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System Design · Professional Networking Designing a Job Recommendation System for a Professional Networking Platform How do platforms like LinkedIn quietly figure out that you, specifically, should see this job and not that one — out of millions of postings, updated every second, for hundreds of millions of people? We…
Designing a Live-Streaming System That Survives a Mid-Broadcast Viral Spike A production-grade blueprint for scaling a single live stream from a few hundred viewers to millions within minutes — without buffering, without falling behind, and without the broadcaster ever noticing. 01 · Intro & History02 · Problem03 · Core Concepts04…
Designing a Live Shopping Platform with Real-Time Inventory A complete, ground-up architecture for a system where a creator sells products live on video, thousands of viewers watch and chat in real time, and every purchase must update inventory instantly and correctly — even when ten thousand people click “Buy” on…
Designing Live Commenting & Reactions for Millions of Concurrent Viewers A single tap of a heart. A one-line comment during the final seconds of a match. Multiply that by ten million people watching the same moment at once, and you have one of the hardest real-time fan-out problems in distributed…
A complete, from-scratch walkthrough of how a marketplace platform lets customers earn points from purchases and redeem them across a wide range of rewards — covering ledger architecture, real-time balance tracking, redemption orchestration, fraud prevention, scaling, and the production patterns behind it.
A complete, ground-up walkthrough of how to build a real-time score and stats system that can serve tens of millions of fans watching the same match at the same second — covering architecture, data flow, databases, caching, scaling, reliability, and the trade-offs behind every decision.
Designing a Unified Feed for Text Posts and Long-Form Video A complete, interview-ready walkthrough of building one feed architecture that can seamlessly serve short text posts and long-form video content — from ingestion and transcoding to ranking, fan-out, caching, and global delivery at millions of requests per second. 01 ·…
Designing an Influencer Marketing Attribution Platform How do you track a sale that happens on Shopify, Amazon, and a brand’s own website — and prove, with confidence, that it happened because of a video a creator posted three days ago on Instagram? This deep dive builds that system from first…
Designing a Hybrid Marketplace: Instant Digital Delivery + Physical Shipment in One Checkout A production-grade architecture for a marketplace where a single cart, a single checkout flow, and a single order can contain a software license that must be delivered in milliseconds and a physical product that must travel through…
Designing an Idempotent Payment Processing System How to guarantee a transaction is charged exactly once, even when a client retries after a network timeout — at a scale of millions of requests per minute. A ground-up walkthrough of the client-generated idempotency key, the layered defences behind it, and every trade-off,…