j
jmwallsiii

John Walls

@jmwallsiii

Python Data Automation and Data Cleaning Specialist

United States
English
About me
I’m a CS graduate specializing in Python-based data cleaning, transformation, and automation. I help clients turn messy datasets into clean, usable data and build small ETL-style workflows that save time and reduce errors. My work includes cleaning CSV and Excel files, converting data formats, validating data quality, and loading data into databases. I focus on clear communication, fast turnaround, and delivering solutions that are easy to understand and reuse. If you need help fixing a broken data script, cleaning raw data, or automating a repetitive data task, I’m happy to help.... Read more

Skills

j
jmwallsiii
John Walls
Offline • 

Work experience

Self-Employed

Python Developer

Self-Employed • Freelance

Feb 2025 - Present • 1 yr 5 mos

Built Python scripts to extract and clean business data related to customers, jobs, and invoices. Performed data validation and ETL testing using SQL to ensure accuracy after transformations. Debugged and reviewed scripts to improve reliability and automate repetitive data tasks for a small business.