Cal Roff
(He/Him)
Data Analyst

Contact Information

Education

  • 2020 - 2022

    MSc, Statistics

    University of New South Wales

  • 2017 - 2020

    BSc, Mathematics

    University of New England

Summary

Data Analyst with 3+ years experience in the retail sector with a strong math background and passion for problem solving. Committed to helping organisations deliver measurable value and reach new heights by identifying key patterns in big, complex data.

Experience

Jul 2023 - Present
Kmart Group, AU

Operations Data Analyst

  • Developed algorithms to measure and pin-point root casues for low inventory accuracy using RFID data. These proved to be important features in an ML model aimed to facilitate accurate inventory adjustments, resulting in a 5% uplift in inventory accuracy and +$24M incremental sales benefit.
  • Built an automated email alerting tool based on these metrics to assist operations support teams in resolving stores' issues related to inventory accuracy. Results of A/B testing indicated a further 0.5% increase in IA, equivalent to $3M annually.
  • Developed algortihms to track all back-of-house to shop floor replenishments and measure on-shelf availability, consequently exposing a $12M opportunity to eliminate lost sales.
  • Lead a project aimed at validating opportunities and enhancements to the digital replenishment process, providing all analytical support. In particular, built a model to estimate sales uplift, at $15M, and a prototype for product-wise prioritised replenishment.

Feb 2022 - Jul 2023
Kmart Group, AU

Data Scientist (Graduate)

  • Developed and deployed the use of new performance metrics across store operations using RFID data. This was one of the first use cases in which data could be leveraged to track a stores compliance to common tasks. One of example of such was replenishment compliance, where release of this KPI in production reporting helped drive a 30% increase in task completion rates across the business.
  • Built a predictive time-series model for customer service desk labour. Net productivity benefit as a result of optimising efficiency in this area exceeded $4M.
  • Worked alongside the Shrink and Fraud Prevention teams to track stock anomalies, and developed an ML model to predict loss at yearly stocktake at 85% accuracy.
  • Maintained and deployed a recommendation engine to assist apparel merchants which product ranges to keep/remove each season based on product substitution.

Skills

General

  • Retail Operations
  • Problem Solving
  • Stakeholder Management
  • Communication
  • Machine Learning
  • Business Analytics
  • Cloud Computing
  • Web Development
  • Relational Databases
  • Extract, Transform, Load (ETL)
  • Documentation

Tech.

  • Python
  • R
  • SQL (Postgres, MySQL)
  • Version Control (Git/GitHub)
  • Snowflake
  • AWS
  • Docker
  • Microsoft Office Suite (PowerBI, Excel, Powerpoint)
  • Flask
  • HTML
  • CSS