AntJanusStaff Engineer · AI Menu's at the bottom ↓
Portrait of Antonin against greenery
About · Boulder, Colorado

Hi, I'm Antonin.

Staff Engineer building AI-backed systems, engineering standards, and the workflows that let teams ship serious software.

Staff engineer focused on the infrastructure production LLM systems run on: evaluation harnesses, multi-provider dispatch, rate-limit handling, and guardrails on model output.

20+Years building
2012Blogging since
600+GitHub stars

Principles

Swipe through. The long list lives in the proverbs repo.

See the proverbs project →
A deployed MVP is worth two prototyped.Principle 1 of 5
Dance like nobody is watching, code like everybody is.Principle 2 of 5
Today's fashion is tomorrow's legacy.Principle 3 of 5
Debugging becomes easier if you first admit that you are the problem.Principle 4 of 5
The best code is no code at all.Principle 5 of 5

The rest of the operating system

Beyond code

Antonin hiking in Colorado

Photography

I shoot animals, landscapes, people, and street scenes. The camera is how I stay observant.

Fiction

I write AI-themed fiction and short stories when technical writing is not enough.

Podcasts & Games

I have opinions about Final Fantasy, narrative design, and the overlap between games and technology.

What I work with now

The stack changes. The throughline doesn't. I'm usually working where backend systems, product delivery, and AI workflows collide.

AI & LLM Systems

Measuring model output, routing it across providers, and trusting none of it by default.

LLM Evaluation & Judge GradingMulti-Provider LLM DispatchToken Budgeting & Rate-Limit EngineeringStructured Output & GuardrailsModel Context Protocol (MCP)Agent Tooling & Orchestration

Languages

Python on the backend, TypeScript for everything else, SQL wherever the data lives.

PythonTypeScriptSQL

Platforms & Tools

Async services on Kubernetes, databases picked per job, front ends in React or Svelte.

FastAPIRedisPostgresSQLiteKubernetes on AzureReact & Next.jsSvelteKit

Leadership

Setting technical direction and standards, then reviewing what ships against them.

Technical StrategyEngineering StandardsCross-Team DeliveryCode ReviewMentoring

Selected work

I help teams implement AI-enabled product work, sharpen engineering practices, and build systems that survive real usage.

Get in touch →

Everything else

Theme

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