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01 / Proof manual

The work, with the claims attached.

Start with three products you can open. Then inspect the employer outcomes, where I name my role and keep the work unlinked because it is not mine to demo.

02 / Open these

Built and shipped in public

Solo build — live — open source

ThinkHaven

The problem, in one line

An independent consultant has a hunch and a deadline, and no cheap way to find out whether the hunch survives contact with a hard question.

What I built

A decision accelerator that grills your plan the way a good advisor would, then hands back a shareable decision record. Anti-sycophancy is a design constraint, not a setting: a board of distinct lenses argues with you rather than agreeing.

Key decision

The artifact is the product. Chat is the input; the shareable decision record is the work product, which is what let the whole thing run for a first-time visitor with no signup at all and turned the product into its own marketing.

Stack Next.js · Supabase · Anthropic API · open source

Screenshot — live session ThinkHaven session panel: a user proposes pivoting a B2B SaaS to mid-market, and two named advisor lenses push back with questions about unit economics.
Solo build — open source

CensusChat

The problem, in one line

Healthcare strategy teams need US Census demographics to size a market, and getting them means either learning SQL or waiting weeks on a consultant.

What I built

A natural-language interface over Census data. You ask in English and get a sortable table and a chart back in under two seconds, across all 3,144 US counties and 239,741 block groups on 84 variables, holding conversational context so the second question builds on the first.

Key decision

An MCP validation layer between the model and the database instead of trusting generated SQL: table and column allowlists, row caps, and dangerous-pattern blocking all run before anything reaches DuckDB.

Stack TypeScript · Next.js · DuckDB · PostgreSQL · Claude via the Agent SDK and MCP · v1 shipped February 2026

Architecture diagram CensusChat architecture diagram: a plain-English question passes through an MCP validation layer of allowlists, row caps and dangerous-pattern blocking before reaching DuckDB, which returns a sortable table and chart.
A diagram of the system, not a product screenshot. CensusChat has no hosted demo — the source is the artifact, and this is where the gate sits.
Co-founded — live

InstaDoc

The problem, in one line

It’s 9pm, something hurts, and you can’t tell whether this is an urgent-care trip or a ride-it-out.

What I built

An AI symptom checker that routes to a next step rather than guessing a diagnosis: self-care, go see someone today, or an async review by a real ER physician who sends back a work note or a consult. Co-founded with Jon Pangia, DO, a practicing emergency physician who owns the clinical workflow and carries the risk on every paid deliverable; I own the architecture, the eval pipeline, and the guardrails.

Key decision

A hard line at navigation with a clinician in the loop, and no crossing it: not a diagnosis, not an AI doctor, not a medical device. Every deploy is gated by a clinical eval pipeline with human physician review, because in this category the thing that kills you is being right most of the time.

Stack React · Supabase HIPAA tier · tiered-model agentic workflow

Screenshot — care paths InstaDoc care-path selector: a list of routes including a free AI symptom assessment reviewed by licensed professionals, a sick note, and an online prescription.
03 / Employer record

Built inside companies

No links here. These shipped inside employers, and the products aren’t mine to demo.

NeuroBlu Analytics

Director of Product, business-unit owner
~$10MARR

Real-world-evidence platform for mental health. Zero to ~$10M ARR. Scaled the clinical dataset from 0.5M to 46M+ patient lives and 59M+ clinical notes. Built the eval frameworks governing production GenAI across 25+ regulated clinical organizations.

Revive Market Profiler

Sr. Director, Data Products & Analytics
$1MARR

Physician-referral graph product line. Grew the line to $1M ARR, up 225% over four quarters, across 12 health-system clients.

HCA Patient Experience Dashboard

Data Product Manager
175hospitals

Enterprise patient-experience product. Deployed to 175 hospitals and 1,500 executive and nursing leaders. Cut report-development cost by $1.2M a year. Trained 200+ users.

No links by design — employer work stays unlinked.

04 / Next step

Compare the record with the role.

If the work maps to the product problem you are hiring for, the next useful step is a direct conversation.

Discuss the role Review the Production Gate kevin@kevintholland.com