Marta Espinosa
Open to Data Engineering Opportunities
< DATA & PIPELINE ARCHITECTURE >

Hi, I'm Marta Espinosa

I am a Data Engineer

With a Bachelor’s in Biology and a Master’s degree in Data Science, I bridge domain knowledge with robust engineering. I build scalable ETL/ELT data pipelines, optimize database schemas, and deliver clean, reliable data architectures that empower data-driven decision making.

9+

Data Projects

100%

Data Reliability Focus

6+

Core Technologies

Technical Expertise & Stack

Combining scientific rigor with modern data engineering tools to build reliable, high-volume data ecosystems.

Data Pipelines & ETL/ELT

Designing, automating, and monitoring batch and streaming data processing workflows with high reliability.

Python SQL Spark Airflow dbt Web Scraping

Data Warehousing & Modeling

Architecting relational, star-schema, and dimensional data models optimized for fast query performance.

PostgreSQL Snowflake Dimensional Modeling Data Normalization Query Tuning

Analytics Engineering & BI

Transforming complex datasets into executive dashboards, KPIs, and interactive reporting tools.

Power BI Tableau Pandas Seaborn Data Storytelling

End-to-End Data Pipeline Lifecycle

How I design and structure scalable data operations from raw source ingestion to final business intelligence.

STAGE 01

Ingestion

APIs, Web Scrapers, Relational DBs & External Flat Files (CSV, Parquet, JSON)

STAGE 02

Transformation

Data cleaning, schema alignment, data quality checks & enrichment via Python & SQL

STAGE 03

Storage & Modeling

Relational Databases, Data Warehouses & Star-Schema Dimensional Models

STAGE 04

Delivery & BI

Interactive Power BI Dashboards, Executive Reports & Downstream Analytics

Projects & Case Studies

Explore selected data engineering pipelines, AI RAG systems, database optimization, and BI analytics.

AI Talent Intelligence System Architecture
AI & RAG Multi-Agent

AI Talent Intelligence System

Enterprise-grade multi-agent RAG platform combining vector retrieval, persistent memory, and LLM orchestration (GPT-4o-mini) to automate candidate CV parsing, evaluation, and question generation.

AI / RAG Multi-Agent FastAPI Streamlit Python
Deforestation exploration
SQL & Data Modeling

Deforestation Exploration

SQL data analysis evaluating country-level deforestation data globally. Structured relational queries to uncover environmental impacts and area loss trends over time.

SQL Data Analysis Environment
Udiddit Social News Aggregator
Relational Database Engineering

Udiddit: Social News Aggregator

Re-engineered and normalized an inefficient database schema for a social news platform. Fixed data integrity issues, implemented constraints, and added user web analytics using SQL.

PostgreSQL Schema Design Data Normalization
Movies Correlation Project
Python & Data Pipeline

Movies Revenue Correlation Analysis

Data extraction and correlation analysis pipeline examining variables affecting movie box-office revenue using Python, Pandas, NumPy, and Seaborn heatmaps.

Python Pandas Seaborn Jupyter
Seven Sages Brewing Company
Power BI & Financial Modeling

Brewing Company Profitability Model

Comprehensive financial data model and interactive Power BI report for Seven Sages Brewing Company. Enables executive leadership to analyze beer margins and product profitability.

Power BI DAX Financial Modeling
Covid project
Data Pipeline & Analysis

Covid-19 Global Data Pipeline

Data cleaning and transformation pipeline analyzing global infection and mortality trends across countries and continents using Python, NumPy, Pandas, and Matplotlib.

Python Pandas Matplotlib
Waggle Pet Device Report
Power BI Product Analytics

Waggle Smart Pet Device Analytics

Product intelligence dashboard comparing device adoption and telemetry metrics between dog and cat smart collar lines for startup commercial strategy.

Power BI Product Analytics User Telemetry
Market Analysis Report
Customer Intelligence

Retail Market & Customer Analytics

Targeted marketing analytics and segmentation report for an e-commerce apparel company, guiding advertising spend toward high-ROI product categories.

Power BI Market Segmentation ROI Analytics
Amazon Web Scraper
Web Scraping & Automation

Amazon Automated Price Monitoring Scraper

Automated Python web scraper built with BeautifulSoup that monitors product availability, logs price fluctuations into CSV storage, and alerts on price drops.

Python BeautifulSoup Automation CSV Pipeline

Let's build something scalable together

Whether you have a data engineering role, a pipeline project, or a database query optimization task in mind, feel free to reach out!

Curriculum Vitae Download CV (PDF)