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System Design HLD Example: Payment Processing Platform

Mar 13 · 18 min read · TLDR: Payment systems optimize for correctness first, then throughput. This guide covers idempotency, double-entry ledgers, and reconciliation. Stripe processes over 250 million API requests per day,

System Design HLD Example: Notification Service (Email, SMS, Push)

Mar 13 · 19 min read · TLDR: A notification platform routes events to per-channel Kafka queues, deduplicates with Redis, and tracks delivery via webhooks — ensuring that critical alerts like password resets never get blocke

System Design HLD Example: File Storage and Sync (Dropbox and Google Drive)

Mar 13 · 18 min read · TLDR: Cloud sync systems separate immutable blob storage (S3) from atomic metadata operations (PostgreSQL), using chunk-level deduplication to optimize storage costs and delta-sync events to minimize

System Design HLD Example: Distributed Cache Platform

Mar 13 · 15 min read · TLDR: Distributed caches trade strict consistency for sub-millisecond read latency, using consistent hashing to scale horizontally without causing database-shattering "cache stampedes" during cluster

SGSagnik Guruhld.hashnode.dev

Understanding the Thundering Herd Problem

Feb 28 · 7 min read · Imagine you own an electronics store and recently became the exclusive dealer for a new gaming console called XStation. Sales are steady and manageable—until one morning, Rockstar Games announces that

SPSaurabh Pandehowthatworks.hashnode.dev

Unlocking YouTube's "Time Machine"- How a 20-Year-Old Video Gets Summarized in Seconds!

Jan 23 · 6 min read · Yesterday, normally I was just watching YouTube videos and reading comments, and goes for video summarization section and asked my question about the video. But suddenly I clicked that this video is nearly 15 years old and still YouTube summarizes it...

MMaverickjyanshu.hashnode.dev

Singleton Design Pattern

Dec 9, 2025 · 20 min read · The Singleton Design Pattern is one of the most widely known and frequently used creational design patterns in software engineering. It ensures that a class has only one instance throughout the application lifecycle and provides a global point of acc...

JSjaya sakthitechzen.hashnode.dev

5.2. Design a Global News Feed Case study

Nov 23, 2025 · 6 min read · Design a Global News Feed: Let's Build a Modern Social Network! Ever wondered how Facebook, Twitter (X), or Instagram deliver personalized news feeds to millions of users worldwide? It's a complex system, but don't worry, we'll break it down! Today, ...