Hello, I'm Sebastian Raschka, PhD
I am an LLM Research Engineer with over a decade of experience in artificial intelligence. My work bridges academia and industry, including roles as senior engineer at Lightning AI and as a statistics professor at the University of Wisconsin-Madison.
I am also the author of Build a Large Language Model (From Scratch).
My expertise lies in LLM research and the development of high-performance AI systems, with a deep focus on practical, code-driven implementations. (For my most up-to-date CV details, please visit my LinkedIn profile.)
Recent Articles and Notes
Aug 22, 2026
A 48-minute video walkthrough of token sampling, watermark detection, and removal
Aug 15, 2026
An End-to-End Project With Dataset Construction, Model Training, Local Deployment, and RLVR
Jul 18, 2026
How LLMs Learn Low-, Medium-, and High-Effort Reasoning Modes
Jun 27, 2026
Using Open-Weight Models in Local Coding Harnesses as an Alternative to Claude Code and Codex Subscriptions
A short video on how conventional LLMs relate to reasoning models and agents, along with Python and PyTorch setup using uv.
Two free live book club Q&A sessions on September 3 about Build a Reasoning Model From Scratch and related reader questions.
Architecture note on GLM-5.3-Flash, formerly Ox Alpha, covering its KDA and MLA/DSA hybrid attention, sparse MoE backbone, and four-strea...
Short illustration of how Claude's text watermarking is supposed to work based on Anthropic's released materials.
Short note on the Amazon availability of Build a Reasoning Model From Scratch and a warning about counterfeit black-and-white copies sold...