What does it take to turn a from-scratch JavaScript engine into production software?

Johannes will go into detail on spec conformance, CI and benchmarking infrastructure, and how to catch regressions before they happen. There will also be live demos of what you can build when you can shape the entire runtime, plus a closer look at the corners of JavaScript most of us never have to think about.

Johannes has spent his professional career working on JavaScript across web, mobile and backend solutions. With agentic engineering, he has been looking for more complex and sophisticated projects to use AI with.

Modern JavaScript applications rarely fail because of a broken function. They fail at the boundaries: APIs, authentication, feature flags, browser APIs, payments and third-party services.

From a real journey at scale with over 1.3 million transactions, Eduardo will explore an outside-in testing strategy that focuses on what matters most: the interactions between your application and the outside world.

You’ll leave with practical techniques to build confidence, reduce brittle tests and ship changes with greater certainty, regardless of your JavaScript framework.

1771 Technologies is building LyteNyte Grid, a lightning-fast React data grid for complex, high-volume applications.

Lee will give a high-level overview of how LyteNyte Grid achieved best-in-class performance, with a small look at the technical details behind it.

Matias shares some slides from previous talks showcasing what npmx is, and why it exists, as well as the community that's grown around it

James hosts a panel on the future of npmx, taking questions from the audience. The guests from left to right are Willow (GHOST) [@willow.sh], James Garbutt [@43081j], Daniel Roe [@danielroe.dev], Alex [@alexdln.com], and Matias Capeletto [@patak.cat]

In the end, it's all about people, trust, and peers. This talk explores why we trust, how that experience translates for content and how we're improving that experience today.

It doesn't matter whether you're a code artisan or an agent-loop enjoyer; better software specs lead to better codebases, and the strongest specs are those that can be enforced programmatically.

This talk explores property-based testing in TypeScript using fast-check.