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Roxin-ChaI/README.md

Hi, I'm Yixin 👋

Software Engineer building AI Agents and production-oriented LLM applications.

📍 Xi'an · 💼 AI Agent / LLM Application Engineering

Python LangGraph LangChain FastAPI PostgreSQL Redis Docker

Agent Systems · RAG · Context Engineering · AI Infrastructure

I spent the past several years turning simulation and machine-learning data into practical software—from Qt desktop systems and model-training interfaces to reliable data applications.

Today I am channeling that engineering foundation into AI agents and open-source developer tools, approaching AI as a disciplined apprentice: learning in public, testing assumptions, and building small systems that earn trust through evidence.

🚀 Projects

  • 🤖 Production Knowledge Research Agent — Production-oriented research agent with LangGraph, hybrid RAG, grounding, evaluation, reliability, and observability.

  • 🔎 Web Research Agent — Lightweight LangChain agent that autonomously uses web search through tool calling.

  • 🧠 Context Window Compressor — Framework-agnostic context engineering library for managing LLM Agent history under token constraints.

  • 🔍 AI GitHub Reviewer — Read-only AI Pull Request reviewer with bounded tool calling and deterministic output validation.

  • ⚙️ Prompt Vault API — FastAPI backend demonstrating persistence, migrations, Docker, testing, and CI.

Connect

Portfolio Email

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  1. production-knowledge-research-agent production-knowledge-research-agent Public

    Production-oriented single-agent knowledge research system with DeepSeek V4 Flash, hybrid RAG, pgvector, Web Search, evidence grounding, evaluation, reliability, and real E2E validation.

    Python

  2. web-research-agent web-research-agent Public

    A lightweight single-agent web research system using DeepSeek V4 Flash, Tool Calling, ReAct orchestration, and DDGS web search.

    Python

  3. context-window-compressor context-window-compressor Public

    A reusable Python library for LLM context compression, token budgeting, and context-window management.

    Python

  4. ai-github-reviewer ai-github-reviewer Public

    A read-only AI agent that reviews public GitHub pull requests.

    Python

  5. prompt-vault-api prompt-vault-api Public

    A REST API for managing reusable prompts with FastAPI, SQLite, Alembic, Docker, and GitHub Actions.

    Python

  6. prompt-vault-agent prompt-vault-agent Public

    A DeepSeek-powered single-agent CLI that uses natural-language tool calling to search prompts through the Prompt Vault API.

    Python