ReactJS Barcelona - April 2026

April Meetup is here! Let's gooo! We have some amazing speakers, and of course pizza and drinks will be available after the event.
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18:30: Welcome
Grab a drink, and a seat until everybody arrives!

18:45 Intro by Host Neciu Dan

19:00 Type safety across the network chasm
Speaker: Alexander Vechi, Product Engineer at SkyScanner

Type safety often stops at the network boundary. In this talk, Alex will look at how modern frameworks try to bridge that gap, and share lessons from Skyscanner’s setup with protobuf-generated TypeScript types, including versioning, nullability, and validation to make API contracts safer in real frontend code.

19:25 Building a Workflow Builder From The Ground Up
Speaker: Martí Serra Molina Frontend Engineer | Creator of Formity

Workflow builders are powerful tools for visually designing and automating complex processes, but building one from scratch in React poses unique challenges. Most teams reach for React Flow to handle node-based diagram rendering, yet there is still significant logic to build on top of it — a node layout algorithm, workflow state modeling, drag-and-drop, undo and redo, and more. In this talk, you will learn how to build a workflow builder from the ground up and the real-world complexities that emerge along the way.

19:50: Drinks and networking!
Do you want to talk at this meetup? Reach out to Dan Neciu on LinkedIn

And please help us spread the news and grow the community:

20:55 Meetup finished

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Sponsors:

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