Freelancer profile translated to English.
Back to original languageAbout Jose Antonio
Senior Full Stack Engineer | Generative AI Engineer with over 6 years of experience building production SaaS and applied AI systems for businesses.
I help startups and companies integrate artificial intelligence into their products profitably and build scalable web platforms from end to end. I have been a Tech Lead in tech startups and currently develop enterprise applications in the healthcare sector, allowing me to combine startup speed with corporate quality standards.
How can I help you?
Applied AI for Product: Integration of LLMs (OpenAI, Anthropic Claude, Llama), RAG systems with vector databases (pgvector, Pinecone), AI agents, process automation, and prompt engineering. GDPR-compliant implementations.
End-to-end SaaS Development: Next.js, React, TypeScript, Python (FastAPI), Node.js, Supabase, and PostgreSQL. From concept to production deployment with AWS, Docker, Kubernetes, Vercel, or Fly.io.
Architecture and Performance: SSR/ISR, accessibility, technical SEO, microservices, CI/CD, and automated testing.
Technical Leadership: Architecture definition, code review, mentoring, and development team management.
Own projects in production
MeGrowth: AI-powered emotional support platform (RAG, contextual memory, encrypted chat, voice generation).
megrowthes.com
TennisSharp: Real-time sports analytics platform with multi-source data ingestion.
tennisharp.com
Memody: AI study tool that transforms notes into personalized audio content.
memody.app
Spanish
Native or bilingual
English
Fluent
Can work on-site
Barcelona (up to 50km)
Experience
- SanofiFull Stack EngineerJanuary 2026 - Today (7 months)Barcelona, SpainBuilt enterprise healthcare web applications using Next.js, React Developed reusable frontend architecture focused on accessibility, scalability and maintainability. Collaborated with design, data and QA teams to deliver compliant, mobile-first user interfaces. Implemented automated testing and CI/CD workflows to support reliable multi-market releases.
- FreelanceSoftware Engineer & Generative AI ConsultantAugust 2025 - Today (1 year)Barcelona, SpainDesigned and deployed RAG-based knowledge retrieval systems using Python, FastAPI, pgvector and LangChain. Built LLM orchestration layers integrating OpenAI, Anthropic Claude and Llama models for production workflows. Designed AI automation pipelines combining prompt systems, retrieval, tool usage and backend services. Advised clients on AI architecture, vector database selection, embedding strategies and GDPR-aware data flows.
- RecovoTech Lead & Full Stack developerE-COMMERCEOctober 2023 - August 2025 (1 year and 10 months)Barcelona, SpainRecovo is a B2B circular fashion platform connecting brands and producers with textile surplus, driving sustainability in the industry.In my role:Led the development and a team of 3 developers.•Developed and maintained the front-end with Next.js 13-15, TypeScript and Tailwind CSS, creating fast, accessible, and responsive interfaces.•Optimized the platform's architecture and performance, improving load times and user experience.•Collaborated with the product team on the design and implementation of new features (marketplace, dashboards, advanced search).•Integrated APIs and external services (authentication, payments, analytics), following best practices for security and scalability.•Participated in technical definition and deployment in cloud environments (Vercel / AWS).Main Stack: Next.js, React, TypeScript, Tailwind, Node.js, PostgreSQL, AWS.
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Education
- Master Full stack web developmentThree Points2022https://certtun.vottun.com/badgedetail?id=b5477ae3-d2f4-4e7b-b734-92962b8529ab
- Web application developmentJesuites Bellvitge2020