# Hoang Yell

> Senior software engineer, system architect, and technical writer based in Vietnam. Specializing in Agentic Engineering, Model Context Protocol (MCP), Local AI with Consumer Hardware, and Clean-Room Software Architecture.

Bilingual engineering platform (English & Vietnamese) providing in-depth architectural breakdowns, runnable benchmarks, and production-tested patterns for autonomous coding agents and modern system design.

## Key Navigation & Feeds
- [Home](https://hoangyell.com/): Homepage with latest articles, engineering showcases, and sister projects
- [Archives](https://hoangyell.com/archives/): Chronological index of all published engineering articles
- [Topics Hub](https://hoangyell.com/hub/): Topic catalog across AI, architecture, dev tools, and software craft
- [About](https://hoangyell.com/about/): Engineering background, architecture principles, and tech stack
- [Resume](https://hoangyell.com/resume/): Professional experience, production systems, and competencies
- [RSS Feed](https://hoangyell.com/rss.xml): Primary English syndication feed for agents and feed aggregators
- [RSS Feed (Tiếng Việt)](https://hoangyell.com/vi/rss.xml): Vietnamese syndication feed

## Flagship Guides: Agentic Engineering & MCP
- [Pi Mono: What It Is, Architecture & Composable AI Agent Guide](https://hoangyell.com/pi-mono-explained/): What is Pi Mono (badlogic/pi-mono)? Explore the composable open-source AI coding agent monorepo by Mario Zechner: unified LLM gateway, CLI, and extensions.
- [i have adhd Skill: Claude Code & Cursor Setup, 10 Rules Guide](https://hoangyell.com/i-have-adhd-coding-agent-skill/): i have adhd skill for Claude Code, Cursor and Gemini: stops agent distraction loops, injects working memory, and cuts token bloat by 60% for ADHD developers.
- [GitNexus: What Is It? MCP Codebase Graph for AI Agents (Cursor & Claude)](https://hoangyell.com/gitnexus-explained/): What is GitNexus? Index any codebase into KùzuDB via 7 MCP tools - stop AI agents breaking refactors with blast-radius queries before they edit code.
- [Massive Collection of System Prompts for Different AI Models: 700 Items List](https://hoangyell.com/system-prompts-ai-tools-leaked-explained/): Browse the massive collection of system prompts for different ai models (list of 700 items) on GitHub: Cursor, Manus, Windsurf, Devin, and Claude Code prompts.
- [OmniRoute: Complete Local AI Gateway Guide for 290+ LLMs & MCP](https://hoangyell.com/omniroute-explained/): What is OmniRoute? Guide to the open-source local AI gateway: multiplex 290+ LLMs, stop 429 rate limits with auto-fallback, and native MCP for Claude Code.
- [REA: Reverse Engineer Anything with AI Agents & MCP](https://hoangyell.com/rea-explained/): REA (morluto/rea) connects AI coding agents via MCP to Ghidra, Hopper, and ASAR to reverse engineer binaries and Electron apps into verifiable code.

## System Design & Software Architecture
- [System Design Primer Explained: The Architecture Bible for Scaling Systems](https://hoangyell.com/system-design-primer-explained/): Deconstructing Donne Martin's System Design Primer: the architectural blueprint for distributed systems, core trade-offs, and scaling to millions of users.
- [Matt Pocock Skills Explained: Engineering Discipline Over Vibe Coding](https://hoangyell.com/matt-pocock-skills-explained/): How Matt Pocock's skills framework enforces Ousterhout deep modules, Socratic grilling, and tracer-bullet tickets to cure the AI vibe coding hangover.

## Sister Projects & Open Source
- [Astro Gallery](https://gallery.hoangyell.com/): Open-source zero-layout-shift image gallery component for Astro
- [Yellorn](https://yellorn.com/): Browser-based data doctor, fast webhook studio, and JSON tools
- [Markdy](https://markdy.com/): Lightweight diagrams-as-code DSL animating interactive scenes inside Markdown
- [AI Chat Sandbox](https://chat.hoangyell.com/): Web-based conversational playground for testing local and cloud LLMs

## Tiếng Việt (Vietnamese Flagship Posts)
- [Pi Mono Giải Thích: Anti-Framework Cho AI Coding Agent](https://hoangyell.com/vi/pi-mono-explained/): Pi Mono là gì? Phân tích monorepo mã nguồn mở của Mario Zechner (badlogic/pi-mono): bộ khung modular tự build AI coding agent với TypeScript extensions.
- [i have adhd Claude Skill: 10 Quy Tắc Triệt Tiêu AI Văn Mẫu](https://hoangyell.com/vi/i-have-adhd-coding-agent-skill/): i have adhd Claude skill là gì? Trọn bộ 10 quy tắc chống AI văn mẫu cho Claude Code và Cursor: đưa lệnh lên đầu, bỏ rào đón và tiết kiệm 60% token context.
- [GitNexus Là Gì? MCP Codebase Graph Cho AI Agent (Cursor & Claude)](https://hoangyell.com/vi/gitnexus-explained/): GitNexus là gì? Index codebase vào KùzuDB qua 7 MCP tools - ngăn AI agent phá vỡ code khi refactor bằng truy vấn blast-radius trước khi sửa đổi.
- [Bộ Sưu Tập 700+ System Prompt Cho Các Model AI: Danh Sách & Mã Nguồn](https://hoangyell.com/vi/system-prompts-ai-tools-leaked-explained/): Tổng hợp danh sách 700+ system prompt mã nguồn mở cho các mô hình AI trên GitHub: Cursor, Manus, Windsurf, Devin và Claude Code kèm tệp JSON tải về.
- [OmniRoute Là Gì: Cổng AI Gateway Cục Bộ 290+ LLM & Local MCP](https://hoangyell.com/vi/omniroute-explained/): OmniRoute là gì? Hướng dẫn AI gateway chạy local: gom 290+ LLM sau 1 URL, tự động fallback khi dính lỗi HTTP 429, nén token 35% và tích hợp MCP cho Claude Code.
- [System Design Primer: Bản Thiết Kế Sống Còn Cho Hệ Thống Triệu Người Dùng](https://hoangyell.com/vi/system-design-primer-explained/): Giải mã System Design Primer của Donne Martin: bộ khung kiến trúc phân tán, các định lý đánh đổi và lộ trình thiết kế hệ thống hàng triệu người dùng.

## Plain Text Markdown Endpoints
Each article is also available as clean plain text Markdown with YAML frontmatter by appending `.md` to the path:
- English: `https://hoangyell.com/[slug].md` (e.g. [Pi Mono Markdown](https://hoangyell.com/pi-mono-explained.md))
- Tiếng Việt: `https://hoangyell.com/vi/[slug].md` (e.g. [Pi Mono Markdown VI](https://hoangyell.com/vi/pi-mono-explained.md))

## Full Documentation & Extended Catalog
- [Full LLM Context Catalog](https://hoangyell.com/llms-full.txt): Comprehensive index of all 354 published articles across English and Vietnamese