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System Design: from Code Structure to Distributed Systems

System design from the first request to distributed systems: requirements, code structure in C#, Java, Go and Rust, data, consistency, scaling, deployment, security and privacy. Every lesson is interactive, every claim is checked against its source, and every part ends with interview questions.

15 September

The Life of a Request: What Happens When You Open a URL

Rajesh Pillai Articles, System Design

Opening a web page takes a DNS lookup, a TCP handshake, a TLS handshake, and a trip through load balancers, caches, app servers and databases. Follow one real request, measured step by step, and see where the time goes.

15 September

Requirements Become Numbers: Latency, Percentiles, Availability and Estimation

Rajesh Pillai Articles, System Design

Fast” and “reliable” can’t be designed for; p99 under 300 ms and 99.9% of requests succeeding can. Learn percentiles, tail latency, why busy servers get slow, availability nines, SLOs, and back-of-the-envelope estimates.