AntJanusAntonin Januska

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.

LinkedInGitHub
Portrait of Antonin against greenery
Years building
20+
Blogging since
2012
GitHub stars
600+

Principles

See the proverbs project →
  • A deployed MVP is worth two prototyped.Principle 01 / 05
  • Dance like nobody is watching, code like everybody is.Principle 02 / 05
  • Today's fashion is tomorrow's legacy.Principle 03 / 05
  • Debugging becomes easier if you first admit that you are the problem.Principle 04 / 05
  • The best code is no code at all.Principle 05 / 05

  • The proverbs project →

    680 stars and a lot of community contributions.

Antonin hiking in Colorado

Beyond code

The rest of the operating system

  • 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.

Capabilities

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

Proof, in six frames.

Work with me

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

Get in touch →