# System Design
All System Design notes →Chapter 1 — What Changes at L6/L7
Why the bar shifts from correct designs to defensible trade-offs, and what interviewers are actually scoring for at the Principal/Staff level.
system-design mindset book
Chapter 2 — Thinking in Systems
Feedback loops, bottlenecks, failure domains, and Conway's Law as the lens principal engineers use to reason about a system before drawing a single box.
system-design mindset book
Chapter 3 — Performance Fundamentals
Latency, throughput, tail latency, Little's Law, queueing theory, Amdahl's Law, and the Universal Scalability Law as the quantitative vocabulary for every capacity conversation.
system-design mindset book