Learn System Design by Building It

Most developers learn system design by watching videos, reading blogs, or memorizing interview patterns. Real engineering doesn't work that way.

SDSim is an interactive system design simulator that lets you design, test, and evolve distributed systems through hands-on practice. Instead of consuming architecture diagrams, you build them, break them, and understand why they succeed or fail.

Whether you're preparing for system design interviews, learning distributed systems, or improving as a backend engineer, SDSim helps you develop intuition through experimentation—not memorization.

What you can do

• Solve interactive architecture puzzles that gradually increase in complexity, from URL shorteners and chat applications to large-scale distributed systems.

• Design on a visual canvas using real infrastructure components like Load Balancers, CDNs, API Gateways, Caches, Databases, Queues, Workers, Object Storage, and Message Brokers.

• Simulate real traffic to understand latency, throughput, bottlenecks, scalability, and high availability.

• Experiment with architecture trade-offs by comparing multiple designs and seeing how different decisions affect system behavior.

• Run chaos experiments to intentionally introduce failures and learn how resilient architectures recover.

• Explore cloud-agnostic architectures or model systems inspired by AWS, Azure, and Google Cloud services.

• Practice freely in Sandbox Mode or follow guided challenges designed to teach core system design principles step by step.

• Save and share your designs with teammates, mentors, or interview partners.

Why SDSim?

System design is difficult because most resources are passive. You can read about load balancers, caching, queues, and replication for hours without ever developing the intuition needed to design scalable systems.

SDSim bridges that gap by turning system design into an interactive engineering experience. Build architectures. Test assumptions. Break your systems. Improve them. Repeat.

Because the best way to learn distributed systems is to build distributed systems.