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cpchen591

Pynel

@cpchen591

AI Agent Builder and LLM Evaluation Expert

China
English, Chinese
About me
I help businesses build, test, and improve AI-powered applications. With experience in AI Agent development, LLM evaluation, and software QA, I bridge the gap between AI technology and product quality. My expertise includes: • AI Agent workflows, RAG, and MCP • LLM output evaluation and prompt optimization • AI chatbot and conversational AI testing • Web, mobile, and IoT application testing • Test automation, bug analysis, and quality improvement I focus on finding hidden issues, improving AI reliability, and delivering clear insights that help teams build better products.... Read more

Skills

c
cpchen591
Pynel
Offline • 
Average response time: 1 hour

See my services

Software Testing
I will evaluate ai outputs and test your ai applications
From$30 / projectMore details
AI Implementation & Deployment
I will build ai agents with rag and automation workflows
From$70 / projectMore details

Work experience

Freelancer.com

AI Agent Developer

Freelancer.com • Freelance

Jan 2026 - Jul 2026 • 6 mos

• Designed and built a reusable LLM Agent framework for enterprise knowledge Q&A and workflow automation. • Implemented multi-agent collaboration using a Plan & Execute architecture inspired by LangGraph. • Built RAG pipelines with query rewriting, hybrid retrieval (Vector + BM25), and reranking to improve retrieval accuracy. • Designed shared state management, checkpointing, and memory systems for complex multi-step workflows. • Integrated MCP-based tool calling with multi-layer error handling to improve execution reliability.