# Yuchen Wan

Yuchen Wan is a remote worker on Himalayas, Independent Developer (AI applications) at Self-employed, based in China.

Source: https://himalayas.app/@leoycwan

```text
AI application engineer · shipped a RAG agent to real customers (1,467+ live replies, fail-safe gating) · Python / Java / Go · open to remote
```

| Detail | Value |
| --- | --- |
| Availability | Looking for a job |
| Location | China |
| Authorized to work in | China |
| Salary expectations | 30k+ USD |
| Job categories | AI Engineer, LLM Applications Engineer, Backend Engineer |
| Skills | AI Applications, RAG, AI Agents, Model Context Protocol (MCP), Python, fastAPI, Java, Go, TypeScript, Claude APIs, Docker, Linux, Playwright, Junit, Gradle |
| Website | https://douseful.eu.org |
| LinkedIn | https://linkedin.com/in/yuchen-wan-a6611b389 |
| GitHub | https://github.com/anyingiit |

## What I'm looking for

```text
I’m looking for a remote-first, full-time or contract role as an AI Engineer, LLM Application Engineer, or Backend Engineer.
```

## About

```text
Software engineer focused on shipping AI applications. Remote-first; based in Beijing.

- Shipped a RAG customer-service agent commissioned by an online seller — built not just to answer, but to answer safely in front of real customers: distilled 8.4k Q&A pairs from ~70k real chats, added two fail-safe confidence gates, ran it in shadow mode first, then rolled it out behind a product whitelist (6 → 15 products); 1,467+ replies were sent automatically to real buyers.
- Open-sourced tools for AI coding agents: myanyagent (short-lived, repo-scoped GitHub App tokens instead of stored PATs) and crawl4ai-mcp (a scraping MCP server that escalates from plain HTTP to headless browsers only when needed).
- Previously a dispatched software engineer on NCR Voyix's POS project in Japan: owned the cash-changer serial communication core, re-architected the RS-232C layer into transport / protocol / state machine, and introduced automated testing with JUnit, Gradle and Jenkins.

Languages: Chinese (native), Japanese (JLPT N2), English (professional reading/writing).
```

## Experience

### Independent Developer (AI applications) (current)

Self-employed. Jan 2026 - Present

```text
Designed and shipped a RAG customer-service agent for an online seller, extracting 8.4k Q&A pairs from ~70k historical messages and running it in shadow mode before rollout. Built unattended operation for the chat channel and open-sourced tools for AI coding agents.
```

Skills: Python, fastAPI, RAG, LLM-Applications, AI-Agents, MCP, Claude-APIs, Playwright, Docker, GitHub-Actions

### Software Engineer

YTT Technology. Jun 2025 - Dec 2025

```text
Dispatched to NCR Voyix: migrating 1,600+ POS terminals to an in-house Linux runtime. Owned the cash-changer comms core; split the RS-232C stack into transport/protocol/state machine, cut over in 17 days with no rollbacks; fixed an ENQ race; introduced JUnit/Gradle/Jenkins tests (79% line coverage on critical paths).
```

Skills: Java, RS-232, Junit, Gradle, Jenkins, Linux

### Software Development Intern

Beijing Xiangyue Technology. Jul 2022 - Aug 2022

```text
Set front-end conventions and migrated an Angular mobile web app to Next.js.
```

Skills: Angular, Next.js, TypeScript

## Education

### Beijing Polytechnic

Associate degree, Computer Application Technology. 2020 - 2023

```text
Associate degree in Computer Application Technology from Beijing Polytechnic, completed in 2023.
```

## Tech stack

- JaCoCo
- Jenkins
- GitHub Actions
- Next.js
- Gradle
- Python
- Java
- Go
- FastAPI
- Linux
- TypeScript
- JUnit
- Docker
- Playwright
- Model Context Protocol (MCP)
- Retrieval-Augmented Generation (RAG)

To contact Yuchen, message them from this profile with a Himalayas employer account: [Hire on Himalayas](https://himalayas.app/hire).

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