Answers

If you’ve ever reached the point in a project where “draw the architecture” turns into “define the interfaces and methods,” you’ve already stepped into the world of low-level design, even if you didn’t realize it. So let’s start with the big question: What is low-level system design? While high-level system design gives you the architectural overview—the city map—low-level system design is the street-by-street layout. It’s where you define the internal logic of each component, the structure of your APIs, the shape of your data, and the communication patterns between classes...

When it comes to tech interviews, no stage causes more anxiety and more strategic opportunity than the system design round. Whether you're gunning for a backend role at Meta or a full-stack position at a startup, you're likely to face an open-ended question like: "Design Twitter at scale." "Build a real-time chat application." "Architect a URL shortener with 10M daily users." These questions don't just test your technical depth; they assess your ability to make trade-offs, communicate clearly, and think structurally under pressure. And here's the hard truth: your ability...

You’re in the hot seat. You prepared for the system design interview. The interviewer leans forward and says, “Design Twitter.” There’s no starter code. No test cases. Just a whiteboard and a timer ticking in your head. This is where you prove you’re an engineer who can build and reason about real-world system design examples. But here’s the thing: you don’t need to be a staff-level architect to shine in a system design interview. What you do need is a clear, structured approach. One that shows you know how to...

Choosing the right database isn’t just a technical choice—it’s a critical design decision that can define how your system scales, maintains consistency, and handles real-world demands. Whether you're tackling a system design interview or building a production system, understanding the tradeoffs between SQL and NoSQL will set you apart. In this blog, we'll explore when to use MySQL (relational) vs. NoSQL (non-relational), how performance shifts under load, and what interviewers actually want to hear when you make that call. Why this tradeoff matters in system design interviews System design is...