Jechol Lee
Co-Founder & CEO at Devall Company
Seoul, South Korea
Summary
🤩
Rockstar🎓
Top SchoolJechol Lee is an engineer-turned-founder and CEO with 11 years of experience building production-grade backends and developer-focused systems across startups and global firms, from Google to multiple CTO roles. Based in Seoul, he has led teams delivering high-traffic services—including Elixir/Phoenix backends for a top Korean crypto exchange and SaaS products for construction and agriculture—and he now runs Chungoose/Devall. A hands-on polyglot, Jechol contributes to notable open-source projects in the Elixir/Gleam ecosystem and is a recognized contributor to ReactiveKit and Bond for Swift, reflecting a rare blend of backend concurrency expertise and mobile-binding experience. He combines startup grit and growth-hacking instincts (e.g., doubling watch time at a major streaming service) with deep systems-level roots from early work in embedded and media frameworks. Notably, his open-source refinements to Gleam’s stdlib and Elixir monad utilities reveal a focus on maintainability and type-aware refactors that benefit both language users and production systems.
11 years of coding experience
17 years of employment as a software developer
Bachelor of Science (B.S.) Computer Science, Bachelor of Science (B.S.) Computer Science at Seoul National University
English
Stackoverflow
145reputation
4kreached
4answers
7questions
Github Skills (38)
ios10
strings10
elixir10
text-manipulation10
macros10
stl10
monads10
gleam10
swift10
uikit10
iterator10
reactive-programming10
concurrency10
functor9
url-parsing9
Programming languages (21)
Github contributions (5)
witchcrafters/witchcraft
Feb 2020 - Jan 2022
Monads and other dark magic for Elixir
Role in this project:
Back-end Developer
Back-end DeveloperContributions:4 reviews, 12 commits, 12 PRs in 1 year 11 months
Contributions summary:Jechol primarily focused on enhancing the codebase by modifying `__using__` macros within various Elixir modules, including `Setoid`, `Foldable`, and `Monad`. These changes aimed to improve how dependencies are managed and functions are imported within the witchcraft library. Additionally, the user addressed issues like nested monad returns and implemented improvements in the internal utilities for handling the project's functionality. The user also added documentation and nix configuration.
functortraversablemagiccategoryelixir
DeclarativeHub/ReactiveKit
Apr 2016 - Jan 2017
A Swift Reactive Programming Kit
Role in this project:Back-end Developer
Back-end DeveloperContributions:31 commits, 20 PRs, 24 comments in 9 months
Contributions summary:Jechol primarily focused on improving the core functionality and stability of the ReactiveKit library. Their work included fixing closures within the `areDistinct` and `lock.atomic()` functions, enhancing the efficiency of the `forEach` operation, and refining the stream and property implementations. The user also addressed issues related to interval streams and zip operations.
cloudkitreactive-programmingswiftiosmac-catalyst
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