Hey, I'm Kyohei! 👋
About
I'm a JavaScript Developer with 10+ years of experience in web systems development.
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Expertise: TypeScript, Node.js, React, Serverless, Technical SEO.
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Love: Open Source Software, Personal development(個人開発)
Career
Nulab Inc. - Jan 2021 - Jan 2023
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Development of the project management tool Backlog.
Sharefull Co., Ltd. - Aug 2018 - Jan 2021
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Started the development of a new service called Sharefull, a matching platform for companies and workers for gig work.
PERSOL PROCESS & TECHNOLOGY CO., LTD. - Apr 2016 - Aug 2018
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New development of Hito-link Performance, goal management, and evaluation system for human resources.
If you need a detailed explanation (results and impacts), please contact me via LinkedIn. Then, I'll send you a complete resume.
Articles
This article will introduce you to a collection of libraries for creating PDFs in Javascript, showing their use-cases and comparing their features. In particular, I focus on the following aspects:
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Is it easy to integrate with a modern front-end application?
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Does it work in Node or the browser?
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Is it available as a UMD module?
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Is it a Typed library?
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Does it support custom fonts?
I suggested using Github to manage a personal task, which is already familiar to engineers, and using it for projects other than system development. It can be used as a free and convenient project management tool.
For example:
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You can create a project called "house moving," create an Issue of things to do, write down the procedures and other details, and manage them in the Kanban section.
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Set up an "Issue" of the book to read, and then once you read it, you can leave a comment on your "Issue" notes.
This article explains how to use the Chrome extension called React Inspector and how it works.
Projects
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Typescript, Node.js, React, webpack
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I developed this library with the aim of providing a better declarative style PDF generation library.
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After the release, it received over 130 Upvotes on ProductHunt and over 1800 stars on GitHub.
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Chrome Extensions, Typescript, CRXJS
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React inspector identifies React source code and opens it from an HTML element in the browser.
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More details on how it works can be found in this document
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Typescript, React, Gatsby, Firebase
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PDF creation service to create address labels and barcodes.
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I manage everything by myself, including development, UI/UX design, and marketing.
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2 years after the first release, it has registered 15,000 users and an average of 300,000 monthly PV. Monetized over $4,000 MRR in subscriptions, advertising, and API integration with external enterprise services.
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React, Web worker
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I created a spreadsheet-based step sequencer using handsontable, a data grid library.
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I separated sound processing into worker threads using Web workers to avoid rhythm delays and display render delays.