Takeru Chuganji
Software Engineer at 自営業
Kurashiki, Japan
Summary
👤
Senior🎓
Top SchoolTakeru Chuganji is a seasoned software engineer with 11 years of experience building and scaling mobile and backend systems, currently based in Kurashiki, Japan. He progressed to Staff and Principal roles at Mercari, where he led large engineering efforts—including a company-wide React Native rewrite that improved app store ratings, reduced binary size, and tripled team efficiency while preserving a 99.99% crash-free rate. Deeply experienced across Swift, Kotlin, Objective-C, Go and TypeScript, he’s delivered end-to-end solutions from architecture and networking to CI/CD and release automation. An active open-source contributor, he has improved build and release workflows in high-profile projects like fastlane and enhanced dependency management in Carthage. He pairs hands-on engineering with technical leadership—mentoring teams, driving roadmaps, and establishing automated release cycles. Less obvious: he blends a design-oriented education with pragmatic backend expertise, enabling thoughtful product-driven engineering decisions.
11 years of coding experience
8 years of employment as a software developer
Design, Art and Information Design, Design, Art and Information Design at 九州大学
Japanese, English
Github Skills (16)
package-manager-tool10
git10
swift10
automation10
automations10
package-manager10
fastlane10
cicd10
cocoa10
ruby10
carthage9
testing9
android9
ios9
mobile8
Programming languages (11)
Github contributions (5)
Carthage/Carthage
Jan 2018 - Sep 2019
A simple, decentralized dependency manager for Cocoa
Role in this project:
Backend Developer
Backend DeveloperContributions:28 commits, 7 PRs, 61 comments in 1 year 8 months
Contributions summary:Takeru primarily focused on modifying core functionalities related to dependency management within the Carthage project. They made changes to the `Project.swift` file to add a function for removing unused files, and modified `Outdated.swift` to show the outdated versions of dependencies. Additional changes were made to how the project handles dependencies and build options, showing a clear understanding of the project's architecture. These contributions suggest a focus on improving the core features and maintainability of the dependency management system.
cocoapodspodfilepackage-managerdecentralizedswift
fastlane/fastlane
Apr 2017 - Feb 2020
🚀 The easiest way to automate building and releasing your iOS and Android apps
Role in this project:Automation Engineer / Build & Release Engineer
Automation Engineer / Build & Release EngineerContributions:13 commits, 13 PRs, 25 comments in 2 years 10 months
Contributions summary:Takeru's commits primarily focus on improving the build and release process of the `fastlane` project. They modified existing actions, such as `push_git_tags` and `upload_symbols_to_crashlytics`, to enhance functionality and address bugs. Their contributions included adding options, correcting existing code, and improving test coverage, especially around edge cases. Several commits addressed specific issues related to file paths, versioning, and thread management, indicating a focus on robust automation.
fastlaneandroid-appsappsdeploymentreact-native
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