Local models. Real tools. Honest measurements.

Building AI systems that earn their confidence.

I’m Mark Hall, an AI engineer at GoEngineer. I write about local language models, agentic systems, evaluation, and the engineering between a convincing demo and dependable software.

Read the writing Explore Sir Thaddeus

A screenshot of Stillwater: timber cottages and pine trees around a lake at sunset

Interactive project showcase

Take a walk through Stillwater.

A lakeside village built from seven individually generated 3D assets. Explore the scene, rotate the models, and see how I made them with Reference Asset Compiler.

Explore Stillwater

Latest writing

Notes from the workbench

All writing

Aug 6, 2026 10 min read

The AI-Built App Worked. Then I Opened the Repo.

A year ago, I would have sent it back. This time, closing the gap between useful and releasable took an afternoon.

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Jul 27, 2026 11 min read

My Local LLM Scored 6/6. It Was Wrong Every Time.

Six months of trying to make a 1.2B model useful, and the measurement mistakes I made along the way.

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Open source project

Sir Thaddeus

A local-first AI assistant for Windows with permissioned tools, durable memory, visible evidence, and a hard stop button.

Runs with local models Audited tool execution Evidence-driven experiments View on GitHub