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Working from home


  • Arctic Code Vault Contributor


@apache @trafficserver-doc-ja @http2jp @mercari


My account name is originated from cream puff, shucream but now it's meaningless 😭. I'm a software engineer living in Japan, and have specialized big-data domain in recent few years.

My career

  • Apr 2013 - Aug 2017: A full-time job as a software engineer. Yahoo! JAPAN
  • Aug 2017 - now: A full-time job as a software engineer. Mercari, Inc.
  • A part-time job as a software engineer at Repro Inc.



My products


My open contribututions



  1. HAKAGI(葉鍵, Leaf and Key) is a RDB analyzer that detects implicit foreign key constraints and others

    Go 34 5

  2. mastodon client module for Haskell

    Haskell 26 9

  3. Jmeter HTTP/2 sampler

    Java 24 14

  4. Enchant Apache Traffic Server with mruby power.

    C++ 12

  5. Make record oriented data to columnar format.

    Go 14 2

  6. Cloud Spanner DDL parser in Go

    Go 8 2

5,470 contributions in the last year

Oct Nov Dec Jan Feb Mar Apr May Jun Jul Aug Sep Oct Mon Wed Fri

Contribution activity

October 2020

305 contributions in private repositories Oct 1 – Oct 22

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