AntJanusAntonin Januska
Int. Close-up — DayReel 05
Antonin Januska, face portrait against greenery

About · Staff Software Engineer

Hi, I'm Antonin.

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

Boulder, Colorado2011 — present

Summary

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
20+

Years building

2012

Blogging since

600+

GitHub stars

SC. 01Principles

Rules I work by

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

SC. 02Beyond 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.

SC. 03Capabilities

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

SC. 04Evidence

Selected work

  1. 01cc-dashTypeScript · Model Context Protocol
  2. 02SkillboxClaude Code · Agent tooling
  3. 03Agent CompilerCLI that embeds agent skills into CLAUDE.md and fails CI when the embedded content drifts.
  4. 04Using Git Worktrees to Parallelize AI AgentsWriting
  5. 0517 Side Projects I Built With Claude Code in Two MonthsWriting
  6. 06Programmer's Proverbs680 stars

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

Get in touch →