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 integral 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
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
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

📌 Senior AI Full Stack Developer (Madrid)
🏢 Capitole
📍 Madrid