Twenty years in product. Now I build AI products myself.

Product

Requirements first, code second

Voice Legacy is the only customer on my roadmap, but I PM it the way I would PM a team's product. I run weekly priority reviews, I take customer-discovery calls when a decision is stuck, and I write requirements for any non-trivial feature. Working solo means no one else pushes back on a bad idea. The discipline matters more, not less.

Development

VS Code when editing, Claude Code when shipping

I describe what needs to exist, I review what comes back, and I make the architectural calls. Claude handles the syntax. Most of my actual typing happens in pull request reviews, not in source files. The Voice Legacy stack runs 60+ database migrations, pgvector for semantic retrieval, Firebase auth, Stripe with webhook handling, AES-256 encryption for sensitive data, prompt caching, and per-task model routing across Opus, Sonnet, and Haiku.

I have done about 650 commits in 7 months, all solo. I wrote requirements for most of my career. Now I write the code too.

QA & evals

A 100-point rubric, an LLM judge, and four cron jobs

I built a custom evaluation system for the AI agents. It runs persona-based scenarios across diverse user profiles. It scores each run on a 100-point rubric across nine dimensions. An LLM judge grades narrative quality, and a separate check verifies voice authenticity per persona. A full eval run takes 15 to 30 minutes and costs about $1, or 45 to 60 minutes and $5 if I run it on Opus.

Daily 5:00 code review·Daily 6:00 security audit·Weekly and on release Playwright E2E·Every release eval suite

Data · analytics

Instrument first, decide second

Every meaningful user action lands in PostHog. I track funnel metrics, retention cohorts, and feature adoption. I validate dashboards against raw rows before I trust them, then I make decisions off the numbers instead of off vibes. The same cron pipeline that runs daily code review also surfaces usage anomalies like slow queries, unusual error rates, and suspicious cancellation patterns. Working solo means I am both the analyst and the audience.

Design

A rigidly templated component system that doesn't need Figma

The design happens in code. When I lay out a page, I call components by name from the library, and the interaction patterns, spacing, color tokens, responsive behavior, and accessibility all come along. I don't re-decide them per page. When I need a new component, I describe it to Claude, I tweak the output, and I add it to the library so the next page inherits it too.

Marketing

A voice-trained content pipeline that sounds like me

My pipeline runs: Sanity CMS → n8n (self-hosted) → henry-ify voice transform → Publer → Twitter, LinkedIn, and Facebook. I trained the voice model on 40+ samples of my own writing, including Substack posts, emails, and even Reddit comments. The output sounds like me instead of corporate AI slop.

Total marketing infrastructure cost is $21 a month plus the time to set it up.

Finance · billing

About $200 a month covers all the back office

Stripe handles customer creation on signup, the Free and Pro subscription tiers, the 14-day trial support, and webhook handling for subscription events. Wave is free and does the bookkeeping. Mercury is the bank.

Anthropic $50 to $200·OpenAI $20 to $50·Render $7 to $25·Publer $21·Neon, Vercel, and Firebase on free tiers·Total around $100 to $300 per month

Support

Claudia Control Plane triages, I handle the rest

In-app feedback triggers an email that lands in Claudia Control Plane, my own Claude Code agent harness running on a Mac mini at home. It monitors the feedback, triages issues, and responds or escalates as needed. The complex stuff comes to me at henry@voicelegacy.app.