System Design Interview Preparation Guide for International Students
This guide covers how to approach system design interviews at large US technology employers. It compares two frameworks for structuring an answer, breaks down what four well-known companies tend to emphasise, offers a practice question library graded by difficulty, and provides a reference for the architectural building blocks interviewers expect candidates to name and justify. It is written for international students and professionals interviewing for engineering roles that may involve visa sponsorship.
Two frameworks for structuring your answer
The guide compares RESHADED — Requirements, Estimation, System APIs, High-level Design, Advanced Features, Deep Dive, Evaluation and Discussion — against a simpler four-step approach of Clarify, Estimate, Design, Deep Dive. Each is presented with its trade-offs: the longer framework is thorough but takes more time, while the four-step version is easier to remember and better suited to shorter, time-constrained interviews.
What different employers tend to emphasise
Selecting Google, Meta, Amazon or Netflix surfaces that company's typical interview length, stated difficulty, focus area and a set of commonly reported questions. The stated emphases differ: scalability and global distribution, real-time and social-graph problems, reliability and cost optimisation, and streaming and content delivery respectively. These are preparation heuristics rather than official company statements.
A practice question library graded by difficulty
Questions are grouped as Easy, Medium and Hard, each listed with an approximate time budget, the key topics it tests and companies known to ask it. Examples range from a URL shortener and a parking garage system, through chat systems, ride-sharing and timeline generation, up to video streaming platforms and web search.
Core components and common interview mistakes
A reference section explains what load balancers, databases, caches, message queues, CDNs and API gateways do and when each is appropriate. Alongside it are checklists for preparing beforehand, conducting yourself during the interview — clarify before designing, start simple, reason out loud — and the mistakes that most often cost marks, such as over-engineering for the given scale or never discussing trade-offs.