AntJanus · Case FilesBoulder, Colorado · Est. 2012File 005 · Personnel
Full StackAntonin
Portrait of Antonin Januska against greenery
Personnel photo

Personnel file · Staff Software Engineer

Cleared

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

Rules of the trade

Principles

  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.

See the proverbs project →

Beyond code

The rest of the operating system

Antonin hiking in Colorado
Surveillance, Colorado trail
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.

Skills on record

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.

Skill group

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

Skill group

Languages

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

PythonTypeScriptSQL

Skill group

Platforms & Tools

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

FastAPIRedisPostgresSQLiteKubernetes on AzureReact & Next.jsSvelteKit

Skill group

Leadership

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

Technical StrategyEngineering StandardsCross-Team DeliveryCode ReviewMentoring

Next move

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

Get in touch →

Proof on file

Selected work

EX-1cc-dashTypeScript · Model Context Protocol
EX-2SkillboxClaude Code · Agent tooling
EX-3Agent CompilerCLI that embeds agent skills into CLAUDE.md and fails CI when the embedded content drifts.
EX-4Using Git Worktrees to Parallelize AI AgentsWriting
EX-517 Side Projects I Built With Claude Code in Two MonthsWriting
EX-6Programmer's Proverbs680 stars