Okamoto Takashi
Freelance Web & AI Developer
Tools I build, and ship myself.
Web apps and AI tools for people living, working and travelling in Japan. I also build for teams that need it done.
7 products liveBased in Japan
Products
Visa Support
Vietnamese residents in Japan
Prepare your residence-status renewal paperwork yourself. A guided form fills the official Excel and gives you a document checklist.
Web appOpen visa.okadev.jp βAutoPrint
Small offices in Japan
Windows app that watches a folder and prints new files on the printer you choose.
Windows appOpen autoprint.okadev.jp β
Client Work
What I build
- Web Applications
Homepages, SaaS products, booking systems, inventory & warehouse management β scalable apps built with Next.js, TypeScript, and Supabase.
Next.jsTypeScriptSupabaseFirebaseTailwind CSSMantinePythonGoogle Apps Script - AI Feature Integration
LINE chatbots, AI recommendation engines, conversational UIs β practical AI wired into your product.
ClaudeGeminiOpenAILINE Messaging API - Multilingual Sites
Full EN/JA/VI sites with i18n routing and content management. I've shipped this β I know the pitfalls.
next-intlζ₯ζ¬θͺEnglishTiαΊΏng Viα»t
Work with me
Building a web app, adding AI features, or launching a multilingual site? I'd love to hear about it β I reply within a day.
Get in touch