Designing TikTok from Scratch — A System Design Deep Dive

<p>You open amazon.com. A product page loads in under a second. Behind that single page load, your request hit a DNS server, bounced through a CDN edge node, passed a rate

<p>Most applications don't fail because of bad code.</p> <p>They fail because of bad architecture decisions made early that nobody questioned <br /> until it was too late.</p>

<blockquote> <p>The pager went off at 2:14 AM.</p> </blockquote> <p>If you’ve spent any time operating distributed systems, you know that sound. It doesn’t just wake you up; it

<p>Most developers underestimate how hard messaging systems really are.</p> <p>A basic chat demo with WebSockets is easy to build. A production-grade messaging platform like

<blockquote> <p><em>I hadn’t planned a two-part series, but as I write it’s become clear the topic can’t be contained in a single article.</em></p> </blockquote> <p>Modern backend

<ul> <li> <strong>Book:</strong> <a href="https://www.amazon.com/dp/B0GX2SQ594" rel="noopener noreferrer">System Design Pocket Guide: Interviews</a> </li> <li> <strong>Also by

<p>You use Swiggy every day. You scroll Instagram every hour. You book Uber without thinking twice.</p> <p>But have you ever wondered how does any of this actually work?</p>

<p><em>Interview prep series: real problems, real trade-offs, no hand-waving.</em></p> <h2> The Problem Worth Solving </h2> <p>Here's a scenario straight from a fintech startup I