Pragmatic Gen AI Top Patterns & Solutions for successful LLM-powered Applications Christian Weyer | Co-Founder & CTO | Thinktecture AG | [email protected] 1 

§ Technology catalyst § AI-powered solutions § Pragmatic end-to-end architectures § Microsoft Regional Director § Microsoft MVP for AI § Google GDE for Web AI [email protected] https://www.thinktecture.com Pragmatic Gen AI Top Patterns & Solutions for Successful LLM-Powered Applications Christian Weyer Co-Founder & CTO @ Thinktecture AG 2 

Pragmatic Gen AI Top Patterns & Solutions for Successful LLM-Powered Applications Our journey 3 Models for our software Lightweight RAG Semantic Routing Observability LLM all-the-things? Structured Output / Tool Calling 

Pragmatic Gen AI Top Patterns & Solutions for Successful LLM-Powered Applications LLM ALL-THE-THINGS? 4 

Language Models understand and generate semantically rich human language, transforming it into text or structured data for both humans and machines. ⚠ Non-deterministic: same input can lead to different outputs. Embedding Models capture semantic meaning by encoding human language into numerical vector representations, facilitating understanding, comparison, and retrieval for both humans and machines. ✅ Deterministic: same input always results in the same embedding. Pragmatic Gen AI Top Patterns & Solutions for Successful LLM-Powered Applications 5 🫱 🫲 Semantic AI Generative AI 

Pragmatic Gen AI Top Patterns & Solutions for Successful LLM-Powered Applications MODELS FOR OUR SOFTWARE 6 

§ Language & embedding models part of end-to-end architectures § E-M enable semantic search & comparison § L-M enable human language understanding via context § System prompt § Conversation history § User query Pragmatic Gen AI Top Patterns & Solutions for Successful LLM-Powered Applications API-based model integrations 7 

Pragmatic Gen AI Top Patterns & Solutions for Successful LLM-Powered Applications Classical applications & UIs 8 API-based data Document-based data 

Pragmatic Gen AI Top Patterns & Solutions for Successful LLM-Powered Applications Language-enabled “UIs” – Talk-to-TT 9 

Pragmatic Gen AI Top Patterns & Solutions for Successful LLM-Powered Applications 10 C4 system context diagram § Various tech stacks § Docker-based distributed system 

Pragmatic Gen AI Top Patterns & Solutions for Successful LLM-Powered Applications PATTERN LIGHTWEIGHT RAG [RETRIEVAL-AUGMENTED GENERATION] 11 

Pragmatic Gen AI Top Patterns & Solutions for Successful LLM-Powered Applications “Talk to your Data” Cleanup & Split Text Embedding Question Text Embedding Save Query Relevant Results Question Answ er w / sources LLM Embedding Model Embedding Model 💡 Indexing / Embedding Question Answering .md, .docx, .pdf etc. “Lorem ipsum…?” 💡 Vector DB 12 

§ Frameworks § LangChain § FastEmbed § Lightweight & efficient for generating text embeddings § Embedding model § jinaai/jina-embeddings-v2-base-de (local) – 768 dims § Vector store § PostgreSql (pgvector) vector store § LLM/SLM § Llama 3.3 70B on Cerebras (very fast) Pragmatic Gen AI Top Patterns & Solutions for Successful LLM-Powered Applications Technical implementation – Lightweight RAG 13 

Pragmatic Gen AI Top Patterns & Solutions for Successful LLM-Powered Applications PATTERN STRUCTURED OUTPUT 14 

§ Integration is being standardized with MCP Pragmatic Gen AI Top Patterns & Solutions for Successful LLM-Powered Applications Structured data from unstructured input For calling APIs / tools 15 “OK, when is my colleague CW available for a two- days workshop?” System Prompt (with employee data) + Schema / Function Calling (for structured output) (Internal) Web API Availability business logic 

§ Frameworks § Pydantic § Instructor § Methodology § Schema with JSON Mode (not Function Calling) § SLM/LLM § Llama 3.3 70B on Cerebras (very fast) Pragmatic Gen AI Top Patterns & Solutions for Successful LLM-Powered Applications Technical implementation – Structured Output 16 

Pragmatic Gen AI Top Patterns & Solutions for Successful LLM-Powered Applications PATTERN SEMANTIC ROUTING 17 

Pragmatic Gen AI Top Patterns & Solutions for Successful LLM-Powered Applications Semantics-based decisions for user interactions Guarding (e.g. prompt injection) Routing (selecting correct target) “Lorem ipsum…?” Target RAG Target API Call Target … something else … Fine-tuned Language Model Embedding Model 18 

Guarding § Frameworks § llm-guard § HuggingFace Transformers § Model § deepset/ deberta-v3-base-injection (local) Routing § Frameworks § semantic-routing § FastEmbed § Embedding model § intfloat/ multilingual-e5-large (local) – 1024 dims § Vector store § PostgreSql (pgvector) Pragmatic Gen AI Top Patterns & Solutions for Successful LLM-Powered Applications Technical implementation – Semantic Guarding & Routing 19 

Pragmatic Gen AI Top Patterns & Solutions for Successful LLM-Powered Applications PATTERN / SOLUTION OBSERVABILITY 20 

Pragmatic Gen AI Top Patterns & Solutions for Successful LLM-Powered Applications Things can get… overwhelming 21 

Pragmatic Gen AI Top Patterns & Solutions for Successful LLM-Powered Applications End-to-end tracing 22 

§ Methodology § Open Telemetry (OTel) § Frameworks § OTel Python packages § LogFire SDK § Tools § LogFire, LangFuse § Any OTel-enabled system Pragmatic Gen AI Top Patterns & Solutions for Successful LLM-Powered Applications Technical implementation - Observability 23 

Pragmatic Gen AI Top Patterns & Solutions for Successful LLM-Powered Applications END-TO-END SOLUTION ILLUSTRATED 24 

Semantic routing Pragmatic Gen AI Top Patterns & Solutions for Successful LLM-Powered Applications "Talk to your systems" - for Availability queries 25 Web App / Watch App Speech-to-Text Internal Gateway (Python FastAPI) LLM / SLM Text-to-Speech Transcribe spoken text Transcribed text Check for experts availability with text Extract { experts, booking times } from text Structured JSON data (Function calling) Generate response with availability Response Response with experts availability 🔉 Speech-to-text for response Response audio Internal Business API (node.js – veeeery old) Query Availability API Availability When is CL…? CL will be… 

Pragmatic Gen AI Top Patterns & Solutions for Successful LLM-Powered Applications Recap: Top Semantic AI patterns & solutions – in end-to-end software engineering 26 Lightweight RAG Structured Output Semantic Guarding & Routing Insightful Observability 💡 Fun Fact: Large parts been built with AI-assisted Coding / Vibe Coding 

Thank you! Christian Weyer https://thinktecture.com/christian-weyer [email protected] 27