Skip to content
Writing

Notes from the workshop.

Essays on building bespoke software, the Elixir ecosystem, and why most companies need fewer engineers than they think.

Thick impasto oil painting of thousands of pale paper sheets funneling down through narrowing amber-lit gates, most settling into quiet side pools while a bright stream condenses into a glowing indigo lattice of connected points
Featured

116,000 Papers on Leftover Tokens

The Winnow Research Atlas holds 116,439 papers. Its pipeline runs by hand off my laptop. What that taught me about deterministic filters and materialized views.

David Kerr
Thick impasto oil painting of a glowing conveyor belt carrying small bright cubes of light from a distant cold data-center skyline down toward a warm wooden workbench, heavy palette-knife strokes, no people
Post

The Frontier Comes to You

You will never catch the AI frontier. You don't have to. The efficiency of these models doubles every eight months, and last year's frontier keeps landing on your desk. The weights are everything.

David Kerr
Thick impasto oil painting of a merchant's brass balance scale on a wooden workbench, one pan stacked with rough-cut timber and the other holding a single glowing coin, warm amber and deep indigo palette-knife strokes, no people
Post

What Is a Token Worth?

Tokens are the raw material of my work, but a subscription never tells me what one is actually worth. I'm instrumenting my own plan to find out, and to see whether the line is quietly moving.

David Kerr
Thick impasto oil painting of a handcrafted wooden bow and a quiver of arrows leaning against a rough fence post in the warm amber foreground, dwarfed by a vast fortified data-center citadel glowing cold blue behind a tall sealed gate on a dark hill, heavy palette-knife strokes, no people
Post

Who the Data Centers Are For

In three weeks of June, the AI frontier stopped pretending. The most capable model went to institutions, the public got a smaller window, and the bill keeps landing on us. Here's what I'm doing about it.

David Kerr
Thick impasto oil painting of a small private server glowing warm on a wooden workbench in the foreground, a vast cold blue data-center skyline looming through the window behind it, heavy palette-knife strokes, no people
Post

Renting the Frontier

What does it cost to run your own AI coding model? I did the math. Cost is not the problem. The real risk is depending on a few vendors you can't control.

David Kerr
An artist's palette seen from above, paint divided into separate wells at different levels, some full and some nearly scraped empty
Post

Stop Burning Tokens. Start Allocating Them.

The cheap-token era is ending, but the limit that stops you is the window, not the price. Here's how to treat AI capacity like a budget you allocate.

David Kerr
A cribbage board with brass pegs and worn playing cards on a wooden table, lit by warm amber lamplight
Post

I Built a Video Game. The Domain Wasn't the Constraint.

Domain expertise used to be the moat. It isn't anymore. The three skills that replaced it, tested against a domain I had never worked in.

David Kerr
A workshop bench with two sets of plans pinned to the wall, one zoomed out and one zoomed in
Post

How to Tell If You're Using AI Well

Volume metrics lie about AI-assisted work. The signal isn't in the code, it's in whether you did the thinking before the code got written.

David Kerr
A conductor's podium with tools and blueprints scattered around it
Post

You're the Broker, Not the Builder

AI coding assistants are good enough to do the building. Your job is to be the broker between the problem and a scalable, resilient solution. Here's what that looks like in practice.

David Kerr
A small workshop with custom-built tools on a workbench
Post

The Age of Bespoke Software

Software used to be something only tech companies could justify building. That's not true anymore. If you run a business and haven't talked through which problems are solvable with software, now is the time.

David Kerr
A workbench with tools and a half-finished project
Post

Builders Build for Fun. That's How You Get Hired.

How building Winnow Labs' blog and research atlas as a passion project turned into a real partnership, and why the best thing you can do between jobs is build something.

David Kerr
A delivery robot on a suburban sidewalk approaching a front door
Post

Amazon Buys Rivr. I've Seen This Before

A former Amazon robotics engineer breaks down why the Rivr acquisition faces the same cost and scale challenges that every robotics effort at Amazon eventually hits.

David Kerr
PostgreSQL elephant and GraphQL logo side by side
Post

You Probably Don't Need GraphQL (Yet)

Most Phoenix apps don't need GraphQL. Here's how to know when PostgreSQL and Ecto are enough, and when Absinthe actually earns its complexity.

David Kerr
Abstract visualization of Elixir processes communicating like AI agents
Post

Elixir Was Built for Agentic AI (40 Years Early)

Erlang was designed for isolated processes with their own state, communicating over unreliable networks. That's exactly what agentic AI looks like.

David Kerr
Two developers collaborating as engineering partners
Post

Build Allies, Not Headcount

Engineering is a partnership, not a transaction. The companies that move fastest are the ones whose engineers actually understand the business.

David Kerr
Elixir and Phoenix logos over abstract code patterns
Post

Why I Build Everything in Elixir and Phoenix

From MVP to millions of users, Elixir and Phoenix handle it all. In the age of AI, that flexibility matters more than ever.

David Kerr
Developer working with AI coding tools at a desk
Post

I Was Wrong About AI

For a year I said AI tools only added 20% efficiency. I was measuring the wrong thing.

David Kerr
Mountain landscape in Colorado representing a new beginning
Post

Why I Started Kerrberry Systems

After 8 years building software at companies like Amazon and GridPoint, I'm starting something new.

David Kerr

Have a project in mind?

A 30-minute discovery call is the fastest way to find out if we're a fit.