Yuuichi Eguchi

Full-stack developer working with Python/FastAPI and TypeScript/Next.js.

Tokyo Joined on Nov 30, 2025 https://yuu1ch13-portfollio.vercel.app

Education

University of London

Work

Software Engineer

Yuuichi Eguchi

Oct 15

Seven rounds of AI code review in one day, 2,048 tests green, and the feature had never started once

#ai #codereview #testing #swift

14 min read

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Yuuichi Eguchi

Oct 8

What were my AI-written UI tests actually proving? Green XCUITests over a broken macOS terminal

#testing #swift #macos #ai

15 min read

Yuuichi Eguchi

Sep 14

What six coding-agent CLIs actually expose: hooks, permissions, subagents, and MCP config compared

#ai #claude #openai #cli

15 min read

Yuuichi Eguchi

Sep 14

What it takes to embed libghostty in a Swift app: six months of lessons

#ghostty #swift #terminal

14 min read

Yuuichi Eguchi

Mar 8

Calyx vs cmux: Choosing the Right Ghostty-Based Terminal for macOS 26

#terminal #ghostty #devtools

6 min read

Yuuichi Eguchi

Mar 4

d3motap3 — A Multi-Source Video Recorder for macOS That Captures Phone + PC Screens Simultaneously

#opensource #rust #electron

2 min read

Yuuichi Eguchi

Feb 22

Approve Claude Code Permission Requests from Your Phone

#claudecode #vibecoding #ai

2 min read

Yuuichi Eguchi

Feb 8

Constela: Built-in a11y Checks, Plugin System & CSS Transitions

#constela #json #webdev #typescript

2 min read

Yuuichi Eguchi

Feb 7

Constela New Features - Islands Architecture, Realtime Features, and New UI Components

#constela #json #webdev #typescript

3 min read

Yuuichi Eguchi

Jan 27

Introducing AI-Powered UI Generation for Constela

#webdev #json #constela #typescript

3 min read

Yuuichi Eguchi

Jan 25

Introducing @constela/ui - Copy-Paste UI Components for Constela JSON DSL

#webdev #typescript #json #constela

3 min read

Yuuichi Eguchi

Jan 24

Constela: Call, Lambda, and Array Expressions for Type-Safe Data Operations

#webdev #typescript #constea #javascript

6 min read

Yuuichi Eguchi

Jan 24

Introducing the Constela VSCode Extension - Build UIs with JSON

#vscode #webdev #json #constela

2 min read

Yuuichi Eguchi

Jan 21

Introducing create-constela: Bootstrap Constela Projects in Seconds

#constela #webdev #javascript #typescript

2 min read

Yuuichi Eguchi

Jan 20

Constela: Built-in SEO Features for JSON-Driven UI

#webdev #typescript #constela #json

2 min read

Yuuichi Eguchi

Jan 18

Edit JSON, See Changes Instantly: HMR in Constela

#constela #webdev #programming #typescript

3 min read

Yuuichi Eguchi

Jan 18

Constela : Achieving React/Next.js-Level Expressiveness with Timers, Forms, Portals & More

#constela #webdev #typescript #json

3 min read

Yuuichi Eguchi

Jan 17

Constela: New Features for Building Efficient SNS-like UIs

#webdev #programming #typescript #react

5 min read

Yuuichi Eguchi

Jan 15

@constela/server v4.1.0: SSR Style Evaluation Support

#javascript #typescript #webdev #json

2 min read

Yuuichi Eguchi

Jan 13

Constela v0.8.0: 5 New Features for AI-Powered UI Development

#javascript #webdev #json #typescript

4 min read

Yuuichi Eguchi

Jan 11

Constela - Building UI Without Writing JavaScript: The JSON DSL Alternative

#webdev #typescript #react #nextjs

5 min read

Yuuichi Eguchi

Jan 3

Constela: A Compiler-First UI Language for AI-Generated Interfaces

#webdev #programming #ai #javascript

3 min read

Yuuichi Eguchi

Jan 1

CapsuleRSC: Safe Server/Client Boundary Enforcement for React Server Components

#webdev #programming #react #reactjsdevelopment

2 min read

Yuuichi Eguchi

Dec 19 '25

CodeSensei — Learning to Design and Review Code in the Age of AI

#softwareengineering #learning #ai #webdev

2 min read

Yuuichi Eguchi

Dec 6 '25

I Built a Virtual Pet Game Where You Raise an AI

#webdev #gamedev

1 min read

Yuuichi Eguchi

Dec 5 '25

Building a Timezone Converter: Understanding Cross-Timezone Communication

#webdev #javascript

3 min read

Yuuichi Eguchi

Dec 3 '25

I built two high-performance Python libraries for production AI: LLM log analytics and vector similarity search

#python #llm #pybind11 #machinelearning

5 min read

Yuuichi Eguchi

Dec 1 '25

I Built a Library to Stop Writing Data Cleaning Code

#python #pandas #dataframe #datascience

5 min read

Yuuichi Eguchi

Nov 30 '25

Type-Safe LLM Outputs: Why I Built pydantic-llm-io

#python #llm #openapi #pydantic

4 min read

Yuuichi Eguchi

Nov 30 '25

How to Publish a Python Package to PyPI

#python #opensource #fastapi #websocket

4 min read

DEV Community

Yuuichi Eguchi

Badges

1 Week Community Wellness Streak

Writing Debut

Skills/Languages

Seven rounds of AI code review in one day, 2,048 tests green, and the feature had never started once

Want to connect with Yuuichi Eguchi?

What were my AI-written UI tests actually proving? Green XCUITests over a broken macOS terminal

What six coding-agent CLIs actually expose: hooks, permissions, subagents, and MCP config compared

What it takes to embed libghostty in a Swift app: six months of lessons

Calyx vs cmux: Choosing the Right Ghostty-Based Terminal for macOS 26

d3motap3 — A Multi-Source Video Recorder for macOS That Captures Phone + PC Screens Simultaneously

Approve Claude Code Permission Requests from Your Phone

Constela: Built-in a11y Checks, Plugin System & CSS Transitions

Constela New Features - Islands Architecture, Realtime Features, and New UI Components

Introducing AI-Powered UI Generation for Constela

Introducing @constela/ui - Copy-Paste UI Components for Constela JSON DSL

Constela: Call, Lambda, and Array Expressions for Type-Safe Data Operations

Introducing the Constela VSCode Extension - Build UIs with JSON

Introducing create-constela: Bootstrap Constela Projects in Seconds

Constela: Built-in SEO Features for JSON-Driven UI

Edit JSON, See Changes Instantly: HMR in Constela

Constela : Achieving React/Next.js-Level Expressiveness with Timers, Forms, Portals & More

Constela: New Features for Building Efficient SNS-like UIs

@constela/server v4.1.0: SSR Style Evaluation Support

Constela v0.8.0: 5 New Features for AI-Powered UI Development

Constela - Building UI Without Writing JavaScript: The JSON DSL Alternative

Constela: A Compiler-First UI Language for AI-Generated Interfaces

CapsuleRSC: Safe Server/Client Boundary Enforcement for React Server Components

CodeSensei — Learning to Design and Review Code in the Age of AI

I Built a Virtual Pet Game Where You Raise an AI

Building a Timezone Converter: Understanding Cross-Timezone Communication

I built two high-performance Python libraries for production AI: LLM log analytics and vector similarity search

I Built a Library to Stop Writing Data Cleaning Code

Type-Safe LLM Outputs: Why I Built pydantic-llm-io

How to Publish a Python Package to PyPI