A System Design Interview evaluates your ability to build robust, scalable systems. Unlike coding interviews, which typically seek a single correct solution, System Design involves open-ended discussions with multiple valid approaches.
Many engineers struggle with these interviews because they haven’t worked on large-scale systems. A structured approach makes preparation much easier. After running hundreds of System Design interviews, I’ve found there are a few repeatable patterns that consistently work. With practice, you can approach most design questions methodically instead of improvising. These interviews test how you reason about tradeoffs, not just what you know. Success comes from clarifying the problem, breaking it down, and proposing a solution you can justify.
The author’s background in System Design
I’m Fahim ul Haq, co-founder of Educative and co-author of this course. In April 2008, I joined an internal Microsoft team building a distributed storage system. Amazon had launched S3 in 2006, and Google introduced App Engine the same month I joined the team. We were operating at the beginning of the cloud infrastructure race. Less than two years later, that project became Microsoft Azure.
When I moved from the Exchange team to Azure, I understood storage systems but not globally distributed architectures. I learned distributed systems in production. That experience shaped how I approach System Design. These concepts now show up regularly in System Design interviews and in ...