Senior Ai Full Stack Developer

Capitole; Barcelona; Híbrido; EUR 90.000 - 120.000; Jornada completa

Ventajas ofrecidas por este puesto de trabajo

Hybrid model

3 days onsite in Barcelona

Descripción de la vacante

Capitole is seeking a Senior AI Full Stack Developer to join a global team responsible for end-to-end ownership of a worldwide B2B platform. You will design, build, and maintain high-performance web applications with a cloud-native architecture, ensuring reliability, security, and superior user experience.

The role involves developing frontend with React/Next.js, backend with Node.js or Java Spring Boot, deploying cloud-native apps on AWS, and collaborating across international teams in an Agile

Formación

• 5+ years of experience as a Full Stack Software Engineer.
• Strong experience with React and/or Next.js.
• Experience developing backend applications using Node.js and/or Java Spring Boot.
• Strong knowledge of JavaScript, TypeScript, or Java.
• Experience designing and integrating REST APIs.
• Hands-on experience building applications on AWS.
• Experience working with GitHub and CI/CD pipelines.
• Experience implementing unit, integration, UI, and automated testing.
• Experience working in Agile/Scrum environments.
• Fluent English (mandatory).
• Experience integrating LLMs, Generative AI, RAG, or Agentic AI into web applications.
• Experience with data pipelines and AI-enabled backend services.
• Familiarity with AI development tools such as Cursor or Claude.

Responsabilidades

• Design, develop, and maintain enterprise-grade Full Stack applications supporting a global B2B platform.
• Build modern frontend applications using React and Next.js.
• Develop scalable backend services and REST APIs using Node.js and/or Java Spring Boot.
• Build and deploy cloud-native applications using AWS.
• Collaborate with multiple engineering teams working on shared codebases.
• Deliver high-quality software following clean architecture and best practices.
• Optimize application performance, scalability, security, and reliability.
• Implement unit, integration, UI, and automated testing strategies.
• Contribute to CI/CD pipelines and modern DevOps practices.
• Participate in Agile/Scrum ceremonies and cross-functional product teams.
• Collaborate with architects, product managers, UX designers, QA engineers, and international stakeholders.
• Contribute to technical decisions, code reviews, mentoring, and engineering best practices.

Conocimientos

React

Next.js

Node.js

Java Spring Boot

JavaScript

TypeScript

REST APIs

AWS

GitHub

CI/CD

Testing

Agile/Scrum

English

LLMs

Generative AI

RAG

Agentic AI

AI data pipelines

Cursor

Claude

Herramientas

Cursor

Claude

Descripción del empleo

Descripción del trabajo

We are looking for a Senior AI Full Stack Developer to join a global team responsible for the end-to-end ownership of a worldwide B2B platform.

In this role, you will design, build, and maintain high-performance, scalable, and secure web applications that support business-critical digital commerce solutions. You will collaborate with international engineering teams, contributing to a modern cloud-native architecture while ensuring excellent user experience, reliability, compliance, and operational efficiency.

What you'll do

Design, develop, and maintain enterprise-grade Full Stack applications supporting a global B2B platform

Build modern frontend applications using React and Next.js

Develop scalable backend services and REST APIs using Node.js and/or Java Spring Boot

Build and deploy cloud-native applications using AWS

Collaborate with multiple engineering teams working on shared codebases

Deliver high-quality software following clean architecture and software engineering best practices

Optimize application performance, scalability, security, and reliability

Implement unit, integration, UI, and automated testing strategies

Contribute to CI/CD pipelines and modern DevOps practices

Participate in Agile/Scrum ceremonies and cross-functional product teams

Collaborate with architects, product managers, UX designers, QA engineers, and international stakeholders

Contribute to technical decisions, code reviews, mentoring, and engineering best practices

Must Have

5+ years of experience as a Full Stack Software Engineer

Strong experience with React and/or Next.js

Experience developing backend applications using Node.js and/or Java Spring Boot

Strong knowledge of JavaScript , TypeScript , or Java

Experience designing and integrating REST APIs

Hands-on experience building applications on AWS

Experience working with shared repositories using GitHub

Experience with CI/CD pipelines

Experience implementing unit, integration, UI, and automated testing

Experience working in Agile/Scrum environments

Strong software engineering fundamentals, problem-solving skills, and collaborative mindset

Fluent English (mandatory)

Experience integrating LLMs , Generative AI , RAG , or Agentic AI into web applications

Experience with data pipelines and AI-enabled backend services

Familiarity with AI development tools such as Cursor or Claude

What we offer

Hybrid model — 3 days onsite in Barcelona

International environment with global engineering teams