About System Design Sandbox

Our Mission

System Design Sandbox exists to make system design interview preparation accessible, interactive, and effective. We believe the best way to learn system design is by doing it — not just reading about it.

Traditional preparation involves reading blog posts, watching videos, and hoping you remember enough when the interview arrives. We built a platform where you can practice designing real systems step-by-step and get feedback on your approach.

What We Offer

• Interactive Practice Scenarios — Design systems like URL shorteners, messaging apps, and notification systems from scratch with guided steps.
• AI-Powered Feedback — Get instant, detailed feedback on your designs to understand what you got right and what needs improvement.
• Comprehensive Learning Guides — Deep-dive articles covering distributed systems, caching, databases, scaling, and more.
• Completely Free — All practice scenarios, articles, and feedback are available at no cost.

Who Built This

System Design Sandbox was created by a software engineer who saw firsthand how difficult it is to practice system design without a structured environment. After going through the interview process and finding no equivalent of LeetCode for system design, the decision was clear: build one.

Our Approach

Every practice scenario follows the same structure you would encounter in a real interview: define functional requirements, outline non-functional requirements, design the API, and build out the high-level architecture. This mirrors how experienced engineers approach system design in production.

The platform is built with Next.js, deployed on Vercel, and designed for performance — because an engineering tool should practice what it preaches.