Who we are:
Marfeel is a publishing intelligence platform trusted by over 5,000 publishers worldwide: including Business Insider, Le Figaro, El País and McClatchy. We help publishers turn data into action: understanding what content is working right now, what has performed over time, and what to do next. Our platform gives editorial, SEO, audience, and revenue teams a unified view of their business, spanning real-time dashboards and deep historical analysis, all in one place.

Our international team is made up of over 15 different nationalities, with headquarters in Barcelona. Our people and our diversity are at the heart of what we build, and we are still growing.

The role:

We are looking for a Frontend Engineer with a strong foundation in JavaScript and a sharp eye for performance. You will build the interfaces that bring our analytics platform to life: writing clean, performant JavaScript from first principles and creating interactive components for publishers around the world. You use AI coding tools as a core part of how you work, and you are excited about what that unlocks.



You will work in a collaborative team environment alongside backend developers, UX designers and product managers, and you will have real ownership over the frontend code you write.

This is what you will do:

-
Write clean, well-structured JavaScript and CSS across all modern browsers

-
Write vanilla JavaScript where appropriate: you reach for the framework when it adds value, not by default

-
Build interactive, high-performance UI components using React and TypeScript

-
Create and maintain a component library using Storybook and styled-components

-
Collaborate with UX designers to implement pixel-accurate, intuitive interfaces

-
Work on performance: scroll, rendering, load times and jank are things you care about

-
Contribute to frontend architecture decisions and coding standards

-
Work in an Agile environment with short, focused sprints

This is you:

-
5+ years of experience

📌 Frontend Engineer (Barcelona)
🏢 Marfeel
📍 Barcelona