System Design Interview: A Step-By-Step Guide

In summary, the most interesting aspect of this video is the structured, time-boxed approach it proposes to transform a stressful, open-ended system design interview into a predictable four-step process focused on requirements, high-level design, deep dives, and synthesis.

• Follow a 4-step framework: Understand the problem, Propose high-level design, Design deep dive, and Wrap up.
• Allocate specific time slots: 5m for requirements, 20m for high-level design, 15m for deep dive, and 5m for wrapping up.
• Clarify both functional features (prioritized) and non-functional requirements (scale and performance) early on.
• Use back-of-the-envelope calculations to establish the order of magnitude for system scale.
• Start high-level design with API definitions (RESTful) before moving to diagrams.
• Create a high-level blueprint including load balancers, services, and data storage layers.
• Define data models and schemas, focusing on access patterns and read/write ratios.
• Use the deep dive section to address bottlenecks, propose multiple solutions, and discuss trade-offs with data.
• Summarize unique design aspects during the wrap-up to conclude the session.