Senior Frontend Engineer (Next.js / React)

Colossyan; Barcelona; A distancia; EUR 50.000 - 70.000; Jornada completa

Descripción de la vacante

A dynamic AI-focused company is seeking a Senior Frontend Engineer to create high-quality applications using Next.js and React. Ideal candidates will have over 8 years of frontend experience and a strong emphasis on accessibility. This position allows for remote work, with a preference for those located in Barcelona or Amsterdam. Enjoy a competitive salary and various benefits including flexible time off.

Servicios

Flexible time off

Home-office budget

Learning stipend

Formación

• 8+ years building production frontends.
• Deep Next.js knowledge and strong React skills.
• Mastery of the browser runtime and streaming techniques.
• Proven track record shipping accessible UI.

Responsabilidades

• Ship high-quality frontend apps with Next.js, React, and TypeScript.
• Translate Figma designs into responsive, accessible UI.
• Champion accessibility across components.
• Optimize performance and manage app deployment.

Conocimientos

Next.js

React

TypeScript

Accessibility (WCAG 2.2 AA)

English (professional fluency)

Herramientas

Vercel

Web Vitals

Lighthouse

Descripción del empleo

About LearnWise AI

We’re an AI-first scale up helping universities and colleges support students and faculty with smart, knowledge-driven tools from AI tutoring to feedback and support. Small team, high ownership, real user impact.

Why this role exists

We need a senior who can take product ideas from Figma to fast, accessible, production apps on Vercel - and lead the craft on performance, and accessibility.

What you will do

• Ship high-quality frontend apps in Next.js, React and TypeScript (App Router & Page Router, SSR/SSG/ISR, middleware, edge patterns).
• Translate Figma designs into responsive, accessible UI; iterate quickly with design & product.
• Champion accessibility to WCAG 2.2 AA across components and flows.
• Own performance: optimize data loading/streaming, reduce bundle size, profile the JS event loop and async flows.
• Keep dependencies lean and healthy; document decisions; raise the bar through reviews.
• Deploy, preview, and monitor apps on Vercel (analytics, error tracking, observability).

You will do great here if you have

• 8+ years building production frontends.
• Deep Next.js knowledge (App vs Page routes) and strong React + modern TypeScript/JavaScript fundamentals.
• Mastery of the browser runtime: event loop, promises, concurrency, streaming.
• Proven track record shipping accessible UI to WCAG 2.2 AA.
• Professional fluency in English (written & spoken).
• Bias to action, comfort with ambiguity, and love for startup pace.

Nice to have

• Built streaming UIs, chat experiences, or AI-powered apps (real-time, RAG, agents).
• Experience with design systems, motion/interaction details, and component libraries.
• Tooling for performance & observability (Web Vitals, Lighthouse, bundle analysis).

How we work

• Default to open: write things down, share context early.
• Small team, big ownership: you’ll own projects end-to-end.
• Measure > guess: we ship, we instrument, we learn.
• Quality and speed: we don’t choose—we engineer for both.

Location

• Remote is OK; EU is a must-have.
• Prefer Barcelona, Spain or Amsterdam, Netherlands if you want hybrid/office.

Compensation

• Salary: competitive (location-adjusted).
• Flexible time off, home-office budget, and learning stipend.

If you are passionate about creating intuitive, engaging user interfaces, interested in working for a startup, and excited about the opportunity to work on innovative AI projects that make an impact for students just like you, we would love to hear from you!

To fast-track your application, please visit https://join.learnwise.ai/Senior-Frontend-Engineer-Next-js-React-2856fdcbf21080dabcd1f74db161f635 and complete the form on this page.