Kenji Yoshida
Managing Director at SoftBank Group
Tokyo, Japan
Summary
🤩
Rockstar🎓
Top SchoolKenji Yoshida is a Tokyo-based Managing Director with 15 years of experience combining capital markets leadership and hands-on software engineering expertise. He has led strategic risk and structured asset teams at Citi and BNP Paribas before moving into senior roles at SoftBank, blending deep financial product knowledge with technology-driven process improvements. An active open-source contributor in the Scala ecosystem, Kenji has made substantive technical contributions to high-profile projects such as Akka, Scala compiler work, Cats, Play Framework and many tooling and JSON libraries, often improving build compatibility, performance and documentation. He brings rare cross-domain fluency—able to refactor compiler-level code and manage complex financial syndications—and has a track record of keeping long-lived projects current across evolving Scala and JVM versions. Educated at Keio University in economics, he also invests in and advises ESG startups, reflecting a broader interest in sustainable innovation alongside technical rigor.
15 years of coding experience
経済学部, 経済学部 at Keio University
Stackoverflow
3,108reputation
239kreached
33answers
11questions
sbt
top-5%
scala
top-5%
Github Skills (144)
dependency-management10
datetime10
authorizations10
serializable10
csv-parse10
compiler-development10
testing10
generic-derivation10
databases10
http10
authentication10
deserialization10
javas10
generic-programming10
specification10
Programming languages (15)
Github contributions (5)
json4s/json4s
Dec 2012 - Jan 2023
JSON library
Role in this project:
Back-end Developer
Back-end DeveloperContributions:101 reviews, 914 commits, 1005 PRs in 10 years 2 months
Contributions summary:Kenji focused on improving the performance of the JSON4s library by replacing the `ApplicativeBuilder` with `Apply[Result].applyN` in several files. The changes involved refactoring code in the `scalaz` package, specifically in files related to `Lifting` and `Tuples`, which likely optimizes JSON parsing and processing within the library. Furthermore, the user contributed to the project by overriding the `JObject#hashCode` method and by making code formatting corrections.
json-libraryscalajacksonjsonjson-parser
tototoshi/scala-csv
Apr 2014 - Apr 2021
CSV Reader/Writer for Scala
Role in this project:Back-end Developer
Back-end DeveloperContributions:2 reviews, 117 commits, 183 PRs in 7 years
Contributions summary:Kenji primarily contributed to the Scala-CSV library by adding support for new Scala versions and updating dependencies. They incorporated new features like -Ywarn-unused compiler options and javacOptions for compilation. The user also focused on improving the code by optimizing CSV parsing logic, fixing bugs, and migrating to a newer build system.
csv-readerscala
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