
The best problem-solving writing in software engineering — databases, performance, security, frontend and distributed systems, in one feed.


Import maps are great for both performance and developer experience, but their original limitations made them hard to use, especially at Shopify’s scale. We stepped up and pushed changes across the HTML spec, Chromium and WebKit to fix these issues at the web platform level. Now, developers can interleave JavaScript modules and multiple import maps on their HTML pages without worrying about correc

The web is mired in a struggle to eliminate third-party cookies, with the World Wide Web Consortium Technical Architecture Group leading the charge. But there are obstacles preventing this from happening, and, as a result, many essential web features continue to rely on cookies to function properly. That’s why detecting third-party cookie blocking isn’t just good technical hygiene but a frontline

Maintaining and developing complex and risky code is never easy. See how we addressed the challenges of securing our SAML implementation with this behind-the-scenes look at building trust in our systems.

What’s the difference between data, findings, and UX insights? And how do you argue for statistical significance in your UX research? Let’s unpack it.

See how to use GitHub Copilot to engage in some test-driven development.

For the third consecutive year, Gartner has named Cloudflare to the Gartner® Magic Quadrant™ for Security Service Edge (SSE) report.

In this post, I’ll look at CVE-2025-0072, a vulnerability in the Arm Mali GPU, and show how it can be exploited to gain kernel code execution even when Memory Tagging Extension (MTE) is enabled.

Celebrate #MaintainerMonth with two big opportunities to showcase your open source project at GitHub Universe and WeAreDevelopers World Congress. Applications are open. Don’t miss out!

Road-tripping along the line between engineering and spirituality, Robert M. Pirsig’s musings on the arts, sciences, and Quality ring as true now as they ever have.

Since February, Vercel blocked over 148 billion attacks from 108 million IPs. This roundup highlights improvements to bot protection, DoS mitigation, and firewall tooling to help teams build securely by default.


Cloudflare patched a vulnerability (CVE-2025-4366) in the Pingora OSS framework, which exposed users of the framework and Cloudflare CDN’s free tier to potential request smuggling attacks. After being notified, Cloudflare mitigated the issue within 22 hours.

Clever, clever that Andy Bell. He shares a technique for displaying image alt text when the image fails to load. Well, more precisely, it's a technique to apply styles to the alt when the image doesn't load, offering a nice UI fallback for what would otherwise be a busted-looking error.

A full look at agent mode in GitHub Copilot, including what it can do, when to use it, and best practices.

Meta is partnering with V.tal to extend the Malbec subsea cable to Porto Alegre, Brazil by 2027. With this new extension, Malbec will become the first subsea cable to land in the state of Rio Grande do Sul, bringing more connectivity to millions of people in Southern Brazil and neighboring countries. Malbec will improve the […]


Real-time BGP route visualization is now available on Cloudflare Radar, providing immediate insights into global Internet routing. This new feature, accessible through the updated prefix pages or the API, enables operators to gain a better understanding of prefix routing status in real time.

Plus, ways teammates and leaders can be better mentors for their new counterparts.

In this post, we explore how Instagram has successfully scaled its algorithm to include over 1000 ML models without sacrificing recommendation quality or reliability. We delve into the intricacies of managing such a vast array of models, each with its own performance characteristics and product goals. We share insights and lessons learned along the way—from […]

While there are plenty of ways that CSS animations can bring designs to life, adding simple SMIL (Synchronized Multimedia Integration Language) animations in SVG can help them do much more. Andy Clarke explains where SMIL animations in SVG take over where CSS leaves off.

Vercel Blob is now generally available, providing durable object storage that's integrated with Vercel's application delivery network.


Developers have a gut-felt understanding for performance, but that intuition breaks down when systems reach Cloudflare’s scale. We need the rigor of statisticians to understand latency’s impact on users. Here we discuss our work to communicate customer-centric measurements of latency in our network.