Selected engineering work
Coding
Start with the work another engineer can inspect. The rest is ordered by strength of evidence, not by recency or stack.
Inspect first
Two tools, in public
The source, release state, and consequential engineering decisions are available to inspect.
ThreatForge
Threat models that live in the repository they describe, written as YAML you can review in a pull request.
Released v0.3.0 in July 2026 with installers for macOS on Apple Silicon and Intel, Windows via NSIS and MSI, and Linux via AppImage, deb, and rpm
Runmark
Request definitions as files in your repository, run by one engine that serves a developer's terminal and a coding agent over MCP.
Published to npm as @exit-zero-labs/runmark and open source under MIT
Current practice
The AI problem I lead now
A public-boundary essay: the product is unreleased, so the evidence is the reasoning and Microsoft's own documentation.
Customizing an AI agent that speaks in a shared room
Notes on the problem I lead at Microsoft: making Teams Facilitator configurable when everything it says is visible to every participant. About the shape of the problem, not the unreleased implementation.
Work in progress and unreleased; this page describes the problem and the method, not shipped capability
Read the public problem →Product systems
Privacy, retrieval, and operating constraints
Products whose architecture is shaped by what the system refuses to retain, expose, or guess.
Kinnections
The server stores a map of your relationships and cannot read a byte of it. Every decision in this paid, encrypted product had to survive that.
Sole author: product, cryptography design, full-stack implementation, billing and operations
- Next.js
- React 19
- TypeScript
- Web Crypto API
This portfolio
The site you are reading: two complete experiences over one corpus, where the conversational one is optional and the indexable one is not a fallback but a peer.
Sole author: product architecture, design direction, and full-stack implementation
- Astro
- React
- TypeScript
- Zod
Shipped native work
Two App Store products
Small, complete applications: scoped, built, shipped, corrected, and maintained by one person.
Split my Meal
An even split punishes whoever ordered the salad. This iOS app apportions tax and tip to what each person actually had, and keeps the meal afterwards.
Sole author: design, SwiftUI and SwiftData implementation, App Store submission
- Swift
- SwiftUI
- SwiftData
- MapKit
Estimate my Mortgage
Most mortgage calculators answer one payment. This iOS app holds several estimates side by side, because the real question is which combination you want.
Sole author: design, SwiftUI implementation, App Store submission
- Swift
- SwiftUI
- Core Data
- MapKit
Not public
A pipeline still being proved
Included for the system design, but held below public work until there is an artifact another person can inspect.
Also built
Earlier work that reached people but does not have a piece written about it. Listed without links: several are unmaintained, and a site that has drifted is worse evidence than the record of having built it.
CollabHive2025
A discovery and collaboration platform for passion projects, built as a web client and a separate API.
Judge GPT2024
A quiz that measures how well people distinguish real news from generated fake news, in four languages, collecting results as training data for misinformation detection.
Focus Timer2023
A focus timer built as an app inside Microsoft Teams.
Split my Trip2022
A web app for settling complicated shared expenses across a group trip. The idea that later became a native app.
P Sane Creations2022
An online gallery and shop for an artist's work.