Nils Matteson: Writing https://nilsmatteson.com/writing Engineering notes by Nils Matteson on systems and applied ML. en-us Building a Real-Time Bus Prediction System for Madison Metro https://nilsmatteson.com/writing/madison-bus-eta https://nilsmatteson.com/writing/madison-bus-eta Wed, 04 Mar 2026 00:00:00 GMT Live ML that corrects the transit API's ETAs with a 47-feature XGBoost model and Mondrian conformal prediction, retrained nightly behind a hard deploy gate. Deploying RAG in AWS Bedrock: Benchmarking 9 LLMs on the WattBot Challenge https://nilsmatteson.com/writing/wattbot-rag https://nilsmatteson.com/writing/wattbot-rag Tue, 17 Feb 2026 00:00:00 GMT Ensemble majority voting beat every individual model. The highest-citation model finished last. A serverless RAG pipeline on Bedrock with full cost tracking. Building a Speculative Decoding Engine from Scratch https://nilsmatteson.com/writing/project-gorgon https://nilsmatteson.com/writing/project-gorgon Thu, 12 Feb 2026 00:00:00 GMT Custom Triton kernels, tree-structured attention, four bugs, and an honest negative result: 0.66x baseline. The full arc from 0.08x to 0.66x and what it taught me.