Kan-ru Chen
Principal Software Engineer at Indeed
Chiyoda, Japan
Summary
🤩
Rockstar🎓
Top SchoolKan-ru Chen is a Principal Software Engineer based in Chiyoda, Japan, with 14 years of experience building resilient, high-throughput backend systems at companies like Indeed, Amazon Japan, and Mozilla. He combines deep systems and architecture expertise—having refactored IPC and JS engine components at Mozilla—with hands-on service design and SLO-driven operations for enterprise Java systems at Amazon and feature-driven product work at Indeed. An active open-source contributor, Kan-ru has improved developer tooling and language runtimes, notably simplifying the StumpWM window manager and enhancing the copier project’s CLI and maintainability, as well as contributing to a Lisp-to-JS compiler and a Common Lisp IDE. He is known for pragmatic refactors that remove legacy cruft, improve performance and observability, and make complex codebases more maintainable for teams.
14 years of coding experience
14 years of employment as a software developer
Master, Computer Science and Information Engineering, Master, Computer Science and Information Engineering at National Chi Nan University
English, Chinese
Stackoverflow
6,737reputation
1.9mreached
75answers
41questions
common-lisp
top-5%
Github Skills (33)
javascript10
python10
architecture10
refactor10
compiler-design10
project-template10
emacs10
common-lisp10
window-management10
refactoring10
architectures10
lisp10
command-line-interface9
develop9
scaffolding9
Programming languages (20)
Github contributions (5)
stumpwm/stumpwm
Feb 2015 - Aug 2022
The Stump Window Manager
Role in this project:
System Architect / Software Architect
System Architect / Software ArchitectContributions:38 reviews, 119 commits, 161 PRs in 7 years 7 months
Contributions summary:Kan-ru primarily refactored and simplified core components of the StumpWM window manager, including code related to timers, keymaps, and event handling. They removed obsolete workarounds, deprecated functions, and unused variables, streamlining the codebase. Additionally, the user improved the structure and clarity of several functions, demonstrating a focus on code maintainability and efficiency within the window manager. The user also added dependencies.
x11linuxwindowwindow-manager
joaotavora/sly
Apr 2015 - Dec 2018
Sylvester the Cat's Common Lisp IDE
Role in this project:Backend Developer
Backend DeveloperContributions:1 review, 14 commits, 23 PRs in 3 years 8 months
Contributions summary:Kan-ru primarily contributed to the backend of the "sly" project, a Common Lisp IDE. Their work involved modifying keybindings for the documentation, adding keymap information to the manual, fixing typos, and adding docstrings for specific functions. They also addressed issues related to number printing and completion behavior, and implemented changes to improve the performance and stability of the IDE.
emacslisp-interpreteremacs-lspidelisp
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