Lei Sun — AI Engineering / Platform Engineering
I build AI engineering systems, platform tooling, developer tools, and fintech validation workflows. Say hello to Firefly, my 3D conversational avatar that follows your gaze and talks with you.
Articles (English)
- From RBAC Authentication to a Small Microservice System: Spring Cloud + Zero-Dependency JWT + CRM + Audit + BFF
- Building a Conversational 3D Avatar with React Three Fiber — Real Architecture and Deployment Lessons
- Local-First AI Contacts Assistant: Bringing the LLM into Your Address Book Without Letting Data Leave Home
- Not Trusting the Executor: Verification Architecture for a Desktop AI Workbench
- Preventing Agents from Lying at the Source: Building a RAG-Grounded PSE Multi-Agent Framework with LlamaIndex Workflow
- LangGraph PSE: Explicitly Modeling PSE Tri-role Collaboration with State Machines
- When LLMs Start Deceiving Themselves: A Multi-Agent Framework Guarding Article Credibility with Regular Expressions
- Hybrid Retrieval Architecture: When Keywords Meet Semantic Understanding
- Document as State Machine: How Agentic Souls Drives AI Software Development Workflows with Markdown
- Building a PSE Tri-Role Closed Loop with AutoGen: A Retriable, Traceable Agent Collaboration Framework