John Breen

I'm John Breen, Digital Product Lead at Nightingale, focused on AI solutions. I translate business problems into working AI systems, from stakeholder discovery to prompt and workflow engineering to production.

What I do

AI Solution Design & Architecture

Prompt Engineering & Agentic Workflows

Digital Product Management

Client Discovery & Stakeholder Alignment

Rapid Prototyping with LLMs and APIs

Tools I use

Top 5 tools

The ones I reach for most, across recent work.

96

Figma

90

Claude

82

Next.js

74

Vercel

62

Shopify

Figma

Figma

Claude

Claude

Visual Studio Code

Visual Studio Code

GitHub

GitHub

Next.js

Next.js

React

React

TypeScript

TypeScript

Swift

Swift

shadcn/ui

shadcn/ui

Vercel

Vercel

AWS

AWS

Convex

Convex

Supabase

Supabase

PostgreSQL

PostgreSQL

MongoDB

MongoDB

Redis

Redis

Clerk

Clerk

Resend

Resend

PostHog

PostHog

Docker

Docker

Shopify

Shopify

Spotify

Spotify

Apple Music

Apple Music

Python

Python

Google

Google

Monday.com

Monday.com

Portrait

Recent work

Digital Product Lead at Nightingale — Sep 2025–Present

NHL Cap Management Software, contracted by Utah Mammoth — Feb 2025–Aug 2025

CEO of Fantasy Roundup (acquired) — Oct 2023–Jan 2025

Associate Experience Designer at Konrad Group — Apr 2023–Sep 2023

User Experience Designer at HotStreak Fantasy Sports — Apr 2021–Aug 2021

Co-founder of 9021, blockchain solutions (acquired) — 2019–2021