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Learn DSA and system design by changing the input and watching what happens. Pick one experiment below. No account, payment or installation needed.

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Make a prediction, run the model, then explain what changed.

DSA · Trees

Which value comes next?

Visit left, then the node, then right. On a binary search tree, this produces sorted values.

Try this: Pause the traversal. Predict the next value, then step forward to check.

Try Inorder traversal

System design · Reliability

Where do requests go after a crash?

Explore how health checks remove a failed server and how the remaining servers share the work.

Try this: Crash one server. Watch the event log and failed requests until health checks notice.

Try Load balancing

DSA · Interview patterns

Can you find the pair in one pass?

Use a hash map to find two values that add up to a target, while keeping their original indexes.

Try this: Change the target sum. Predict a pair, then step through the map lookups.

Try Two Sum with a hash map

Keep learning, one concept at a time

DSA

Coding interview foundations

Start with Two Sum, then explore pointers, windows, searching and more. Follow the Java code and check yourself with topic quizzes.

Start the DSA path

System design

Backend fundamentals

Follow five topics from networking to load balancing, caching, cache eviction and the API gateway.

Start the backend path

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