Suyeol Jeon
CTO at Indent Corp.
Seoul, South Korea
Summary
🤩
Rockstar🎓
Top SchoolSuyeol Jeon is a seasoned software leader and CTO based in Seoul with 14 years of experience building consumer mobile apps, developer libraries, and end-to-end platforms. He co-founded and led engineering at Approach (포켓레슨), shipping React Native and native iOS apps plus backend systems for remote sports coaching, and now drives technical strategy at Indent Corp. A prolific open-source contributor under devxoul, he created and maintains popular Swift libraries such as ReactorKit and Then and has contributed to widely used projects like Moya and RxSwift. His work emphasizes reactive architectures, clean APIs, and pragmatic tooling that reduce repetitive work—true to his self-described “lazy programmer” ethos of writing more code to code less. He combines hands-on implementation, test-driven quality, and product-minded engineering, having scaled apps at StyleShare and led startups from idea to acquisition. Unusually, he reached elite recognition early as the youngest final certifier in Korea’s SW Maestro program, reflecting both early talent and sustained impact.
14 years of coding experience
11 years of employment as a software developer
Qualification for High School Graduation (검정고시)Hacking and Defence, Hacking and Defence at Korea Digital Media High School
Korean, English
Stackoverflow
2,148reputation
516kreached
15answers
0questions
ios
top-5%
swift
top-5%
Github Skills (54)
unit-testing10
uiimage10
json10
uitextview10
objective-c10
ios10
rxswift10
uibezierpath10
mobile-development10
object-mapping10
reactiveswift10
testing10
swiftui-app10
user-interface10
ui-design10
Programming languages (20)
Github contributions (5)
devxoul/Then
Dec 2015 - Apr 2022
✨ Super sweet syntactic sugar for Swift initializers
Role in this project:
Full-stack Developer
Full-stack DeveloperContributions:20 releases, 1 review, 121 commits in 6 years 5 months
Contributions summary:Suyeol's contributions primarily focused on creating and maintaining the `Then` library for Swift. They started the project by initializing the Xcode project and added core functionality, including a protocol and extensions to enable setting properties with closures after object initialization. Subsequent commits involved making the library public, refining functionality for both class and value types, and expanding its utility with the introduction of a `do()` function. They also updated tests and implemented code style improvements.
syntactic-sugarinitializerssugarsyntacticswift
devxoul/UITextView-Placeholder
Dec 2014 - Jan 2020
A missing placeholder for UITextView
Role in this project:iOS Mobile Developer
iOS Mobile DeveloperContributions:16 releases, 84 commits, 38 PRs in 5 years 2 months
Contributions summary:Suyeol primarily contributed to an iOS project, adding a placeholder feature for UITextView. Their work involved creating a demo project to showcase the functionality, hooking the dealloc method, and modifying the placeholder label to support multiple lines and adjust to text container insets. Key contributions included adding attributed placeholders, making placeholder and placeholderColor IBInspectable, and fixing bugs related to font and text adjustments. The user appears to have also refactored the project, migrating to an Xcode project, defining a module map and adding test code.
swiftiosuikitmissing
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