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一輝 長谷川
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一輝 長谷川

@kazukihasegawa

Data Scientist / Machine Learning Engineer / Econometrst

Japan
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At STAR AI Inc., I estimate the causal effects of telecom coupon campaigns and apply NLP to insurance survey responses to surface customer insights. I also run client AI projects from problem framing through modeling and reporting, and mentor junior staff in statistical analysis.

At Sumitomo Electric Industries, Ltd., I developed traffic-volume prediction for government clients and built arrival-time prediction and dashcam image-analysis systems for automotive applications. I also forecast electricity demand and prices and proposed energy management systems for power utilities.

As a contract Machine Learning Engineer at SO Technologies Inc. and INTAGE Inc., I built and improved ad prediction and optimization models, and developed a system that scores ad appeal from images. My work combined NLP and image analysis with tools including Keras, PyTorch, LightGBM, and Google Cloud Platform.

My research and earlier work include causal inference, econometrics, and spatial machine learning, alongside regional studies research at Osaka University. I hold an M.S. in Informatics from Kyoto University and an M.A. in Economics from Osaka University, and bring together econometric methods and machine learning in projects across telecom, insurance, advertising, and automotive.

Experience

Work history, roles, and key accomplishments

SI
Current

Econometrician & Data Scientist

STAR AI Inc.

Feb 2025 - Present (1 year 8 months)

Estimate causal effects of telecom coupon campaigns using statistical causal inference. Apply NLP to survey responses and manage client AI projects end to end.

SL

Data Scientist, Business Development

Sumitomo Electric Industries, Ltd.

Apr 2022 - Feb 2025 (2 years 10 months)

Developed traffic-volume prediction and arrival-time prediction systems for automotive clients. Built image analysis for dashcam footage and forecasted electricity demand.

SI

Machine Learning Engineer

SO Technologies Inc.

Apr 2022 - Sep 2023 (1 year 5 months)

Built and improved click-through-rate prediction and ad-text optimization models. Designed data flows combining client data with web-scraped data.

II

Machine Learning Engineer

INTAGE Inc.

Aug 2022 - May 2023 (9 months)

Developed a system that scores ad appeal from people and products detected in images and proposes improvements.

OU

Research Assistant

Osaka University

Jan 2021 - Mar 2022 (1 year 2 months)

Designed surveys, ran statistical analysis and reported findings for regional studies research.

MP

Digital Specialist

METI Furusato Co-LEAD Program

Oct 2021 - Feb 2022 (4 months)

Provided DX consulting for manufacturers and service firms in Kuwana, Mie.

OM

Data Analyst

Osaka University MMDS

Jan 2020 - Dec 2020 (11 months)

Conducted natural-experiment evaluation of cashless payments and POS-based inventory optimization.

NC

Corporate Planning

Nipro Corporation

Apr 2019 - Feb 2020 (10 months)

Handled group financial planning and cost and productivity analysis of Nipro JMI (Bangladesh).

Education

Degrees, certifications, and relevant coursework

Kyoto University logoKU

Kyoto University

Master of Science, Informatics

2024 -

Activities and societies: Collective Intelligence (Kashima–Takeuchi Lab)

Pursuing an M.S. in Informatics with a focus on data science and collective intelligence, expected to complete in 2026.

Osaka University logoOU

Osaka University

Master of Arts, Economics

2020 - 2022

Activities and societies: JASSO scholarship with full repayment waiver for outstanding achievement

Earned an M.A. in Economics with a focus on empirical industrial organization, including minor programs in data science, mathematical modeling, and mathematical finance.

DeepLearning.AI logoDE

DeepLearning.AI

Specialization, Deep Learning

Completed the Deep Learning Specialization on Coursera.

Massachusetts Institute of Technology logoMT

Massachusetts Institute of Technology

MicroMasters, Data, Economics, and Design of Policy

Completed the MITx MicroMasters program in Data, Economics, and Design of Policy.

Hitotsubashi University logoHU

Hitotsubashi University

Bachelor of Arts, Economics

2015 - 2019

Activities and societies: Public Finance Seminar (Prof. Motohiro Sato)

Completed a B.A. in Economics, participating in the Public Finance Seminar.

Tech stack

Software and tools used professionally

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