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

Daily rate: 300€/day

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