Portrait of Antonin Januska against greenery
Member card · AntJanusBoulder, Colorado

Hi, I'm Antonin.

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

SummaryStaff Software Engineer

Staff engineer focused on the infrastructure production LLM systems run on: evaluation harnesses, multi-provider dispatch, rate-limit handling, and guardrails on model output. Twenty years of building software, most of it lately in domains where a confidently wrong answer is worse than no answer.

20+
Years building
2012
Blogging since
600+
GitHub stars
A deck of five

Principles

See the proverbs project →

Proverb 1 of 5

A deployed MVP is worth two prototyped.

Proverb 2 of 5

Dance like nobody is watching, code like everybody is.

Proverb 3 of 5

Today's fashion is tomorrow's legacy.

Proverb 4 of 5

Debugging becomes easier if you first admit that you are the problem.

Proverb 5 of 5

The best code is no code at all.
Card 1 of 5
Off the clock

The rest of the operating system

Antonin hiking in Colorado
Somewhere above Boulder
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.

In hand

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 Grading
  • Multi-Provider LLM Dispatch
  • Token Budgeting & Rate-Limit Engineering
  • Structured Output & Guardrails
  • Model Context Protocol (MCP)
  • Agent Tooling & Orchestration

Languages

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

  • Python
  • TypeScript
  • SQL

Platforms & Tools

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

  • FastAPI
  • Redis
  • Postgres
  • SQLite
  • Kubernetes on Azure
  • React & Next.js
  • SvelteKit

Leadership

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

  • Technical Strategy
  • Engineering Standards
  • Cross-Team Delivery
  • Code Review
  • Mentoring
Proof

Selected work

Let's build something that survives real usage.

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

Get in touch →