Dan Levy

Field notes

Notes from where the docs run out.

AI systems, JavaScript, security, databases, and bug fixes worth remembering.

Give Your Agent a Profiler

Benchmarks say whether. Profiles say where. Agents guess the rest.

A brass inspection loupe highlights the broad orange branch of a flame graph built from layered paper.12 min readCategory Code

How to Hire an AI Engineer Without Getting Burned

Hire for the judgment that keeps showing up

A miniature steel bridge supporting three orange weights, with a measurement probe beneath its span.10 min readCategory Leadership

Auto-Tune Your LLM Judge

Measure the evaluator's variance, then rebuild its prompt from zero.

Auto-Tune Your LLM Judge9 min readCategory AI

Announcing ExploitHunter.app

An open-source security workbench that keeps scope, approvals, tools, and evidence in one project.

A silver magnifying glass reveals torn vermilion paper fibers and a metal fragment amid black paper and monochrome evidence scraps.10 min readCategory AI

Don't Fear the Model Router

Route to the best model with confidence.

A monochrome cut-out hand places a lilac parcel aboard a workboat at a fork in mustard waterways; a barge carries papers and a repair tug carries a wrench along other branches.8 min readCategory AI

Into the Breach

Reduce local-dev risk with containers, canaries, and boring limits

A torn flap and loose fragments on the outer layer of a sweeping black paper chamber, with an intact inner curl lit by warm amber light.4 min readCategory Security

Postgres Text Searching Guide 2026

The search tools already in your database, and when each one earns its keep.

A woodcut alpine landscape combines layered mountain strata, similar marked stones and one square vermilion stone at the end of a red path.9 min readCategory Code
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Fight Evils with Evals!

Benchmarks measure benchmarks. Your system needs its own measures.

An oversized burgundy paper dinner jacket hangs around an irregular pink silhouette, with a pale torn seam revealing the mismatch.6 min readCategory AI

Semantic Vector Search and Other Topics to Win Friends and Lovers

The full search landscape: exact, fuzzy, semantic, hybrid — and when to layer all of them.

A fern, an aubergine leaf, and a yellow ginkgo fan share one branching stem across torn moss, lemon, and plum paper; a striped triangular scrap sits apart.14 min readCategory Code