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 general 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 Flexible 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. NDA signature required.

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