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Alonso ValdésAV

Alonso Valdés

Data Scientist & Full-Stack Developer - Economist

€380/day
Madrid, ES
8-15 years

Average response time: 1 hour

Freelancer profile translated to English.
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About Alonso

I am an economist and I code.

Eight years doing public finance modeling (pensions, structural balance, fiscal projections), first at the Chilean Budget Directorate (DIPRES) and then in public procurement dashboards in Spain with Dash, FastAPI, and Redis.

Now I am a full-stack and AI developer at DOMA, a SaaS platform that automates the review of municipal records for architecture firms. React, TypeScript, and Supabase in the front; Gemini and Edge Functions for the AI layer (RAG on urban regulations, contextual chat, document ingestion).

What I always end up doing is converting institutional data (budget executions, procurement records, regulatory text) into things that people actually use. Models, dashboards, pipelines, agents.

Stack: Python, SQL, React, TypeScript, Supabase, PostgreSQL, Docker, LLMs (Gemini, OpenAI, Claude). Stata when it's the right tool.
  • Spanish

    Native or bilingual

  • English

    Fluent

  • Portuguese

    Basic

  • French

    Basic

Can work on-site
Madrid (up to 30km)

Experience

  • DOMA
    Full-Stack and AI Developer
    ARCHITECTURE AND URBAN PLANNING
    January 2026 - Today (7 months)
    Spain
    • Developed a SaaS platform for architecture firms that automates the review of municipal records in two phases: document admissibility and regulatory analysis.
    • Implemented the frontend in React, TypeScript, and Supabase with authentication, record management, intelligent document upload, real-time features, admin panel, SII/cadastre maps, and PDF reports.
    • Integrated AI workflows with Gemini and Edge Functions, including contextual chat with SSE streaming, retrieval over urban regulations and private documents, and operational support for the pilot.
    • Technologies: React, TypeScript, Supabase, PostgreSQL, Gemini API, Edge Functions, Cloudflare, Docker, RAG, LLM embeddings.
    Supabase RAG Gemini Vector Embeddings React.js
  • Lentisco
    Data Scientist and Applications Developer
    MEDICAL
    March 2024 - July 2025 (1 year and 4 months)
    Madrid, Spain
    • Development of an interactive web application with Dash and Flask for the visualization of large volumes of data, optimizing browser performance through advanced metadata management.
    • Construction of an ETL pipeline for 1M+ Spanish public procurement records, integrating web scraping from 6 platforms (PLACE, Catalonia, Community of Madrid, Andalusia, Galicia, La Rioja) with coverage from 2017–2025.
    • Optimization of data loading times, achieving a reduction in response times through the implementation of Redis cache. Integration of dynamic filters with modern design, improving user experience in terms of usability and fluidity. Technologies Python, Dash, Flask, Docker, MariaDB, ElasticSearch, FastAPI, Plotly, SQL, Playwright, GitHub, Redis, Pydantic, OpenAI API, Docling, Streamlit, Beautiful Soup, Numpy,
    Pandas, n8n, Supabase, LLM.
    Python OpenAI Webscraping n8n FastAPI
  • Dirección de Presupuestos del Ministerio de Hacienda
    Data Science Analyst | Actuarial Analyst
    PUBLIC SECTOR
    January 2021 - September 2023 (2 years and 8 months)
    Santiago, Santiago Metropolitan Region, Chile
    • Construction of an actuarial microsimulation projecting the Chilean pension system's expenditure until 2100, based on over 80M monthly contribution records (10% sample) from the Pension Data Information System.
    • Developed stochastic projection models to analyze the sustainability of the Pension Reserve Fund using Monte Carlo simulation.
    • Evaluation of the impact of the Employment Protection Law due to COVID-19 using propensity score matching and probit to measure the relationship between employment coverage and pension contributions.
    • Technologies: Python, Stata, Numpy, Pandas, scikit-learn, Matplotlib, Excel VBA, Statsmodels,
    Beautiful Soup.
    Stata Python Pandas Numpy Matplotlib

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Education

  • Master in Data Science, Big Data & Business Analytics
    Complutense University of Madrid
    2024
    Segundo Lugar Premio Beca Pro UCM 2024 — modelo predictivo de precios inmobiliarios con Random Forest, scraping, OpenStreetMap POIs y despliegue en Streamlit + Docker.
  • Master in Economics
    Adolfo Ibáñez University
    2017

Skill set

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