Looking for a job

Yuchen Wan

@leoycwan

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AI application engineer building RAG customer-service agents and open-source tools for AI coding agents.

China

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What I'm looking for

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

I designed and shipped a RAG customer-service agent for an online seller, turning about 70,000 historical messages into 8,445 Q&A pairs. After two weeks in shadow mode, the whitelisted rollout sent 1,467 replies to real buyers.

I also built unattended operation for the chat channel, including token lifecycle handling, a Playwright refresh daemon, QR re-login recovery, Telegram alerts, and a human-takeover state machine. The project stopped for the seller’s business reasons.

I’ve open-sourced myanyagent, crawl4ai-mcp, and current-work-grouper. I work daily with Claude Code and Codex multi-agent workflows, and write honest postmortems.

Previously, I was a dispatched Software Engineer on NCR Voyix’s POS project in Japan. I owned the cash-changer communication core, re-architected the RS-232C stack, and introduced automated testing with JUnit, Gradle, and Jenkins.

Experience

Work history, roles, and key accomplishments

Current

Independent Developer (AI applications)

Current

Self-employed

Jan 2026 - Present (8 months)

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.

Python fastAPI RAG LLM Applications AI Agents MCP Claude APIs Playwright Docker GitHub Actions

Software Engineer

YTT Technology

Jun 2025 - Dec 2025 (6 months)

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).

Java RS 232 Junit Gradle Jenkins Linux