Masatoshi Shimada
Software Engineer at software house
Chiyoda, Japan
Summary
👤
Senior🎓
Top SchoolMasatoshi Shimada is a software engineer and data platform specialist with 11+ years of experience building and operating large-scale data systems across internet advertising, video, retail, finance, and government sectors. He designs and manages data platforms (Databricks, BigQuery, Treasure Data) and MLOps environments, driving cost and performance tuning while translating analytical insights into executive-level recommendations. He has hands-on backend experience contributing to the notable open-source Embulk project—improving JSON parsing and robustness—and authored a technical book on data platform technologies published in 2025. Comfortable in both engineering and technical-consulting roles, he combines system design, team leadership, and organizational development to help companies unlock value from their data. An uncommon detail: he started from a chemical engineering background, bringing a methodical, measurement-driven approach to data platform problems.
11 years of coding experience
5 years of employment as a software developer
Bachelor, Chemical Engineering, Bachelor, Chemical Engineering at 芝浦工業大学 / Shibaura Institute of Technology
Github Skills (7)
json-parser10
json10
javas10
jsonp10
parsing10
java10
unit-testing9
Programming languages (5)
Github contributions (5)
embulk/embulk
May 2017 - Jun 2018
Embulk: Pluggable Bulk Data Loader.
Role in this project:
Back-end Developer
Back-end DeveloperContributions:1 review, 8 commits, 3 PRs in 1 year 1 month
Contributions summary:Masatoshi primarily contributed to the `embulk/embulk` repository by implementing and refining the JSON parser plugin. They added functionalities such as a "clean illegal char mode" to handle invalid characters and introduced an `InvalidEscapeStringPolicy` to manage escape string handling. Additionally, the user fixed issues and improved existing code by incorporating reviews and addressing merge conflicts, showing continuous development and improvement efforts.
artemisembulkbulk-databulk-loaderdata-loader
smdmts/dbc-scala_ks_2018
Oct 2018 - Apr 2024
Contributions:10 pushes, 1 branch in 5 years 6 months
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