Frontend / Backend Developer

European Tech Recruit; Madrid; Híbrido; EUR 40.000 - 60.000; Jornada completa

Descripción de la vacante

A leading tech recruitment firm is seeking a Frontend Engineer in Madrid to build modern web applications. You will work with product specialists to optimize user experiences and integrate APIs while using React or Next.js with TypeScript. Ideal candidates have 1-4 years of experience in frontend development, knowledge of Python, and an understanding of cloud platforms like AWS. This is a fixed-term contract position, requiring 3 days of onsite work per week.

Formación

• 1–4 years of experience building web applications with React or Next.js + TypeScript.
• Knowledge of cloud platforms, preferably AWS.
• Understanding of secure frontend application patterns.

Responsabilidades

• Build scalable web applications using React or Next.js.
• Integrate and consume APIs for efficient data handling.
• Focus on performance optimization and accessibility.

Conocimientos

React

Next.js

TypeScript

Python

AWS

API Integration

UI Development

Herramientas

Redux

Recoil

ECharts

Descripción del empleo

We are seeking a Frontend Engineer to contribute to the development of advanced interfaces that support cutting‑edge AI and data‑driven workflows.

This role is ideal for someone who enjoys transforming complex technical ideas into clean, efficient, and intuitive user experiences. You’ll be working in a fast‑paced environment alongside product specialists, designers, and researchers who rely on your work to visualize and interact with sophisticated backend systems.

Responsibilities

Build modern, scalable web applications using React or Next.js with TypeScript, ensuring clean architecture and maintainable components.

Integrate and consume APIs (REST or GraphQL), ensuring efficient data handling and high‑quality rendering of dynamic information.

Translate early‑stage technical concepts into polished internal tools through quick iteration and user feedback.

Focus on performance optimization, usability, and accessibility to deliver seamless user experiences.

Work with backend engineers on features powered by Python‑based services and cloud‑native infrastructure.

Contribute to deployment workflows supporting AWS and cloud environments.

Qualifications

• 1–4 years of professional experience building web applications with React or Next.js + TypeScript.
• Working knowledge of Python, especially for collaborating on backend features or understanding service interactions.
• Understanding of cloud platforms (preferably AWS) and modern development environments.
• Strong experience with component‑driven UI development, state management (Redux, Recoil, Zustand, etc.), solid experience integrating APIs and handling frontend data workflows.
• Knowledge of data‑visualization frameworks (ECharts, Plotly, Recharts, etc.).
• Understanding of authentication and secure frontend application patterns (OAuth2, JWT).
• Interest in building tools that support machine‑learning, AI, or automation workflows.

Contract Details

Fixed‑term contract

Based in Zaragoza, with 3 days per week onsite