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

11,636 articles
Security — Building a certificate authority for the whole Internet

Building a certificate authority for the whole Internet

Twelve years after launching Universal SSL, Cloudflare is applying to become a certificate authority. By combining an established root, an ACME-first approach, and Merkle Tree Certificates, we are building a post-quantum CA for the open web.

SGSteve Goldsmith·September 29, 2026Security
AI & ML — We tested our own WAF with frontier AI models. Here’s what we found

We tested our own WAF with frontier AI models. Here’s what we found

We built a WAF tester that adapted each request based on what the WAF blocked or passed. This helped us explore variations that a fixed test might miss. We ran it across six attack categories on an authorized staging environment and discovered detection gaps worth fixing. Here’s how the loop worked, what got through, and what we did about it.

VGVikram Grover·September 29, 2026AI & ML
Security — Preventing quantum downgrade attacks against IPsec

Preventing quantum downgrade attacks against IPsec

A sophisticated attacker with a quantum computer can exploit a protocol design flaw to downgrade post-quantum IPsec tunnels to classical crypto. We helped the IETF develop a transcript authentication extension to prevent these attacks.

CPChristopher PattonChristopher Patton·September 29, 2026Security
AI & ML — The road to the agentic browser: A Kitesurf update

The road to the agentic browser: A Kitesurf update

We’ve updated Kitesurf, our Workers-based browser for AI agents, with WebMCP support, improved DOM performance, and terminal-based rendering. With over 730,000 Web Platform subtests passing, agents can now navigate complex sites faster.

CMCelso Martinho·September 28, 2026AI & ML
Engineering — Highlights from Git 2.56

Highlights from Git 2.56

The open source Git project just released Git 2.56. Here is GitHub's look at some of the most interesting features and changes introduced since last time.

ENElijah Newren·September 28, 2026Engineering
AI & ML — Cloudflare’s 2026 Annual Founders’ Letter

Cloudflare’s 2026 Annual Founders’ Letter

The Internet is changing more today than at any point since Cloudflare launched back on September 27, 2010. As automated traffic surpasses human activity, we reflect on the rise of AI agents, new creators, and how we can help build a fair, sustainable future for the web.

MPMatthew PrinceMatthew Prince·September 27, 2026AI & ML