Tomoya Hayashi

S

Director of Data Science at Woolworths Group | ex-Atlassian

Woolworths Group
Tokyo, Japan · JST (UTC+9)
15+ years experience
University of Auckland
English, Japanese
Advising
Messaging unavailable

Overview

22 years in data science and analytics, the last 3 at Woolworths Group, where I lead the recommendations team. Taught SQL to 143 non-analysts. Most at home with Python and recommender systems.

Good reasons to reach out
  • Advice on recommendation systems
  • Questions about recommendation systems
Please don't message about
  • Crypto token projects
  • Courses and coaching offers
  • Data broker offers

Replies between meetings, usually same day

Skills
Sparkrecommender systemsPyTorchrankingPython
AdvisingOpen to advising
closes in 3 months

Office hours for early-stage teams: recommendation systems and PyTorch

Topics
recommendation systems, Spark, ranking
Format
Calls
Terms
Equity
Capacity
One call a month
Best for
Teams scaling past 50 people

22 years of recommendation systems. Can review plans, decks and hiring loops.

Tokyo, Japan · remote OKpythonpytorchranking
Open

Experience

  1. Director of Data Science
    Jun 2023 - Present
    Woolworths Group · 3 yr 4 mo · Full-time · Tokyo, Japan
    • Replaced 75 hand-built dashboards with one metrics layer people trust.
    • Built the recommendations models now used in 3 product decisions a quarter.
  2. Analytics Manager
    Jun 2021 - May 2023
    Atlassian · 1 yr 11 mo · Full-time · Tokyo, Japan
    • Replaced 91 hand-built dashboards with one metrics layer people trust.
  3. Data Analyst
    Dec 2017 - Jun 2021
    Xero · 3 yr 6 mo · Full-time · Tokyo, Japan
    • Taught SQL to 116 non-analysts.
  4. Senior Data Scientist
    Apr 2015 - Dec 2017
    LG Electronics · 2 yr 8 mo · Full-time · Tokyo, Japan
    • Taught SQL to 123 non-analysts.
    • Built the recommendations models now used in 5 product decisions a quarter.
  5. Data Analyst
    Aug 2011 - Jan 2015
    Samsung Electronics · 3 yr 5 mo · Full-time · Tokyo, Japan
    • Replaced 109 hand-built dashboards with one metrics layer people trust.

References

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Education

  1. University of Auckland
    BSc, Statistics
    1999 - 2003

Details

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