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ウェブ開発者・経験8年

について

はじめまして。ヨハネスと申します。スウェーデン出身のウェブ開発者です。8年以上の開発経験があり、Umbraco CMSを専門にしています。 日本の企業で働きながら、日本語力をさらに高めたいと思っています。 どうぞよろしくお願いいたします。

プロフェッショナル経験

As an Umbraco developer, I have delivered a wide range of projects. From fully customized e-commerce solutions to CRM synchronization and tailored content management features. My work includes building secure APIs, creating internal tools to improve workflows, and developing award-nominated open-source packages. With experience in Umbraco 7 through 13, I combine deep platform knowledge with a focus on performance, maintainability, and user-friendly design.

主な実績

8+ years professional web development
Launched and managed my own web development agency
5 open-source packages published
2x Umbraco package award nominee
Contributed features to official Umbraco CMS
Johannes Lantz

働き方とチームワーク

I enjoy solving problems and bringing positive energy and optimism to the team, always curious and eager to learn something new. Whether working with others or independently, I aim to deliver solutions that are both creative and reliable. I continue learning through personal projects like Studify, my AI-powered Japanese study companion, and by contributing to open-source projects. This constant improvement helps me bring fresh ideas and better solutions to every team I work with.

日本との繋がり

My motivation to work in Japan comes from both career goals and personal experiences. I spent four transformative months living and studying in Japan, where I developed functional conversational skills and a deep appreciation for Japanese work culture and attention to detail. I'm actively studying Japanese (currently around N4 level). My goal is to relocate to Japan and contribute to innovative Japanese companies, bringing my international perspective while embracing Japanese professional values of excellence and continuous improvement.

日本の実績

4 months living and studying in Japan
Active Japanese language study (around N4 level)
Built AI study tools for Japanese learning
Intent to relocate and work in Japan long-term

技術スタック

Umbraco CMS
C#
.NET Core / .NET Framework

その他の技術

フロントエンド・フレームワーク
※ React
AngularJS
Javascript
※ TypeScript
HTML5
CSS3
※ Tailwind CSS
Bootstrap
jQuery
バックエンド・API・統合
.NET Maui
Razor
Umbraco Commerce
※ Node.js
※ Python
SQL Server
REST API
SignalR
E-commerce
CRM integrations
テスト・ビルドツール
NUnit
GitHub Actions
Swagger
Postman
Gulp
NuGet
ツール・プラットフォーム
Git/GitHub
Visual Studio
Papercut SMTP
Vercel
Windows Server

学習中

注目プロジェクト

「Auto dictionaries」
Umbracoパッケージ
x2 Umbraco package award nominee

「Auto dictionaries」

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An open-source package for Umbraco 8+ that automates the creation of dictionary entries, saving developers time on repetitive content tasks. Built to solve a recurring problem in our copmany projects.

技術スタック

Umbraco
C#
AngularsJS
NuGet
「uSupport」
Umbracoパッケージ

「uSupport」

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uSupport is an feature rich ticketing system designed specifically for the Umbraco. It is a complete ticketing solution that enables users to create, manage, and view tickets and their associated comments.

技術スタック

Umbraco
C#
AngularJS
NuGet
「Auto block list」
Umbracoパッケージ

「Auto block list」

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An automation tool for Umbraco that converts nested content into a block list format, while preserving and transferring all existing content. Created to save developers hours of manual content migration.

技術スタック

Umbraco
C#
AngularJS
SignalR
NuGet
「Move dictionaries」
Umbracoパッケージ

「Move dictionaries」

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A utility package for Umbraco 8 that allows developers to move dictionary entries instead of recreating them, streamlining site content management. Created to improve workflow efficiency. I later contributed this functionality to the official Umbraco CMS, making it a standard feature available to all users.

技術スタック

Umbraco
C#
AngularsJS
「UmbracoNaviHideIcon」
Umbracoパッケージ

「UmbracoNaviHideIcon」

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UmbracoNaviHide is a umbraco v8+ package that displays an icon on the content nodes that are not visible on the front-end.

技術スタック

Umbraco
C#
AngularsJS
「Studify」
アプリ

「Studify」

An AI-powered “study companion” chatbot built to support my Japanese learning. It suggests writing topics, checks grammar, and provides detailed feedback to help improve my writing skills.

技術スタック

.NET MAUI
C#
AI
Github Actions
「Japanese study」
プログラム

「Japanese study」

A Python-based tool that transcribes audio from Japanese lessons and uses AI to generate concise summaries. Designed to speed up my own study process by turning long audio lessons into easily reviewable study notes.

技術スタック

Python
AI
「Weberistic」
個人事業主

「Weberistic」

Started my own web development business during high school after an inspiring internship. I took on small web projects while studying, which was both a fun challenge and a way to earn extra money. Although I am not actively seeking new clients via this business today, the experience taught me entrepreneurship, client communication, and time management at a young age.

技術スタック

Umbraco
Webdevelopment
HTML5
CSS3
JavaScript
jQuery

お問い合わせ

一緒に働きませんか? 日本での新しいチャンスについて話し合いましょう

LinkedIn

プロフェッショナルネットワーク

LinkedIn QR Code

GitHub

コードとプロジェクト

GitHub QR Code

LINE

カジュアルチャット

LINE QR Code