SYS.BLOG
Launching SysDesignLab: Learn System Design by Building It
An interactive platform for mastering system design hands-on — drag-and-drop sandbox, guided tutorials, and a scenario simulator to stress-test your architectures. Free to start, $20 Advanced Pack.
SysDesignLab is an interactive platform for learning system design by actually doing it, not just reading about it.
Why I Built It
System design is one of those topics where passive learning only gets you so far. You can read every article about load balancers and consistent hashing, but until you've actually placed the components and traced the data flow yourself, it doesn't fully click. As an ex-Meta software engineer who's been through the interview loop on both sides, I wanted to build a tool that makes the hands-on practice accessible to everyone.
What's Inside
- Drag-and-drop sandbox — place components (servers, load balancers, databases, CDNs, message queues) and connect them to build real architectures
- Guided tutorials — step-by-step walkthroughs for classic problems: Design a URL Shortener, Build a Real-Time Chat, Design a Search Engine, and more
- Scenario Simulator — stress-test your designs against real-world conditions like network partitions, server failures, and traffic surges
- Theory Hub — reference material on CAP theorem, sharding, replication, and distributed systems fundamentals
Pricing
Free lessons are available immediately — start with "Design a URL Shortener" to get a feel for the sandbox. The Advanced Pack unlocks 10+ in-depth tutorials for a one-time $20 payment. No subscription.
Who It's For
Anyone preparing for software engineering interviews at top tech companies, or engineers who want to sharpen their distributed systems intuition. The hands-on format is deliberately different from reading case studies — you build the design, validate it, and break it.
Give it a try at sysdesignlab.net and let me know what you think.