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# Live Tech Examples
Hands-on system design concepts you can interact with right in your browser.
URL Shortener
Explore how URL shorteners work under the hood: base62 encoding, hashing, caching strategies, and redirect semantics.
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Social Graph β TAO
Discover how Facebook's TAO models billions of relationships as objects and associations, with two-tier caching and graph queries.
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AWS Lambda β Part 1
An interactive deep-dive into Function-as-a-Service: invoke a simulated Lambda, watch microVMs spin up, and see cold starts, billing, and concurrency in action.
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