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#high-level-design

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AAAbstract Algorithmsabstractalgorithms.devMar 13 · 19 min read

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

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

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AAAbstract Algorithmsabstractalgorithms.devMar 13 · 18 min read

System Design HLD Example: Payment Processing Platform

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,

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AAAbstract Algorithmsabstractalgorithms.devMar 13 · 18 min read

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

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

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AAAbstract Algorithmsabstractalgorithms.devMar 13 · 15 min read

System Design HLD Example: Distributed Cache Platform

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

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SGSagnik Guruhld.hashnode.devFeb 28 · 7 min read

Understanding the Thundering Herd Problem

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

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SPSaurabh Pandehowthatworks.hashnode.devJan 23 · 6 min read

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

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...

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MMaverickjyanshu.hashnode.devDec 9, 2025 · 20 min read

Singleton Design Pattern

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...

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JSjaya sakthitechzen.hashnode.devNov 23, 2025 · 6 min read

5.2. Design a Global News Feed Case study

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, ...

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PKPranay Kathaledesigndecode.hashnode.devOct 22, 2025 · 4 min read

Mastering System Design: A Practical Guide to HLD and LLD

Why System Design Interviews Matter (and How to Approach Them) If you’ve ever applied for a senior software engineer or architect role, you’ve likely faced the system design interview. Unlike coding rounds where you just solve a clear problem, system...

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AMAkshit Mudgalamwrites.hashnode.devOct 9, 2025 · 4 min read

What Really Happens When You Type a URL in Your Browser

This post explains the quick, complex process your browser undergoes, including DNS lookup, TCP/TLS handshakes, HTTP requests, and server responses, in a clear and structured way. 🧑🏽‍💻 1. Browser Parsing “When we type a URL, the browser first ch...