07/16/2026 updated

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Data Scientist & Machine Learning Engineer

Padova, Italy
Worldwide
Master's Degree in Physics of Data (in progress), University of Padua
Padova, Italy
Worldwide
Master's Degree in Physics of Data (in progress), University of Padua

Profile attachments

CV_Andres_Rojas_eng_26.pdf

Data AnalysisData MiningMachine LearningNatural Language ProcessingData ScienceDeep LearningMachine Learning Operations
Machine Learning & Deep Learning
Expertise in developing and evaluating machine learning and deep learning models using frameworks such as PyTorch, TensorFlow, and Scikit-learn, applied to tasks including fraud detection, text classification, and sentiment analysis.

Natural Language Processing (NLP)
Proficiency in NLP pipelines for text classification, sentiment extraction, and information retrieval, including implementation of Retrieval-Augmented Generation (RAG) systems and transformer-based architectures.

Data Analysis & Statistical Modeling
Strong foundation in statistical methods, probability, and optimization, with hands-on experience processing and analyzing large-scale structured datasets using Python and SQL to generate actionable insights.

Computer Vision
Experience building computer vision systems integrating LLM workflows for character recognition and large-scale document comparison.

Programming Languages
Proficiency in Python, C++, SQL, R, and Bash for data processing, modeling, and automation tasks.

Mathematics & Monte Carlo Methods
Solid background in mathematics including statistics, probability, optimization, and Monte Carlo simulation methods applied to real-world problems.

Data Engineering & Pipelines
Experience building data pipelines for cleaning, transformation, and reporting, as well as automated data collection pipelines from multiple web sources.

Tools & Development Environment
Familiarity with Git, Linux, Jupyter Notebooks, and LaTeX for version control, development, and documentation.

Generative AI & RAG Systems
Knowledge and practical experience with Retrieval-Augmented Generation (RAG) systems and generative AI methods, including contributions to the TREC-RAG 2024 initiative.

Experience

Professional experience0 - 5 years
Freelancer since2026

Languages

EnglishFluentItalianGoodSpanishNative speaker

Project history

Project

Selected Project - Sentiment Analysis for Security Perception Estimation
Developed deep learning models to infer public perception from text data. Applied NLP pipelines for classification and sentiment extraction.

Project

Selected Project - Job Market Intelligence via Web Scraping
Built automated data collection pipelines from multiple web sources. Structured datasets for downstream analytics and trend analysis.

Machine Learning Analyst

Consejo Nacional Electoral (CNE)
Developed and evaluated fraud detection models using supervised learning and Monte Carlo simulation methods. Built computer vision systems implementing workflow with LLM for character recognition and large-scale document comparison. Analyzed structured datasets to support evidence based operational decisions.

Data Scientist / Analyst

Colombia Compra Eficiente - Colombian Government
Developed a recursive neural network classification model for procurement process categorization with over 5 million register dataset achieving an F1 score of 89. Processed and analyzed large public-sector datasets using Python and SQL. Built data pipelines for cleaning, transformation, and reporting insights about procurement behavior. Generated analytical insights for policy and operational decisions.

Research Intern, Electrical & Computer Engineering

University of Delaware
Developed scalable pipelines for large-scale text processing and retrieval tasks. Implemented Retrieval-Augmented Generation (RAG) systems for information access problems. Contributed to experimentation and benchmarking in the TREC-RAG 2024 initiative. Collaborated with researchers in an international academic environment.

Research Intern, Data Science & Optimization Group

Tecnologico de Monterrey
Designed and trained deep learning models for sentiment analysis. Compared neural networks and transformer-based architectures on NLP tasks. Built end-to-end workflows for preprocessing, modeling, and evaluation. Extracted insights from multi-source data related to urban security perception.

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