A modern web application probably makes tens of network calls during a typical user flow.

A good end-to-end web test must observe and in some cases mock the network calls to make the test reliable, complete, and easy to debug. I will show some of my tips and tricks for using and controlling network API calls during tests. We will see how Cypress, Playwright, and Vitest implement network spies and stubs, and what we can achieve by writing just a little bit of custom code on top of existing features.

Big changes are coming into how things are done in React Native with the library react-native-worklets. It's time to showcase the advantages of concurrent JavaScript and dive deep into its internals and implementation quirks.

A talk on automated testing in React, from Armin's experience

Performance advice tells us to reduce bundle size, minimize re-renders, and optimize everything to the extreme. But do we really need to? Is there anything else we can explore to make our apps look and feel faster—and if we’re lucky, actually be faster?

In this talk, we will review some conventional wisdom and explore techniques beyond it, like different UX strategies, overfetching, and modern Web APIs. We’ll even ask an unexpected question: Can SEO and LSO (LLM Search Optimisation) help with performance?