Senior Full Stack Developer – GenAI Platform (Back-end focus)

Project context

Project Details

• Location: Barcelona

• Work mode: Hybrid (1-2 days onsite)

• Start date: ASAP

• Duration: Until end of 2026

• Language(s): English (Mandatory); Spanish or French (Plus)

Project Summary

We are looking for a Senior Full Stack Developer to join our AI products team and contribute to the development of a Multi-cloud GenAI platform (Azure / AWS / Google), with a primary focus on the Secure GPT service. The role is approximately 90% back-end and 10% front-end. The objective is to evolve platform capabilities and ensure secure, scalable, high-quality implementations aligned with business, technical, security, and regulatory requirements.

Goals and deliverables

Main Responsibilities & Key Activities

• Design, develop, and enhance features for the Secure GPT service: document understanding, translation, agentic capabilities, web usage, APIs, and automation

• Execute end-to-end development activities: study, analysis, technical design, implementation, documentation, testing, and monitoring

• Define and track KPIs to monitor usage and support data-informed decisions

• Collaborate within an international team and maintain regular communication with the Tech Lead and Product Owner

• Implement solutions compliant with security, regulatory, and internal standards

• Identify and contribute to improvements in processes, automation, and customer service delivery

Experience Required

Mandatory Experience

• Minimum 5 years of experience in web application development, ideally within Azure environments

• Back-end development with Node.js (JavaScript / TypeScript)

• Front-end development with Next.js / React

• Full ownership of the testing lifecycle: unit tests and end-to-end (E2E) tests

• API design, implementation, and operation

• Azure services: App Services, Cosmos DB, Application Insights, monitoring

• DevOps practices: Azure DevOps, CI/CD pipelines

• Fundamentals of Infrastructure as Code (IaC) and automation scripting

• Prompt engineering: drafting, testing, and iteratively improving prompts

• Experience with AI APIs and/or frameworks: OpenAI, Anthropic, Gemini, Azure AI; RAG and agentic/agent-based capabilities

Preferred Experience

• Terraform and/or Bicep for infrastructure deployment

• Observability and monitoring tooling

• Background in regulated industries

• Azure and API certifications

• Knowledge of data security and compliance

• Availability for occasional travel to France, Spain, or Portugal