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Guillermo SantiagoGS

Guillermo Santiago

Senior Data Consultant

€500/day
Barcelona, ES
3-7 years
Python
SQL
Data Engineer
Data science
ETL

Average response time: 1 hour

Freelancer profile translated to English.
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About Guillermo

I help companies transform data into value through scalable architectures, robust pipelines, and business-oriented analytical models. Tailored to client needs.

I have worked in complex environments, collaborating with multidisciplinary teams to solve real problems through data. I have experience across the entire lifecycle: ingestion, transformation, modeling, and visualization.

Specialties:
- Data architectures (Data Warehouse, Data Lake, Lakehouse)
- ETL/ELT pipeline development
- Data modeling and performance optimization
- Source integration (APIs, databases, streaming)
- Data quality and governance

Usual stack:
Python, SQL, Spark, Airflow, dbt, and cloud environments (AWS, GCP, Azure), along with visualization tools like Power BI.

Analytical, results-oriented profile focused on building efficient, scalable, and maintainable solutions. I seek to add value in projects where data is key for decision-making.
Agriculture and Forestry
Pharmaceuticals

  • Catalan

    Native or bilingual

  • English

    Fluent

  • Spanish

    Native or bilingual

Can work on-site
Barcelona (up to 50km)

Experience

  • RSM Spain Consultores SL
    Data Consultant & Data Engineer
    January 2021 - January 2025 (4 years)
    • Responsible for the design, planning, and implementation of technical solutions in ERP implementation projects.
    • Knowledge hub and support for the internal team, as well as clients from different industries.
    • Team management in projects with 5 to 10 people.
    • Direction of data analysis projects with integrations between different software and technologies with Power BI.
    Netsuite Agile method Tech Lead PMO
  • AtelierH Group (AtelierH)
    Co-founder, General Manager & Head of Technology
    January 2024 - January 2025 (1 year)
    • Responsible for the digital area, in charge of technological decisions and digital support for all team members.
    • Operations leader in the day-to-day of a team of 10 to 15 people focused on company growth.
    • Software development for commercialization and improvement in activity efficiency, with technologies such as SQL, AWS, MongoDB, among others.
    • Design and definition of the processes to be implemented by the entire team as well as the business plan.
    Strategic planning Technical project management Business development Corporate strategy Business intelligence
  • Propelling Tech (Propelling Tech)
    Senior Data Consultant
    January 2025 - Today (1 year and 7 months)
    • Responsible for the design and data modeling and the accompanying ETLs.
    • Responsible for the architecture of the different BI applications.
    • Liaison with the different project stakeholders.
    Data Engineer Data analysis Databricks Microsoft Power BI Data visualization

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Education

  • Degree in Engineering of Technologies and Services
    Escuela Técnica Superior de Ingeniería de Telecomunicación de Barcelona (ETSETB)
    2022
    en Ingeniería de Tecnologías y Servicios de
  • Technology for Social Innovation
    Escuela Superior de Administración y Dirección de Empresas (ESADE)
    2021
    Technology for Social Innovation
Check out Guillermo's education

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