Senior AI Full Stack Developer

Capitole; Barcelona; Híbrido; EUR 85.000 - 115.000; Jornada completa

Ventajas ofrecidas por este puesto de trabajo

Hybrid model Barcelona

€1,200 annual training budget

Wellbeing program

Sports teams

Team events

Descripción de la vacante

Capitole is seeking a Senior AI Full Stack Developer to join a global team responsible for the end‑to‑end ownership of a worldwide B2B platform. You will design, build, and maintain high‑performance web applications that power digital commerce solutions, collaborating with international engineering teams in a cloud‑native architecture.

The role focuses on frontend with React/Next.js and backend with Node.js or Java Spring Boot, AWS deployment, REST APIs, and AI integrations.

Formación

• 5+ years of experience as a Full Stack Software Engineer.
• Strong experience with React and Next.js.
• Backend development with Node.js and/or Java Spring Boot.
• Experience designing REST APIs and AWS cloud deployments.
• Experience integrating AI capabilities (LLMs, Generative AI).

Responsabilidades

• Design, build, and maintain enterprise-grade full-stack web apps.
• Develop frontend with React/Next.js and backend with Node.js or Spring Boot.
• Collaborate with international teams and integrate AI features.
• Contribute to CI/CD pipelines and DevOps practices.
• Ensure security, performance, and reliability of platforms.

Conocimientos

React

Next.js

Node.js

Java Spring Boot

REST APIs

AWS

GitHub

CI/CD

Agile/Scrum

AI/LLMs integration

RAG/Agentic AI

Data pipelines

Herramientas

Cursor

Claude

Descripción del empleo

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
• 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 fundamentals, problem‑solving skills, and collaborative mindset
• 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
• 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
• Wellhub: fitness, wellness, and mental health support
• Company-sponsored football and paddle teams
• Team buildings, technical communities, and international events

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!

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.