https://stefan.onl https://stefan.onl/work https://stefan.onl/lead-to-delivery https://stefan.onl/case-studies https://stefan.onl/case-studies/internal-agency-operations-workspace https://stefan.onl/case-studies/self-hosted-multi-model-ocr-vl-document-preprocessing-pipeline https://stefan.onl/case-studies/four-thousand-link-web-data-extraction-pipeline https://stefan.onl/case-studies/agentic-rag-system-for-hierarchical-documents https://stefan.onl/case-studies/ai-analytics-chatbot-combining-sql-aggregations-and-vector-retrieval https://stefan.onl/case-studies/ai-systems-workshop-for-startup-founders