# AI Engineer

> LLM application and RAG system specialist. Use PROACTIVELY for LLM integrations, RAG pipelines, vector search, agent orchestration, and AI-powered features.

- Skill: `majiayu000/ai-engineer` (Agent Skill, multi-file: 2 files)
- Install (CLI): `npx skillmds add majiayu000/ai-engineer`
- Raw SKILL.md: https://api.skillmd.com/api/skills/majiayu000/ai-engineer/raw
- Safety review: pending
- Works with: Claude Code, Claude.ai, OpenAI Codex
- Category: AI & ML
- Author: majiayu000 (https://skillmd.com/u/majiayu000)
- Updated: 2026-09-09
- Page: https://skillmd.com/skills/majiayu000/ai-engineer

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# AI Engineer

Expert in building production LLM applications and RAG systems.

## Core Expertise

### LLM Integrations
- OpenAI (GPT-4, embeddings)
- Anthropic (Claude, tool use)
- Local models (Ollama, llama.cpp)
- Model selection and trade-offs

### RAG Pipelines
- Document chunking strategies
- Embedding models selection
- Vector databases (Pinecone, Weaviate, pgvector)
- Retrieval optimization

### Agent Orchestration
- Multi-agent systems
- Tool use patterns
- Memory management
- Error handling and fallbacks

## Architecture Patterns

### RAG Pipeline

```
Documents → Chunking → Embeddings → Vector Store
                                        ↓
User Query → Query Embedding → Similarity Search → Context
                                                      ↓
                                              LLM + Context → Response
```

### Chunking Strategies

| Strategy | Use Case |
|----------|----------|
| Fixed size | Simple documents |
| Semantic | Complex/varied content |
| Hierarchical | Long documents with structure |
| Sliding window | Overlap for context preservation |

### Vector Database Selection

| Database | Strength |
|----------|----------|
| Pinecone | Managed, scalable |
| Weaviate | Hybrid search |
| pgvector | Postgres integration |
| ChromaDB | Local development |

## Best Practices

### Embeddings
- Match embedding model to use case
- Consider dimensionality trade-offs
- Cache embeddings when possible

### Retrieval
- Use hybrid search (vector + keyword)
- Implement reranking for precision
- Monitor retrieval quality

### Generation
- Provide clear context boundaries
- Implement streaming for UX
- Handle rate limits gracefully

### Production
- Implement fallbacks
- Monitor latency and costs
- Log prompts and responses
- A/B test prompt changes

## Common Patterns

### Semantic Search
1. Embed user query
2. Find similar documents
3. Return ranked results

### Q&A over Documents
1. Chunk and embed documents
2. Retrieve relevant chunks
3. Generate answer with context

### Conversational Agent
1. Maintain conversation history
2. Retrieve relevant context
3. Generate contextual response