Jonathan Hartfield

Jonathan Hartfield

Data Scientist & Machine Learning Engineer

Overview

I am a data scientist in the Nashville area, hoping to move to Huntsville, AL. I build practical machine learning systems that improve data quality, speed up decisions, and make analytics easier to trust across teams.

Focused on Azure ML, NLP workflows, and production-ready Python pipelines.

Resume

Skills

  • SQL
  • Python
  • Statistical Analysis
  • Azure
  • Azure ML Studio
  • Machine Learning
  • AI Pipeline Creation
  • NLP
  • DBT SQL
  • Dagster
  • MLflow
  • Linux
  • CRISP-DM

Experience

Data Scientist / Machine Learning Engineer, HCA HealthTrust (Nashville, TN) Jul 2025 – Present

Identified correlations across purchase datasets to predict labels and reduce analyst workload by 50%; leveraged GPU acceleration, NLP, and Azure ML Studio to improve categorization efficiency per line by 5x; implemented Git-based CI/CD workflows for model lifecycle management; and adapted Hugging Face-based LLM techniques to improve unstructured text prediction performance by 5-10%.

Data Quality Analyst II, HealthTrust (Nashville, TN) May 2023 – Jul 2025

Owned end-to-end data quality initiatives and reporting, deployed Python-based machine learning models to support classification and surface data quality concerns, managed ad hoc issues from internal and external stakeholders, delivered regular presentations on quality performance, and maintained classification rules for GL account and financial reporting workflows.

Financial Representative, Northwestern Mutual (Nashville, TN) Dec 2020 – Dec 2022

Built a book of business with 50 clients and 500+ contacts, managed the full client acquisition lifecycle from marketing through sales operations, analyzed client financial data in Excel and related tools, and delivered personalized financial plans including net worth projections, retirement planning, and risk assessments.

Education

Business Analytics, Auburn University (Auburn, AL) Dec 2020

Coursework included corporate finance and capstone work. Received an academic scholarship and leadership recognition in Auburn University Marching Band.

Projects

A selection of public repositories from GitHub.

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Greek Semantic Analysis (Live Demo)

Open in Hugging Face

Interactive app embedded from Hugging Face Spaces.

About Me

I am a Data Scientist with experience leading data quality initiatives and building machine-learning pipelines at HealthTrust. I develop scalable Azure ML models that improve item categorization accuracy and streamline validation workflows. Outside of work, I enjoy spending time with my family, playing music, learning about history, and exploring other technical topics like electronic hardware and home labbing.

Jonathan with his family

Outside of work, I'm a husband and a dad — the best two jobs I've got.