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Engineering posts that the wider community — Hacker News, Reddit, Lobste.rs — treated as important.
Cloudflare suffered a service outage on November 18, 2025. The outage was triggered by a bug in generation logic for a Bot Management feature file causing many Cloudflare services to be affected.
Over the past months, we’ve left our macOS model behind and moved to Codespaces for the majority of GitHub.com development.
Meta has been on a years-long undertaking to translate our entire Android codebase from Java to Kotlin. Today, despite having one of the largest Android codebases in the world, we’re well pas…
Shopify shares some of the lessons we learned and solutions we built in order to run Airflow at scale.
Online payment processing for internet businesses. Stripe is a suite of payment APIs that powers commerce for businesses of all sizes.
Summary In recent years, cellular architectures have become increasingly popular for large online services as a way to increase redundancy and limit the blast radius of site failures. In pursuit of these goals, we have migrated the most critical user-facing services at Slack from a monolithic to a cell-based architecture over the last 1.5 years.…
Earlier today, Cloudflare terminated the account of the Daily Stormer. We've stopped proxying their traffic and stopped answering DNS requests for their sites. We've taken measures to ensure that they cannot sign up for Cloudflare's services ever again.
Perplexity is repeatedly modifying their user agent and changing IPs and ASNs to hide their crawling activity, in direct conflict with explicit no-crawl preferences expressed by websites.
Cloudflare's mission is to help build a better Internet. We're excited today to take another step toward that mission with the launch of 1.1.1.1 — the Internet's fastest, privacy-first consumer DNS service. This post will talk a little about what that is and a lot about why we decided to do it.
Today we are launching the beta of EmDash, a full-stack serverless JavaScript CMS built on Astro 6.0. It combines the features of a traditional CMS with modern security, running plugins in sandboxed Worker isolates.
At approximately 05:00 UTC on March 24, out of an abundance of caution, we replaced our RSA SSH host key used to secure Git operations for GitHub.com.
84 million requests a second means even rare bugs appear often. We'll reveal how we discovered a race condition in the Go arm64 compiler and got it fixed.
Today we're excited to announce what we began to plan more than two years ago: the 1.1.1.1 App with WARP performance and security technology. We built Warp from the ground up to thrive in the harsh conditions of the modern mobile Internet.
Today we reinstated youtube-dl, a popular project on GitHub, after we received additional information about the project that enabled us to reverse a Digital Millennium Copyright Act (DMCA) takedown.
One engineer used AI to rebuild Next.js on Vite in a week. vinext builds up to 4x faster, produces 57% smaller bundles, and deploys to Cloudflare Workers with a single command.
Cloudflare experienced a significant traffic outage on December 5, 2025, starting approximately at 8:47 UTC. The incident lasted approximately 25 minutes before resolution. We are sorry for the impact that it caused to our customers and the Internet. The incident was not caused by an attack and was due to configuration changes being applied to attempt to mitigate a recent industry-wide vulnerability impacting React Server Components.
Today, we’re launching Cloudflare Email Service. Send and receive email directly from your Workers with native bindings—no API keys needed. We're unifying email sending and routing into a single service built for developers. Sign up for the private beta.
We’re sharing lessons learned from shifting our Android development from Java to Kotlin. Kotlin is a popular language for Android development and offers some key advantages over Java. As of today,…
Today at 1651 UTC, we opened an internal incident entitled "Facebook DNS lookup returning SERVFAIL" because we were worried that something was wrong with our DNS resolver 1.1.1.1. But as we were about to post on our public status page we realized something else more serious was going on.
Setting up a new repository with all the right linters for the different types of code can be time consuming and tedious. So many tools and configurations to choose from…
Mermaid is a JavaScript based diagramming and charting tool that takes Markdown-inspired text definitions and creates diagrams dynamically in the browser.