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Arturo Del ReyAD

Arturo Del Rey

Data Architect

€400/day
Valladolid, ES
8-15 years

Average response time: 1 hour

Freelancer profile translated to English.
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About Arturo

Data Architect with over 8 years of experience designing enterprise data platforms in Python, Databricks, and Snowflake.
What I do:

→ Advanced AI integration into workflows: LLM-assisted development with MCP (Model Context Protocol) architecture to connect language models directly with Databricks, file systems, and real-time APIs. Use of code agents (Claude Code), custom MCP servers for operations on clusters, notebooks, jobs, and SQL warehouses, and automated generation of bundles and technical documentation. This is not basic prompt engineering: it's AI infrastructure integrated into the real development cycle.

→ Design and implementation of production ETL/ELT pipelines: ingestion, transformation, validation, and delivery. I have built medallion architectures (bronze/silver/gold) in Databricks with Unity Catalog, Delta Lake, and automated deployment via GitHub Actions.

→ Enterprise-scale Snowflake Architecture: 4 years building the data infrastructure for Inditex, one of Europe's largest retail groups. Schema modeling, performance optimization, and transformation with DBT.

→ Complete data platforms: currently responsible for a platform with 20+ data projects in production, 75+ automated jobs, and 10 business areas covered, coordinating multiple technology providers. Own frameworks for data governance, quality, and observability.

→ Quantitative analysis: backtesting engines, financial data processing, walk-forward optimization with Optuna, time series over 10+ European markets.
I deliver software that works in production, not presentations. Direct communication, realistic deadlines, maintainable code.

Stack: Python, PySpark, SQL, Databricks (Unity Catalog, Delta Lake, Asset Bundles), Snowflake, DBT, Azure (Data Factory, Data Lake, Functions), Streamlit, Optuna, Git/GitHub Actions, MCP, Claude Code.
  • Spanish

    Native or bilingual

  • English

    Fluent

Remote only
Primarily works remotely

Experience

  • Molins (via SDG Group)
    Data Architect
    January 2026 - Today (6 months)
    • • Designed and built production ETL pipelines on Databricks following medallion architecture (bronze/silver/gold) for the company's enterprise data platform.
    • • Automated CI/CD deployment with GitHub Actions across dozens of dimension and fact tables, creating reusable templates for rapid onboarding of new data bundles.
    • • Data ingestion from SAP, Oracle, and multiple enterprise sources with PySpark transformation logic and quality validation at each layer.
    • • Architecture design and technical leadership for data platform strategy and cloud migration.
  • Inditex (via SDG Group)
    Data Engineer / Specialist
    January 2022 - January 2026 (4 years)
    • • Designed data extraction and transformation pipelines for one of Europe's largest retail groups, handling massive data volumes across multiple business units.
    • • Snowflake architecture design: schema modeling, data warehousing, and query performance optimization at enterprise scale.
    • • Cloud migration to Azure: Data Factory orchestration, Blob Storage, Azure Functions for event-driven processing.
    • • Data transformation pipelines with DBT and Snowflake, ensuring data quality and full traceability.
  • Hotelbeds Group
    Data Engineer
    April 2019 - August 2021 (2 years and 4 months)
    • • Liaison between BI department and business units for migration of data flows and reports to Snowflake and Tableau using agile methodology.
    • • Designed data flows unifying multiple sources; modeled Snowflake schemas and built dashboards for various departments.
    • • Developed new KPIs to improve visibility on company performance across departments.

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Education

  • Master's in Big Data Science
    University of Valladolid (UVa)
    2021
    Master's in Big Data Science
  • Degree in Physics
    University of Valladolid (UVa)
    Degree in Physics

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