shintarou kawara

About Me

Hi I'm Shintarou Kawara as kwrsin.

I live in Fukuoka, Japan and have been freelancing as a software engineer for over 10 years.

I have a long experience in front-end development mainly. I used to develop ATMs for banking systems.

Now I'm building web applications for end users in Japan.

I am looking forward to taking on new challenges.

Here's a brief biography next to it

My Abilities

Developments

  • creating Web Applications
  • creating iOS Applications
  • creating Games Running on Web Browsers

My Experiences

Achievements

  • Boarding Tickets management
  • EA development for MT4
  • Inventory control
  • EC Shopping cart
  • ATMs for JP Banking
  • Development of many other web applications

Computer Languages

  • HTML4/5
  • Javascript
  • CSS2/3
  • Python
  • Java
  • Ruby
  • C++
  • SQL
  • Bash

Roles

  • Development Stuff

Human Languages

  • Japanese is Very Well.👍
  • English is OK. but I have Broken English.😓

My Artworks

Mini Local File Manager

2026-6
Mini Local FileManager 📁 A lightweight local file manager that runs entirely in your browser. No server setup, no cloud, no uploads—just fast and private file management on your own machine. Perfect for notes, Markdown, and local projects. #opensource #webdev #productivity Try it 👉 here!

Muscle Revenger

2026-4
MUSCLE REVENGER is an action-packed escape and revenge game where you play as Match, a justice-driven professional wrestler who has been falsely accused of a crime.

Set in a heavily guarded prison, you must fight your way through relentless guards, evade their pursuit, and use a variety of items to clear each stage. Your objective is to collect keys within the time limit, reach the exit, exact your revenge, and break out of prison.

Use skillful controls, precise timing, and smart strategy to overcome deadly traps and powerful boss enemies.

Will you be able to escape, reclaim your identity, and bring justice to those who betrayed you?

#MuscleRevenger #ActionGame #BroserGame #IndieGame #NewGameRelease
Try it 👉 here!

ACROSS RIDER

2025-
📣 New Release Alert!
📣 A high-speed mix of motorcycle racing and a man’s burning story — ACROSS RIDER is here! Race against time to place in the top 3, using coins, fuel, and jewels to gain the edge. With EASY and HARD modes, both beginners and pros can enjoy the thrill! Experience intense stages like “God Wind” and “Death Trains” — each packed with adrenaline and challenge. It all begins with a man’s wish: “I just want to make her happy.” But an unexpected deal with a mysterious agent turns his ride into a battle for fate! 🎮
Play now and carve your own racing legend!

Try it 👉 here!

#ACROSSRIDER #BikeGame #RacingGame #IndieGame #GamersUnite #NewGameRelease

MindElixler for Kwrsin

2025-
Organize your ideas with a free #MindMap tool 🧠 No login. No install. Just open in your browser. Try it 👉 here!

Pactack

2021-
How about a freshly-made text creation iOS app?

A text clipboard manager app! We've just released "Pastack".

It's a text clipboard management app for Mac users. You can manage your clipboard list on your iPhone. You can also tag clips and search them.
I hope this app will be a good companion when you create documents on your Mac.
I'd be honored if this app can help someone's writing.
I would be honored. Try it 👉 here!

Ran Ran Ranse

2019-2023
I still have been playing retro video games since I was a kit. I love them. my favorite genre is strategy game. Above all, I was getting into a Series of "Nobunaga no Yabo" from KOEI.
“Ran Ran Ranse(ランラン乱世)” is game that collaborated smart phone app which is simple and useful, with the genre of the game. one has just few commands and light weight, so whoever, wherever, whenever you can play it.
you can download it a below icon.

Flappy Chart

2018-
"Money comes and goes." right?
"No! Money has never come to me. My Money goes away from me all the time." "I want to be a last person who gets benefits of "Abenomix" which is composed three arrows."

to you
I am pleased to introduce this game as "Flappy Chart" and I'm sure that you would be happy by playing with it. I seriously recomend it.
you can play it here. Good Luck!

Okappa

2017-
I am afraid that there would be no one put a plastic model on his/her head in japan.
No! they are there. I have evidence they exist.

Look here.
this is one of 3d models I reproduced from collected data when I discovered them. her name is okappa from plastic ne-san who created by blender which is 3d modeling tool .
this is my result of years of research i've been searched.

Please take a look.

Yabusame
Horseback Archery

2014-2019
Here is a game app scrolling infinitely which a player on horse having a bow and arrows is going to destroy targets to get high scores. Why I decided to create one was to aim at getting a position of horrible game like flappy bird.
He died, safely, in 2019, without gaining popularity.

Plus 1 Count

2015-2018
It was a simple counter that was included Apple's GAME CENTER. the app could increment or decrement one by one from 0 to 99,999 limited and clear a counter. and one could compete to friends. he was retired his career as Apple's App Store was updated.

Pochittona

2015-2015
even though you push the button, a lot of mechas (i.e. tiny robots) does not rush out of a parent's mouth as fighting supporters.

"... what do you mean? " you might think.
I know. me too.
What I want to say is that this is a browser extension for safari, mac os x. and allow you to scroll a page while moving your mouse.
That's it.
but, she died prematurely only around 3 months. because apple's safari extension galleries often had changed their security rules. in result, the author was at a lost and gave up developing it.

rest in peace.

Contact Me

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Please feel free to contact me using below Email/SNS icons, if you have any questions or requests.