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  • 🔭 I’m a self-employed Functional runtime engineer.
  • 🌱 I’m a Master of Arts and Science degree.
  • 👯 I’m looking for a job.
  • 📫 How to reach me: Twitter @kozy_kekyo (English) / Mastodon (Japanese).
  • 😄 English nickname's kozy, pronouns same as cozy. Japanese nickname's kekyo (I feel it pronounce's bit difficult :)
  • Fun fact: A bicycle rider. I'm good at long riding, maybe called randonner.

Hi! my name is Kouji Matsui. Please call me kozy (pronounce same as cozy) I'm an functional runtime engineer.

What are functional and runtime? In my reason:

  • Functional: Functional language design on computers. It means my own doing (progressing) research project, it will open and turn to OSS!
  • Runtime: Runtime structure and design on computers. It's already opened IL2C.

These projects are too big in my mind and I can design and develop only in my free time. I'm verry happy if you make a bit sponsorship :)

Far future, I will change and work only my projects if receive many patrons!

Active/showcase projects

IL2C RelaxVersioner

Epoxy FlashCap

DupeNukem TypeInferencer

ILCompose ILAsm.Managed

MeCab.DotNet NamingFormatter

Marionetta ILRepack.FullAuto


Conceptual / Early stage

FlyFlint Favalon

PowerPlay Zipper Fluorite

MarkTheRipper Lepracaun

Small scripts / tools

fdk-aac-win32-builder qemu-debian-mipsel-setup

gcc-toolchain ga_ubuntu_runner

spigot-builder NuGetBulkDownloader

IoT things

PedestrianController BrainPadWiFi

EaglePanelizer ExtremeFeedbackDevice

MeowLTE OpenOCDonMinGW

Spartan2Bone PGA44DIP44


Point implementation


Kinda joke

SushiRotator Outernet Explorer

Community activities


dotnetconf2019 decode2019_CM12

CSharpMonadic Nagoya.LifelongLearningCenter

Older (Retired/Archived)

fscx FusionTasks

ExaSerializers TortoiseMergePortable

JenkinsBuildNotifier SynchContextSample


  1. IL2C Public

    IL2C - A translator for ECMA-335 CIL/MSIL to C language.

    C# 352 30

  2. Epoxy Public

    An independent flexible XAML MVVM library for .NET

    C# 112 6

  3. A Japanese morphological analysis engine for .NET Core.

    C# 41 5

  4. An easy, full-automatic, git based version inserter for .NET 6, 5/.NET Core/.NET Framework.

    C# 25 5

  5. FlashCap Public

    Independent camera capture library on .NET/.NET Core and .NET Framework.

    C# 30 2

  6. DupeNukem Public

    WebView attachable full-duplex asynchronous interoperable independent messaging library between .NET and JavaScript.

    C# 6

3,633 contributions in the last year

Dec Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Mon Wed Fri
Activity overview
Contributed to kekyo/FlashCap, kekyo/MarkTheRipper, kekyo/FlyFlint and 30 other repositories

Contribution activity

December 2022

Created 1 repository
24 contributions in private repositories Dec 1 – Dec 7

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