Masahiro Wakame
システムエンジニア at Mercari, Inc.
Chiyoda, Japan
Summary
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Rockstar🎓
Top School
Top expert inFull-Stack JavaScript Development
Masahiro Wakame is a seasoned system engineer with 16 years of experience building backend systems, developer tools, and libraries, currently tackling hard problems at Mercari's Merpay Solutions team in Tokyo. He is a polyglot contributor comfortable with TypeScript and Go, with notable open-source work touching flagship projects like the TypeScript compiler and GraphQL tooling (gqlparser, gqlgen). His contributions range from language-level type system improvements and linting rules to implementing a Lisp interpreter in TypeScript and enhancing document conversion in Re:VIEW, showing both deep language knowledge and practical engineering. Known for shipping pragmatic libraries and refining developer experience, he combines production-grade backend engineering with active OSS maintenance—plus a quietly curious streak evidenced by hobby projects like Make-a-Lisp implementations.
16 years of coding experience
コンピュータサイエンス学部, コンピュータサイエンス学部 at 東京工科大学 / Tokyo University of Technology
Japanese
Stackoverflow
1reputation
0reached
0answers
0questions
Github Skills (65)
parser10
reader10
compiler-development10
ruby10
type-system10
evaluator10
code-generation10
linter10
linting10
lisp-interpreter10
markdown10
javascript10
type-inference10
static-analysis10
type-check10
Programming languages (19)
Github contributions (5)
vektah/gqlparser
Jul 2018 - Apr 2021
A port of the parser from graphql-js into golang
Role in this project:
Back-end Developer
Back-end DeveloperContributions:58 commits, 25 PRs, 7 pushes in 2 years 9 months
Contributions summary:Masahiro primarily contributed to the back-end aspects of the project, focusing on improving the GraphQL parser in Go. Their commits demonstrate a focus on fixing bugs related to field selection, fragment handling and validation of the schema. The user also improved the codebase with the addition of rules for known directives, fragment names, and variable handling.
golanggraphql-jsgraphqlparser
99designs/gqlgen
Jul 2018 - Jul 2022
go generate based graphql server library
Role in this project:Back-end Developer
Back-end DeveloperContributions:115 commits, 51 PRs, 83 pushes in 4 years 1 month
Contributions summary:Masahiro primarily focused on refactoring and improving the code generation aspects of the gqlgen library. They implemented features to handle types.yaml files and their parsing, including JSON and YAML, improving the flexibility of type mapping. The commits demonstrate contributions to core functionality by changing the core codegen file and also modifying testing functions. There are additional enhancements to the underlying structure through the addition of new functionality like field mapping.
golangcodegenartemissubscriptionsgraphql-tools
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