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.

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
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
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
Hands-on experience building applications on AWS
Experience working with shared repositories using GitHub
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
Hybrid model — 3 days onsite in Barcelona
International environment with global engineering teams
Opportunity to work on a global B2B platform used worldwide

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

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