TradeStack – The Zerodha System Design Show

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1. 

   S1 · E13 · 9 Dec 2025 · 17 min

   The K in OK - Top K Recommendation System

   YouTube’s recommendation engine works overtime to find your personal top picks. We explore how it filters candidates, scores them, and ranks the winners—kind of like a talent show, but with neural networks and way less singing.

2. 

   S1 · E12 · 8 Dec 2025 · 15 min

   Swipe Right on Payments

   Why does a simple “Buy Now” click trigger a whole fintech orchestra? We unpack the tech behind modern payment gateways—auth flows, settlement, risk checks, and the whole vibe. Secure payments, but make it digestible.

3. 

   S1 · E11 · 7 Dec 2025 · 16 min

   Crawl Me Maybe

   Ever wondered how websites get scraped, indexed, and turned into searchable magic? We break down web crawlers—how they think, how they roam, and why they occasionally break the internet. System design made fun, chaotic, and actually understandable.

4. 

   S1 · E10 · 6 Dec 2025 · 16 min

   Next Up: Your New Addiction

   YouTube’s recommendation engine is basically that friend who gets you. But how does it work? We decode the machine-learning magic, the watch-time traps, and the wild design behind what you click next. Nerdy, relatable, and dangerously bingeable.

5. 

   S1 · E9 · 5 Dec 2025 · 13 min

   Cache Me If You Can

   Welcome to Cache Me If You Can , the podcast where we break down the chaotic, beautiful world of distributed caching—no gatekeeping, no buzzword soup. Just real talk about scaling apps, avoiding outages, and surviving the latency monster. If you’re a dev, an architect, or just cache-curious, this pod’s for you.

6. 

   S1 · E7 · 3 Dec 2025 · 10 min

   Behind the Metrics: Architecting an Ad Click Aggregator

   Ever wondered how advertising platforms count ad clicks so fast and so accurately? This episode explores the engineering and distributed systems magic that powers an Ad Click Aggregator . From Kafka streams to time-windowed aggregations, from fault tolerance to at-least-once semantics, we break it down in a practical and engaging way. Perfect for engineers and analytics enthusiasts.

7. 

   S1 · E6 · 3 Dec 2025 · 14 min

   Inside the Instant Delivery Engine: System Design of Gopuff, Blinkit & Zepto

   In this episode, we break down the real-time system architecture behind ultra-fast delivery platforms like Gopuff, Blinkit, and Zepto . We explore how these companies scale dark stores, manage inventory accuracy, optimize delivery routes, handle surge demand, and maintain ultra-low latency order fulfillment. This is a deep-dive, interview-style walkthrough ideal for anyone preparing for system design interviews .

8. 

   S1 · E5 · 2 Dec 2025 · 15 min

   Sold! The Online Auction Show

   Sold! is the definitive podcast for anyone curious about the technology, architecture, and engineering behind modern online auction platforms. Whether you’re a system designer, developer, product builder, or tech enthusiast, this show takes you deep into the systems that power real-time bidding, high-traffic marketplaces, payment flows, fraud detection, and scalable data architectures.

9. 

   S1 · E4 · 2 Dec 2025 · 14 min

   Tiny Links, Big Impact

   Short links, long conversations. We discuss how URL shortening transforms marketing, boosts conversions, and simplifies user journeys. Perfect for marketers, developers, and anyone building better links.

10. 

    S1 · E3 · 1 Dec 2025 · 16 min

    Scheduling Chaos: Designing a Distributed Job Scheduler

    Ever wondered how massive systems schedule thousands of tasks every second? In this episode, our duo explores the system design of a distributed job scheduler—unpacking queues, workers, heartbeat mechanisms, leader election, consistency models, and more. An intuitive, story-driven breakdown of one of the most essential components in modern distributed systems.