Vertical vs Horizontal Scaling: How Do Real Systems Handle Growth?
Imagine you have just launched a web application. At first, everything is simple. You have a backend server, a database, and a few users. Users ↓ Ba…
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Designing an Online Auction / Bidding System
An online auction system is a platform where sellers put items up for auction and buyers compete by placing bids. A simple example would be: A selle…
Clock Synchronization in Distributed Databases
Part 1: The Physical Clock Problem, Quartz, NTP, and Why Time Lies This is Part 1 of a 5-part series on clock synchronization in distributed databas…
Fast... But Wrong? Meet Cache Invalidation
This is Part 7 of my "From One User to One Million" series, where we'll build an understanding of System Design by following a simple application as…
Designing a Backend System That Handles 100K Requests/Second (Without Melting Your Database)
TL;DR Architecture At high level: Global Traffic Routing (Geo DNS / Anycast) Edge Layer (CDN + WAF + Rate Limiting) Load Balancers (L4 + L7) Statele…
When Servers Aren't the Problem: The Database Bottleneck
What You'll Learn By the end of this article, you'll understand: Why applications can still become slow even after adding more servers. Why the data…
Redis Cluster Won't Shard Your Hot Leaderboard
"We use Redis Cluster" can mean two very different things: Our dataset is distributed across Redis nodes. Every individual data structure is distrib…
The Day the Warehouse Burned: Lessons in Cross-Border System Resilience
A fire in a fulfillment center on the far side of the world. It didn't make headlines. But for a cross-border e-commerce operation， it was a quiet c…
Polling: When "Simple" Starts Sending Millions of Requests
Imagine you're building a SaaS platform. Nothing fancy. Just a notification bell in the top-right corner. When someone receives a new message, compl…
Designing a Notification System That Doesn't Fall Apart
Every application eventually reaches the point where it needs notifications. At first, it feels simple. A user signs up? Send an email. Someone like…
Peak Load Is the Steady State
The product drop had been planned for months. The direct-to-consumer subscription business had run three separate load tests, provisioned extra capa…
RAG Retrieval Gotchas at Scale: Insights and Solutions
RAG Retrieval Gotchas at Scale: Insights and Solutions Retrieval-Augmented Generation (RAG) has become a popular technique for enhancing natural lan…
How We Prevented Magento Checkout Deadlocks for a Big Retailer During Traffic Surges
Handling checkout deadlocks during peak traffic is a critical challenge for enterprise Magento merchants. In this post, I’ll share how we tackled Ma…
How Databases Impact System Scalability and Speed in Software Engineering
Databases are core to most software systems, and their design directly influences both scalability and performance. Here’s what every engineer shoul…
Kubernetes Admin Seeks to Identify Advanced Concept Gaps for Improved Cluster Management Expertise
Introduction to Advanced Kubernetes Concepts As a self-taught Kubernetes cluster administrator overseeing global, multi-cluster environments, you ha…
Understanding Interfaces, Traits, and Dynamic Method Dispatch: Bridging Theory and Real-World Applications
Technical Reconstruction: Interfaces, Traits, and Dynamic Method Dispatch Main Thesis: Understanding the 'why' behind Interfaces, Traits, and Dynami…
Nonprofit Seeks Cost-Effective Website Alternatives to $15,000 Wix Solution for Complex Features
The $15K Wix Dilemma: Why Nonprofits Should Think Twice A nonprofit employee recently raised a red flag: their organization is considering a $15,000…
I Spent a Decade Chasing Microservices Before Realizing What Scalability Actually Means
A few years ago, I was staring at a red, blinking monitoring dashboard. The system I was looking at had all the modern shiny technology: Kubernetes,…
Why Your AI Workflows Break at Scale—And How to Build Systems That Don't
Why Your AI Workflows Break at Scale—And How to Build Systems That Don't You optimized your AI workflows perfectly—until you scaled them, and sudden…