| | | Real-time matching, location tracking, pricing algorithms | | Top Watched YouTube Video | Analytics aggregation, caching strategies, real-time updates | | Emoji Broadcasting | Real-time messaging, delivery guarantees, scalability | | Distributed Counter | Strong consistency, eventual consistency, leader election | | Cloud File Storage | Data durability, metadata management, upload/download optimization | | Rate Limiter | Algorithm selection (token bucket, sliding window), distributed coordination | | Chat Application | Real-time communication, message ordering, presence management |

Given a long URL, return a short URL. Clicking the short URL redirects to the original.

| Concept | Explanation | |---------|-------------| | | Add more CPU/RAM to a single server – simple but limited. | | Horizontal scaling | Add more servers behind a load balancer – preferred for large systems. | | Load balancing | Distribute traffic across servers (Round Robin, Least Connections, IP Hash). | | Stateless services | Store session data externally (e.g., Redis) – essential for horizontal scaling. | | Database scaling | Read replicas, sharding, or moving to NoSQL for high write loads. |