Cristhian Castro

Data Scientist with experience in Python, SQL, Data Analysis, Machine Learning, Power BI, among other technologies. I have a background in chemical engineering and quality control that has helped me in the analysis and optimization of processes that occur in the data industry.

I am a highly adaptable individual who feels comfortable in different roles, willing to learn and unlearn. I enjoy working in teams, sharing knowledge, asking for help, and offering support when necessary. I am passionate about constantly learning and always seeking new opportunities to expand my knowledge and skills.

Email: cristhiancastro001@gmail.com / LinkedIn / GitHub

Projects

Sentiment Analysis and Text Classification of Hotels Reviews
September 2023
Skills and Tools:
Natural Language Processing (NLP) · Google Cloud Platform (GCP) · Apache Airflow · Text Classification · Python · Data Science · System Deployment · Data Warehousing · Extract, Transform, Load (ETL) · Data Analytics · Data Engineering · Data Analysis · Microsoft Power BI
Activities:
- Data extraction from Google Maps and Yelp API.
- Data cleansing and warehousing using Google Cloud Platform.
- Use of Power BI and Python visualization libraries to look for insights.
- Development, deployment and demonstration of Machine Learning models and data visualization via Streamlit Apps.
Repository Deployment



Analysis and Visualization of Internet usage in Argentina
August 2023
Skills and Tools:
Data Extraction · Plotly · Matplotlib · Seaborn · Data Visualization · Data Analytics · SQL · Dashboards · Data Analysis · Microsoft Power BI · MySQL
Activities:
- Data extraction, cleansing and transformation from a governmental API using Python libraries like Pandas and requests.
- Exploration, visualization and analysis of the variables of the different tables using Matplotlib, Seaborn and Plotly.
- Building ER model, dashboards, defining metrics and KPI's with Power BI and DAX.
Repository



Content-Based Movie Recommendation System
July 2023
Skills and Tools:
Matplotlib · Seaborn · Python · Data Cleaning · Scikit-Learn · FastAPI · Data Wrangling · Recommender Systems · System Deployment · GitHub · Machine Learning · Pandas (Software) · NumPy
Activities:
- Management and data cleaning of a dataset related to the film industry using Python libraries such as Pandas, NumPy and ast.
- Development of a recommendation model through vectorization, dimension reduction and cosine similarity.
- Deployment of the application with Render and an API built with FastApi.
Repository Deployment

Experience

Expert Rater (Web Search Evaluator)
Mar 2025 - Nov 2025
Responsabilities:
- Analyze and assess advertising content according to established guidelines, providing actionable insights to enhance AI performance and compliance.
- Offer clear, well-structured feedback on content quality, with a focus on improving clarity, relevance, and cultural appropriateness.
- Actively engage in discussions with global teams to reach agreement on content evaluation, fostering teamwork and a collaborative approach.
- Use statistical and quality metrics to track AI performance, identifying areas for improvement and driving changes in line with company standards.
- Maintain up-to-date knowledge of the latest cultural and social trends, as well as guidelines relevant to advertising content.
- Handle sensitive content responsibly. Evaluate queries with sensitivity, ensuring adherence to ethical guidelines and advertising regulations, particularly when dealing with potentially controversial material.

Internet Ads Assessor (Web Search Evaluator)
Feb 2024 - Mar 2025
Responsabilities:
- Reviewing online advertisements in order to improve their content, quality and layout.
- Providing feedback and analysis on advertisements found in search engine results.
- Providing ratings on ads relevance to the search terms used.
- Measuring how appropiate the ads are for the target audience.

Junior Process Engineer
May 2020 - Jun 2020
Responsabilities:
- Supervision of management indicators and KPI's in clarification and evaporation areas.
- Elaboration of process diagrams of the sugar mill.

Private Tutor
Jan 2017 - Sep 2018
Responsabilities:
- Preparation of students who are taking the national scholastic test (Saber 11) in the assignatures of chemistry, mathematics and physics.

Test Item Writer
Oct 2016 - Nov 2016
Responsabilities:
- Building questions that will be used in the national scholastic test (Saber 11) in the topic of Cuantitative Reasoning.

Chemical Engineer Intern
Mar 2015 - Sep 2015
Responsabilities:
- Implementation of Good Manufacturing Practices defined in the colombian resolutions 683 of 2012 and 834 of 2013 for packaging that will be in contact with food.