We are looking for a Senior AI Full Stack Developer to join a general 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

📌 Senior Ai Full Stack Developer (España)
🏢 Capitole
📍 España