We are looking for a Senior Full-Stack / GenAI Engineer to join an international AI Products team working on the evolution of a secure, enterprise-grade GPT platform. You will contribute mainly to back-end development (around 90%), with occasional front-end contributions, building secure and scalable features for document understanding, translation, APIs, automation, web usage and agentic capabilities. What you will do * Design, build, test and monitor end-to-end product features. * Develop and enhance back-end services using Node.js and TypeScript. * Contribute to front-end development with Next.js and React. * Design, implement and operate APIs. * Work with Azure App Services, Cosmos DB, Application Insights and monitoring tools. * Define usage KPIs and support dashboards, reports or metrics. * Build automated workflows and operational scripts. * Ensure solutions comply with security, regulatory and internal standards. * Collaborate closely with the Tech Lead, Product Owner and international stakeholders.



What we are looking for * At least 5 years of web application development experience, ideally in Azure environments. * Strong hands-on experience with JavaScript / TypeScript and Node.js. * Experience with Next.js and/or React. * Solid experience with APIs, Azure DevOps and CI/CD pipelines. * Experience owning the full testing lifecycle, including unit and E2E testing. * Hands-on knowledge of Azure App Services, Cosmos DB, Application Insights and monitoring. * Experience with AI APIs or frameworks such as OpenAI, Anthropic, Gemini or Azure AI. * Knowledge of RAG and agentic / agent-based capabilities. * Strong prompt engineering skills. * Fluent English communication skills (B2+). Experience with Terraform, Bicep, observability tooling, regulated industries, security and compliance will be valued.

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Barcelona-based role. Two onsite days per we

📌 Senior Full-Stack (Madrid)
🏢 JobFlurry
📍 Madrid