Name: ReactJS Barcelona - June
Start: 2025-06-10T19:00:00+02:00
End: 2025-06-10T21:00:00+02:00
Location: CareerOS

June Meetup is here! Let's gooo ! We have some amazing speakers, and pizza and beer will be available after the event.
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**19:00: Welcome**
Grab a beer, a snack, and a seat until everybody arrives!

**19:30: Re-thinking Next.js: Why We Picked Astro for Kleinanzeigen's High-Traffic Frontend**
Speaker: [Danilo Velasquez ](https://www.linkedin.com/in/danilovelasquez/)Staff Software Engineer @ Adevinta

Is Next.js always the answer for large React-ecosystem projects? This talk presents Kleinanzeigen's real-world experience and the technical reasons we chose Astro to address critical issues related to performance, self-hosting, and developer velocity that we faced or anticipated with a large-scale Next.js setup.

**20:00: Mapping the Future: Building Interactive Dashboards with Mapbox/MapLibre and Vector Tiles in React**
Speakers: [Rashan Smith](https://www.linkedin.com/in/ACoAAAqatGoB6_K6hXBtAAkO6S3s2rZBPIQktAU) Software Engineer @ UNICEF and [Utku Can Ozturk](https://www.linkedin.com/in/utkucanozturk/overlay/about-this-profile/) Data Scientist @ UNICEF

Join us for a 30-minute deep dive into the powerful world of interactive mapping in React.

First, a React developer will walk you through using Mapbox and its open-source counterpart MapLibre within a React application. You’ll learn how to integrate these libraries, build performant and interactive map-based dashboards, and explore tips for handling dynamic data, custom layers, and user interactions in a modern React environment.

The second half will feature a data scientist who will demystify the process behind the maps. They’ll explain how vector tiles are generated, optimized, and served and walk through real-world examples of geospatial data processing pipelines. You’ll gain a clear understanding of how the backend work empowers your front-end visualizations.

**20:30: Drinks and networking!**
Do you want to talk at this meetup? Reach out to Dan Neciu [on LinkedIn](https://www.linkedin.com/in/neciudan/)

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

[Twitter(X)](https://x.com/ReactJsBCN)
[BlueSky](https://bsky.app/profile/reactbarcelona.bsky.social)
[LinkedIn](https://www.linkedin.com/company/reactjs-barcelona/)
[Instagram](https://www.instagram.com/reactjs_barcelona/)

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**Sponsors:**
**[CareerOS](https://www.careeros.com/)**
At CareerOS, we believe that success goes beyond the basics—securing your ideal position requires building a strong network, connecting with advocates, and staying organized at every step.

That’s why we created CareerOS: a one-stop platform designed to help students and professionals advance their careers by strategically networking, connecting with key decision-makers, and streamlining every aspect of their job search. Founded in 2023, we’ve grown rapidly into a diverse team of 25+ professionals representing over 10 nationalities, headquartered in the vibrant city of Barcelona, Spain.

With partnerships spanning 40+ universities worldwide, we’re here to help students and professionals move past the job search grind and take confident strides toward a career they're truly passionate about.

Dan Neciu

ReactJS Barcelona

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