ReactJS Barcelona

ReactJS Barcelona - February 2026

Wed, Feb 25 · 6:30 PM CET

Perk office, 160 Carrer dels Almogàvers, Barcelona, ES

You thought we would skip February? NO! We're back, baby! February 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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18:30: Welcome
Grab a beer, a snack, and a seat until everybody arrives!

18:45 Intro by Host Neciu Dan and Giorgio Polvara from Perk

19:00 The 2600€ Mistake: How we saved 90% on Cloud Costs by breaking the SSR Myth
Speaker: Danilo Velasquez, Staff Web Platform Engineer and Consultant

When our Astro/React migration reached 8,000 RPS, 100 pods couldn't prevent the crash loops. Discover how mastering Node.js internals—Cluster API, file descriptors, and strict timeouts—slashed our bill from 2,850€ to 250€ while handling 1.6B monthly views. A war story about why "frontend-only" thinking fails on the server.

19:30 400 Tech Leads. Same problems. None of them technical.
Speaker: Anemari Fiser, O’Reilly Author | Engineering Leader

After training and coaching more than 400 tech leads across companies and industries, one pattern keeps repeating: when tech leads struggle, it’s rarely a technical gap.

In this talk, Anemari Fiser shares the most common challenges tech leads bring into coaching sessions - overload, unclear expectations, ownership confusion - and assumed alignment, and why “getting better technically” almost never fixes them.
Drawing from real coaching and training examples, the talk explores where tech leads get stuck, what they think the problem is, and the small but meaningful shifts that help them move forward.

19:45: 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:

20:45 Meetup finished

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Sponsors:
Perk

The intelligent platform for travel and spend. Time-consuming bookings, endless approvals, hundreds of receipts: Perk is designed to eliminate the work behind the work that is costing your business trillions and draining your teams' morale and productivity. At Perk, we call it shadow work. By automating bookings, expenses, and invoice processing, Perk takes care of shadow work so your teams can get down to business—all while keeping you in control.

Founded in 2015, we’re trusted to power real work for over 10,000 companies worldwide, including Wise, On Running, and Breitling, and are backed by first-class investors such as SoftBank, Kinnevik, Felix Capital, Target Global, LocalGlobe, Spark Capital, and Noteous Partners. Work with Perk, and unlock the full potential of your people and your business.
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ReactJS Barcelona - March 2026

Tue, Mar 3 · 6:00 PM CET

Itnig Café, Carrer de Pujades 100, Barcelona, ES

Revolut & ReactJS Barcelona meet-up

Our next edition of the meet-up comes with an exciting collaboration with Revolut’s tech team.

We’re gathering at Itnig to go beyond the basics — breaking down the architecture behind a global fintech leader, exploring how we scale and secure our infrastructure.

❗Important: for this particular event, only those who have submitted the registration form will be considered for an invitation. For security purposes, only invited guests on the list will be granted access to the premises.

🎟️ Limited spots available. Register here: https://revolut.la/4qoKnkL

What’s on the agenda?
18:00–18:30 | Doors open
18:30–18:45 | Welcome and event kickoff
18:45–19:25 | “Building Revolut ATM” by Eugene Opryshko
19:25–19:55 | “Runtime Contract Validation with Zod: closing the TypeScript gap” by Jasja Prick
19:55–20:35 | “The Type-First Ecosystem: engineering for safety and scale” by Max Tarsis
20:35–21:30 | Networking and snacks
21:30 | Doors close

If you’re interested in frontend architecture, type safety, and engineering at scale, come for the tech and stay for the networking.

📍 Where: Itnig, Barcelona
🕕 When: 3 March | 18:00
🎟️ Limited spots available. Register here: https://revolut.la/4qoKnkL

❗Important: for this particular event, only those who have submitted the registration form will be considered for an invitation. For security purposes, only invited guests on the list will be granted access to the premises.