Summary
Overview
Work History
Education
Skills
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David Jotkus

Chicago,IL

Summary

Data Science student with a focus on analyzing retail and fulfillment data to drive operational enhancements. Experienced in Python, SQL, PySpark, and Databricks, with hands-on work in labor efficiency and store segmentation. Developed real time models based on historical data to support effective fulfillment strategies. Capable of delivering actionable insights in fast-paced eCommerce environments, fostering collaboration within cross-functional teams.

Overview

6
6
years of professional experience

Work History

Fulfillment Strategy & Analytics Intern

Ahold Delhaize USA
Chicago, Illinois
05.2025 - 08.2025
  • Analyzed order fulfillment data using PySpark, SQL, and Databricks to uncover trends for labor efficiency and demand planning.
  • Segmented 2,000+ stores by volume and fulfillment behavior through machine learning techniques.
  • Developed and validated simulation models in AnyLogic with historical order data to optimize dynamic fulfillment strategies.
  • Gained experience working in a fast-paced retail/ eCommerce environment, strengthening collaboration, communication, and strategic thinking skills.

Power BI Intern

READYNETWORKS
Chicago, IL
05.2024 - 08.2024
  • Developed interactive Power BI dashboards utilizing SQL Server data for enhanced visualization of operational metrics.
  • Connected real-time data streams via API to Microsoft SQL Server, facilitating live updates in Power BI reports.
  • Collaborated on ETL pipelines with SSIS, automating data flows from Excel to SQL Server for improved consistency.

Business Operations Assistant

ICE RINK RENTALS AND SALES
Barrington, IL
02.2020 - 08.2022
  • Supported warehouse logistics by assembling and moving portable ice rink panels, managing inventory, and preparing shipments.
  • Contributed to client communications and brand marketing, helped draft social media posts, and participated in discussions with clients during rentals and site visits.
  • Gained practical exposure to small business operations, learning about sales cycles, customer relationship management, and seasonal business planning.

Education

Bachelor of Science - Computational Data Science

The Pennsylvania State University
State College, PA
05-2026

Skills

  • Python
  • Sql
  • R
  • PySpark
  • ETL Processes
  • Databricks
  • Machine Learning
  • Data Analysis

Timeline

Fulfillment Strategy & Analytics Intern

Ahold Delhaize USA
05.2025 - 08.2025

Power BI Intern

READYNETWORKS
05.2024 - 08.2024

Business Operations Assistant

ICE RINK RENTALS AND SALES
02.2020 - 08.2022

Bachelor of Science - Computational Data Science

The Pennsylvania State University

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