Peifeng Wang — Full-Stack Engineer, Tokyo

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[email protected]LinkedIn GitHub

wangpeifeng.com

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© 2026 PEIFENG WANG

AVAILABLE

THEME

2026.6

[email protected]

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© 2026 PEIFENG WANG

>ls -lt /users/peifeng/posts/ | filter --featured

// FEATURED_POSTS

I Built a Simple Japanese Vocabulary Tool for Myself — Kotoba

I built Kotoba for my own Japanese study—a lightweight JLPT vocabulary trainer with N5–N1 word learning, daily challenges, mistake review, local progress tracking, and PWA support.

Sky Finance Series #1: From POC to a Systematic RAG Platform — Architecture Overview

I rebuilt and open-sourced Sky Finance — this post is the first in a series documenting the project. It covers the overa…

Rebuilding My Personal Site: Cyber, Sakura & Pixels

Four themes, one system — a Vim-terminal dark mode, a clean light counterpart, a Sakura · Fuji palette drawn from living…

// ALL_POSTS

>ls -lt /users/peifeng/posts/ | head -5

I Built a Simple Japanese Vocabulary Tool for Myself — Kotoba

2026.06.21I Built a Simple Japanese Vocabulary Tool for Myself — KotobaTECH→

What 12 Years Across China and Japan Taught Me About Where Engineers Actually Grow

2026.06.10What 12 Years Across China and Japan Taught Me About Where Engineers Actually GrowLIFE→

Sky Finance Series #1: From POC to a Systematic RAG Platform — Architecture Overview

2026.05.10Sky Finance Series #1: From POC to a Systematic RAG Platform — Architecture OverviewTECH→

Rebuilding My Personal Site: Cyber, Sakura & Pixels

2026.05.09Rebuilding My Personal Site: Cyber, Sakura & PixelsTECH→

SkyFinance POC: I Built a Personal Stock Alert System with Local LLMs and Cloud AI

2026.04.05SkyFinance POC: I Built a Personal Stock Alert System with Local LLMs and Cloud AITECH→

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