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Fahim ul Haq is the co-founder and CEO of Educative, the world's leading upskilling platform for and by developers. He is a former software engineer at Microsoft and Facebook with a deep passion for creating better, more efficient ways for developers to master in-demand skills.
Preparing for a System Design mock interview is one of the fastest ways to strengthen your real interview performance, especially if you’re targeting mid-level or senior engineering roles. System Design
When you walk into a Google ML System Design interview, you’re not just designing a storage system or a microservice; you’re designing the backbone of an intelligent, evolving product. Google
When interviewers ask you to design something like Google Drive, they’re really testing whether you can think through large-scale storage systems in a logical, structured way. The question may sound
When you walk into a System Design interview today, you’re no longer just expected to know how to design a URL shortener or a chat application. Interviewers increasingly want to
When interviewers ask you to design Twitter System Design, they aren’t looking for you to rebuild the entire Twitter platform. Instead, they want to understand whether you can take a
If you’ve ever tried to take a machine learning model from your notebook into production, you already know the truth: building a model is easy; designing the whole system around
Most engineers feel overwhelmed when preparing for System Design interviews, partly because System Design seems limitless, and partly because interviewers expect clarity under extreme time constraints. The good news is
System Design interviews continue to play a defining role in software engineering hiring, especially for mid-level, senior, and architect roles. Even in 2026, when AI-assisted coding and automated infrastructure tools
The Deliveroo System Design interview is uniquely challenging because it blends real-time logistics, geospatial computation, marketplace matching, and mission-critical operations that influence real-world outcomes. Unlike purely digital platforms, Deliveroo coordinates
The Snap System Design interview is unique because it focuses on real-time, mobile-first, camera-powered, and ephemeral communication systems. Unlike typical social platforms, Snapchat’s core experience revolves around sending and receiving