Tag: #System Design

Showing all articles tagged with "System Design".

All AI & ML Algorithms Architecture Cost Reduction Design Systems Infrastructure Scaling Security #System Design ✕ Clear

Scaling

How Bitly Scaled Technically: The Engineering Story Behind Billions of Redirects and a $100M+ ARR Platform

When you click a bit.ly link, it feels instantaneous. Behind the simplicity is a battle-tested system that scaled to billions of redirects through Base62 encoding, heavy caching, NSQ async pipelines, and a major MySQL-to-Bigtable migration. This engineering foundation powered Bitly’s growth from a viral URL shortener to a $100M+ ARR Connections Platform. The story showcases how thoughtful architecture turns simple ideas into resilient global infrastructure.

Jul 22, 202612 min readRead →

Security

How WhatsApp Encrypts Your Messages So Not Even WhatsApp Can Read Them

WhatsApp encrypts every message with Signal's X3DH handshake and Double Ratchet algorithm, so even WhatsApp's own servers never see plaintext. Here's how identity keys, pre-keys, per-message ratcheting, and Sender Keys work together to secure 1:1 chats, groups, and attachments end-to-end

Jul 22, 202620 min readRead →

Cost Reduction

How iLovePDF Reduces Infrastructure Costs: The Engineering Behind Its Low-Cost PDF Platform

Millions of PDFs are processed through iLovePDF every day, yet the platform remains fast, reliable, and surprisingly cost-efficient. This article explores the engineering decisions behind that efficiency, from hybrid cloud infrastructure and temporary file storage to load balancing, smart processing pipelines, CDNs, and feature gating. Learn how iLovePDF minimizes infrastructure costs while delivering a seamless experience to millions of users worldwide.

Jul 17, 202616 min readRead →

Infrastructure

How Telegram Talks to a Billion People at Once (Without Falling Over)

Telegram moves billions of messages a day across a custom-built backend that skips most of the standard cloud playbook – no managed databases, no conventional load balancers, just a purpose-built protocol and a web of data centres designed so no single failure takes the system down. This piece breaks down exactly how that architecture works, from home data centres and message routing to why a famously small engineering team has been enough to keep it all running.

Jul 12, 20269 min readRead →

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