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Rafael Sosa RamírezRR
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Rafael Sosa Ramírez

@rafaelsosaramrez

I build production NLP, semantic search, and generative AI systems from large-scale data.

Spain
Message

At UOC’s Skills Intelligence Unit, I build large-scale NLP and machine learning pipelines across 10M+ job postings and occupational datasets, extracting and normalizing skills, occupations, and labor-market entities. I develop embedding-based semantic search and RAG systems using BERT and MPNet, alongside LLM pipelines for structured extraction and synthetic-data generation.

I’ve also delivered ETL pipelines, customer-segmentation models, KPI reporting, and analytical tools for Aspasia, Mainjobs, Adecco, Universidad Pablo de Olavide, and ASPAYM Sevilla. My PhD research combined web scraping, topic modeling, clustering, and sentiment-analysis benchmarking, and my applied NLP work includes peer-reviewed research on synthetic data generation.

Experience

Work history, roles, and key accomplishments

UO
Current

Data Scientist & AI Researcher

UOC

Jan 2026 - Present (7 months)

Develops large-scale NLP and ML pipelines processing 10M+ job postings and occupational data, including scraping, normalization, and analysis. Builds embedding-based semantic search and RAG systems, and develops LLM-based pipelines for structured extraction and synthetic data generation.

Education

Degrees, certifications, and relevant coursework

Universidad Pablo de Olavide logoUO

Universidad Pablo de Olavide

Doctor of Philosophy, Social Sciences

PhD in Social Sciences with a thesis on web scraping, NLP topic modeling, clustering, and sentiment analysis.

Google logoGO

Google

Certificate, Data Analytics

Advanced Data Analytics Certificate from Google.

IBM logoIB

IBM

Certificate, Data Science

Python for Data Science certificate from IBM.

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