The face of Sean BeirnesSean BeirnesSay hello

I turn frustrationsinto features

As a user-centered systems builder, I thrive on translating chaotic systems, confusing workflows, and cluttered spreadsheets into thoughtful software. Nothing excites me more than digging beneath the surface of a system to uncover the hidden bugs, flaws, and assumptions others miss.

How I work

Beneath the surface, every time.

  1. 1

    Dig

    Sit with the people who live in the system. Watch where they sigh. That's where the work is.

  2. 2

    Uncover

    Trace the sigh to its root: the hidden bugs, flaws, and assumptions everyone else stepped around.

  3. 3

    Fix

    Build the smallest thing that removes the frustration for good. Then make it reliable.

  4. 4

    Ship

    Put it in real hands, measure it, and keep listening. Shipping the feature is just the beginning.

My journey

Four roles. Four kinds of frustration I learned to fix.

  1. 01

    Music Teacher

    Thirty kids, one hour, and a concept that doesn't land.

    Learned to break hard things into steps that stick.

    + More

    Years in classrooms taught me what makes learning work and where it breaks. I didn't just teach music; I studied how people learn, and even published peer-reviewed research on it. Every user flow I've designed since then starts there.

  2. 02

    Instructional Designer / LMS Admin

    Canvas workflows held together with copy-paste and hope.

    Scripted the chaos away: extensions, automations, clean data.

    + More

    I lived inside Canvas as both a course designer and administrator. When the platform fell short, I extended it with browser extensions, userscripts, automations, and clean data pipelines. When a search-highlighting bug was weeks from a fix, I contributed an HTML parsing algorithm to Instructure's codebase and fixed it myself.

  3. 03

    LLM Quality Analyst

    AI that sounds confident and is quietly wrong.

    Evals, prompts, and guardrails teachers can trust.

    + More

    At MagicSchool, I'm constantly improving the AI systems used by teachers around the world. A confident-and-wrong LLM is frustrating; my job is building evals, designing tool calls, and tuning prompts that give teachers reliable AI features.

  4. 04

    AI Engineering Projects

    Complex workflows nobody has time to untangle.

    Agents, RAG, and LLM tools that do the untangling.

    + More

    When I was tired of searching Canvas documentation for answers, I built a Go web scraper to feed a Python RAG data pipeline, and created an AI chatbot that gave grounded, cited answers to frequently asked Canvas questions. TypeScript, Python, Go, Postgres: I use whatever tool best solves the frustration.

AI & systems

The toolbox.

LLMs

AI SDK · OpenAI API · Anthropic API · OpenRouter

RAG

Chunking · Embeddings · Vector search · Reranking

Evaluation

Eval development · Prompt engineering · Braintrust

Agents

Guardrails · Tool calling · Multi-step workflows

  • TypeScript
  • React
  • Python
  • PostgreSQL
  • Go
  • Java
  • Next.js
  • Tailwind
  • FastAPI
  • Docker
  • Git

Contact

What's frustrating you?

Share the problem, the constraints, and what success looks like. I'll respond with next steps.