📰 Dev.to · RONI DAS

Nested comments and a constantly shifting front page are two classic hard problems. Covers ways to store deep comment trees and the ranking formulas that decide

How the lakehouse pattern gets database guarantees on top of cheap object storage. Covers the transaction log, optimistic concurrency, and the trade-offs agains

The architectural idea that let a cloud warehouse scale reads and writes independently and bill by the second. Covers the three-layer design and the trade-offs

How a music service delivers audio with low startup latency and generates a personalized weekly playlist for every user. Covers adaptive streaming, the CDN edge

A walkthrough of how a lodging marketplace handles availability search at scale and why two guests can never book the same night. Covers the core race condition

Chat sounds like the easy case until the message table grows past what a single relational database can handle. This is the story of why Discord moved its messa

Instagram looks simple from the outside: photos and a feed. The design gets interesting the moment you ask where the photos live and how the feed stays fast for

Streaming video at global scale is less about clever code and more about where you put the bytes. This is a walk through the parts of Netflix's design that actu

A URL shortener looks like a weekend project, and the first version is. The interesting engineering shows up when you care about short codes, read speed, and ne

S3 advertises eleven nines of durability, which is a number so large it stops feeling real. Here is what that number actually means and the design choices that

WhatsApp famously ran with a tiny engineering team while serving a huge chunk of the planet. A lot of that came down to a few deliberate design choices, and mos

Matching a rider to a nearby driver in a couple of seconds sounds simple until you try to do it for millions of people at once. Here is how I would break the pr

Everyone has felt it. You open TikTok, watch four videos, and the fifth is somehow exactly your thing.