Ryan Hernalsteen
AI & Data Architect · Builder · Photographer
I build production AI agents and the data underneath them. Off the clock I ship my own apps with Claude Code and shoot my daughters' games. Based in Michigan.
Currently at Perficient as Senior Solutions Architect. My Career → About me →
What I'm building All projects →
- Data 360 Tools Interactive visuals that explain Salesforce Data 360 (formerly Data Cloud): harmonization, identity resolution, activation, zero copy, and vector search.
- Reply All A text-based workplace RPG built into this site: 108 scenarios, 14 endings, and a daily run everyone plays the same day.
- Personal Health Data Warehouse Python and SQLite pulling 18 months of Apple Watch, iPhone, and medical-device data, calibrated against a clinical baseline.
- Second Brain An Obsidian vault a Claude Code skill keeps filed: raw brain dumps in, structured and linked notes out.
- Current: Recovery Score A shipped iPhone and Apple Watch app that turns Apple Health data into one daily recovery number.
Latest posts All posts →
- Oct 2026 7 min read Zero Copy Isn't Zero Cost. So What?
- Sep 2026 4 min read Data 360 Doesn't Build a Golden Record. So What?
- Sep 2026 14 min read The Use Case Lives in the Overlap
- Sep 2026 8 min read Identity Resolution in a Shoebox
- Sep 2026 9 min read Four Projects, Four Stacks, One Process
Running series: So What? One Data 360 concept at a time, and why it matters.
Photography View all →
