We are looking for a

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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

Opportunity to work on a global B2B platform used worldwide

Why join Capitole?

People-first culture with an inclusive and collaborative environment

Work on enterprise-scale digital commerce solutions with modern technologies

Build cloud-native applications on AWS

Opportunity to contribute to AI-enabled software initiatives

€1,200 annual training budget

Private health insurance

Adaptable compensation plan

Flexible working hours

Wellhub: fitness, wellness, and mental health support

Company-sponsored football and paddle teams

Team buildings, technical communities, and international events

Want to know more about us?

Click here and discover all the details.

Curious about our culture?

Check out what people are saying about us on

Glassdoor .

We know that not every candidate will meet 100% of the requirements. If your experience is close and you're excited about the opportunity, we'd love to hear from you!

Ready for the challenge? Apply now!

Empowering People, Unlocking Innovation.

Information Security Notice The employee will have access to confidential information related to Capitole and the assigned project.

Compliance with internal security and information protection policies is mandatory. xugodme

NDA signature required.

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