Matthew Melendez

Matthew Melendez

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Data Scientist
Texas, United States

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Jobs verified_user 0% verified
  • Sysco
    Data Scientist
    Sysco
    Jul 2022 - Jan 2025 (2 years 7 months)
    Expanded multiple projects to our Canadian Stakeholders including Customers Segmentation Score, which provides our Sales Team a score to track over time and notify them how and when to focus on a customer based on their transactional behavior and customer information. Additionally expanded our Bid Automation project to our Canadian Contract Customers, where an XGBRegressor was used to determine which item categories have the higher chances of customers purchasing. Refactored existing projects in PyCharm to easier include additional LOBs and follow our team’s Coding Standards for production-level code, which entailed testing on EC2 instances and version controlling on GitHub. Led training sessions for the Data Science Team.
  • Sysco
    Associate Data Scientist
    Sysco
    Nov 2021 - Jul 2022 (9 months)
    Collaborated with SMEs to enhance the Universal Unit of Measurement code to intake raw vendor item data and convert size information to align within item categories. This allowed us to compare similar item’s prices to stay competitive and display this information to our customers for an easier shopping experience. Worked across multiple departments to create business rules to improve Item Slotting and upload data to S3 Buckets. Wrote SQL Queries an implemented XGBClassifier for a Customer Archetype project to define different types of customers based on their properties combined with their transactional history. Analyzed transactional data after an item was given an image for the customer’s visibility and analyzed surveys for the sales t
  • Kaiser Permanente
    Data Scientist
    Kaiser Permanente
    May 2020 - Dec 2020 (8 months)
    Machine learning: Implemented an XGBClassifier algorithm with GridSearchCV, Shap feature selection, and EarlyStopping to predict patients who are not adherent to their prescribed medication. Once patients were identified we were able provide them resources designed to improve their health. Data analysis: Calculated Social Health Index score using gradient boosting and random forest regression. As a result, Kaiser is able to give patients support that can improve their access to healthcare. Data architecting: Created and populated Feature Store PostgreSQL tables. Implemented data ingestion through a flask app. Ensured quality through unit testing and data quality tests using BlueMix and GitHub. Architecture Diagrams were created for migratio
  • Texas Christian University
    Graduate Research Assistant
    Texas Christian University
    May 2017 - Jun 2019 (2 years 2 months)
    Masters Thesis: Using The Cannon to study the chemistry of the Sagittarius Dwarf Galaxy Machine learning: Leveraged The Cannon, a data-driven machine learning algorithm built for astrophysics research, to determine accurate parameters from stellar spectra. Data Analysis: Used Python packages such as NumPy, Pandas, Scipy, and Matplotlib to manipulate the data and analyze trends in the stellar parameters across the face of the galaxy. The code was developed in Jupyter Notebooks and hosted/version controlled on GitHub. Results were presented to both technical and non-technical audiences.
Education verified_user 0% verified
  • Texas Christian University
    Master of Science - MS, Physics
    Texas Christian University
    Aug 2015 - May 2019 (3 years 10 months)
    In addition to completing required coursework I did my thesis in Astronomy where I analyzed stellar light curves and identified two newly found RR Lyrae stars. I also used Runge-Kutta method in Python to model these light curves to better understand the physics of the variable stars.
  • The University of Dallas
    Bachelor of Science - BS, Physics
    The University of Dallas
    Aug 2010 - May 2014 (3 years 10 months)
    In addition to completing required coursework I did my thesis in Astronomy where I analyzed stellar light curves and identified two newly found RR Lyrae stars. I also used Runge-Kutta method in Python to model these light curves to better understand the physics of the variable stars.
Awards verified_user 0% verified
  • Boy Scouts of America
    Eagle Scout
    Boy Scouts of America
    Aug 2008