Posts on Xiaolong Song https://xlsong-blog.vercel.app/posts/ Recent content in Posts on Xiaolong Song Hugo en-us Sun, 24 May 2026 10:00:00 +0200 NL Transport Pulse: an End-to-End Data Pipeline for Dutch Railway Reliability https://xlsong-blog.vercel.app/posts/nl-transport-pulse/ Sun, 24 May 2026 10:00:00 +0200 https://xlsong-blog.vercel.app/posts/nl-transport-pulse/ Terraform, Airflow, BigQuery, dbt, and Streamlit answering one question: why is my train late? Building an AI Tool for an AI Skeptic https://xlsong-blog.vercel.app/posts/ai-tool-for-an-ai-skeptic/ Mon, 06 Apr 2026 10:00:00 +0200 https://xlsong-blog.vercel.app/posts/ai-tool-for-an-ai-skeptic/ A cron pipeline, one caged LLM call, and why boring architecture won over a skeptical scientist.