Yosuke Ishikawa
CTO at 10X, Inc.
Chiyoda, Japan
Summary
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Rockstar🎓
Top SchoolYosuke Ishikawa is a CTO and seasoned iOS engineer with 14 years of experience building type-safe networking and reactive systems from Tokyo’s Chiyoda district. He progressed from hands-on iOS roles at LINE and Mercari to technical leadership at 10X, blending product-focused engineering with team-level strategy. Yosuke contributes to notable Swift open-source projects—improving Result’s error handling and expanding test coverage for RxSwift Community’s Action—demonstrating care for robustness and testability. He also built demo applications and refactored networking abstractions for APIKit, showing an eye for clear API design and developer ergonomics. Known for refining core library behavior and test suites, he brings a pragmatic, detail-oriented approach that bridges low-level Swift types and high-level platform architecture.
14 years of coding experience
4 years of employment as a software developer
University of Tsukuba
Stackoverflow
141reputation
10kreached
4answers
0questions
Github Skills (18)
unit-testing10
rxswift10
testing10
networking10
reactive-extensions10
swift10
error-handling10
act10
actionresult9
rest-api9
resultset9
hresult9
macos8
ios8
coreanimation6
Programming languages (8)
Github contributions (5)
ishkawa/APIKit
Feb 2015 - Oct 2018
Type-safe networking abstraction layer that associates request type with response type.
Role in this project:
Back-end Developer
Back-end DeveloperContributions:71 releases, 727 commits, 254 PRs in 3 years 8 months
Contributions summary:Yosuke contributed to the development of the `apikit` library, which focuses on type-safe networking. Their work involved creating a demonstration application (DemoApp) to showcase the library's capabilities. This included implementing API requests for GitHub search functionality using Swift and APIKit, establishing a networking abstraction layer with associated response types, and defining model objects for data retrieval. Furthermore, the user refactored API class and tests to better use `ResponseBodyEncoding`.
networkingtype-safeabstraction-layerrequestalamofire
RxSwiftCommunity/Action
Jul 2016 - Dec 2016
Abstracts actions to be performed in RxSwift.
Role in this project:QA Engineer / Test Automation Engineer
QA Engineer / Test Automation EngineerContributions:2 releases, 54 commits, 19 PRs in 5 months
Contributions summary:Yosuke primarily contributed to the testing infrastructure of the `rxswiftcommunity/action` repository. They added tests for the `inputs` subject, the return observable of `execute()`, and execution counts, significantly expanding the test coverage. The changes include setting up test targets and implementing various test cases to validate the behavior of the `Action` class, which is central to the project's functionality, and involved both test setup and execution.
abstractsreactive-extensionsrxswiftperformedswift
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