Vue FesJapan 2026
The main visual of Vue Fes Japan 2026. It features a silhouette of a V, representing Vue, and a circle, representing the Japanese flag, side by side. The colors are deep matcha-like shades derived from the two colors, and the circle features a Japanese gold marbling pattern.
OtemachiPlace Hall & Conference

Speaker

Cybozu Track
15:50 - 16:20
Marc Backes

The Backend is Reactive: Vue Beyond the Browser

This is a talk that de-mystifies Vue reactivity by implementing it in the browser. Rather than production-ready, we are going to have some FUN WITH CODE.

"What if Vue’s reactivity system didn’t stop at the browser?" In this talk, I’ll turn the entire audience into a synchronized, reactive lightshow—using @vue/reactivity on the backend to orchestrate hundreds of phones in real time.

The key takeaway is that Vue’s reactivity is powerful far beyond the frontend—it can orchestrate backend logic just as effectively as it manages UI state. By treating reactive data as a single source of truth, you can drive multiple clients with minimal glue code. Computed projections make adopting a reactive mindset and helps make side effects, scheduling, and cleanup explicit, predictable, and easier to reason about.

  • Directus
  • Senior Software Engineer

Marc Backes

  • Directus
  • Senior Software Engineer

Marc Backes

The Backend is Reactive: Vue Beyond the Browser

This is a talk that de-mystifies Vue reactivity by implementing it in the browser. Rather than production-ready, we are going to have some FUN WITH CODE.

"What if Vue’s reactivity system didn’t stop at the browser?" In this talk, I’ll turn the entire audience into a synchronized, reactive lightshow—using @vue/reactivity on the backend to orchestrate hundreds of phones in real time.

The key takeaway is that Vue’s reactivity is powerful far beyond the frontend—it can orchestrate backend logic just as effectively as it manages UI state. By treating reactive data as a single source of truth, you can drive multiple clients with minimal glue code. Computed projections make adopting a reactive mindset and helps make side effects, scheduling, and cleanup explicit, predictable, and easier to reason about.