Senior Front-end Engineer (7+ years) based in Tokyo 🇯🇵, building practical products at the intersection of AI, language learning, and developer tools.

I specialize in scaling front-end systems, modernizing legacy platforms, and shipping tools people actually use daily.

• 📚 Language learning tools with practical daily use (not demo-ware)
• 🧩 Chrome extensions for instant context, vocabulary, and reading support
• 🤖 AI-assisted workflows for transcripts, grammar explanation, and review systems
• ⚡ Small products that prioritize speed, clarity, and real outcomes

I’m deeply interested in applied AI — especially using LLMs to improve real workflows, not just demos.

Current focus areas:

• 🔍 RAG-based learning/support experiences
• 📝 Prompt design and evaluation loops
• 🧙‍♂️ Lightweight AI agents for language learning and productivity
• 🧪 Turning small AI experiments into daily-use products

• ⚔️ kanji-kaisen A gamified kanji learning app that combines spaced repetition with stroke recognition to make daily practice engaging and effective.
• 🧩 katachi A polished Japanese conjugation trainer built to help learners master core grammar forms through focused, repeatable practice.
• 🔁 lingoloop A modern loop player for language learners that supports precise A-B repeat, shadowing, and recording across local media and YouTube.
• 🧠 Lingo-context A Chrome extension that delivers instant AI-powered context, grammar explanations, and pronunciation support while you read.
• ✒️ moji-fu A lightweight Chrome extension for capturing and reusing web font styles with a single click.
• 🎬 subtitle-pipeline A subtitle processing toolkit for extracting, merging, and preparing bilingual subtitles for language learning workflows.
• 🖌️ kanji-recognizer A lightweight JavaScript library for kanji stroke recognition and validation built for interactive writing practice.

• 🎴 anki-jlpt-n2-grammar-example-sentences JLPT N2 grammar Anki deck with examples and audio support.
• 🎴 anki-jlpt-n1-grammar-example-sentences JLPT N1 grammar Anki deck with examples and audio support.
• 🎴 Shin Kanzen Master N3 Grammar, Sentence Deck N3 grammar sentence deck based on Shin Kanzen Master, with structured lesson coverage and audio.

• 🇨🇳 Mandarin (Native)
• 🇺🇸 English (Professional working proficiency, CEFR B2)
• 🇯🇵 Japanese (JLPT N2, pursuing N1)

• 🎌 Learning Japanese
• 🏗️ Building tiny tools that compound over time
• 🔬 Going deeper on applied AI engineering