apps
a selection of apps, tools, and books i’ve built and shipped over the years.
Certify
2025 · CLI + VSCode · Go · Open Source
Code trust, with an expiration date.
Certify continuously evaluates every code unit in your repository, scores it against versioned policies, and assigns time-bound certification you can actually trust. CI tells you whether code passes right now — Certify tells you whether code should still be trusted.
Instead of treating quality as a one-time event, Certify makes it a continuous process of trust, verification, and renewal. Scores expire intentionally, forcing re-evaluation against current standards as codebases evolve.
- 9-dimension scoring — correctness, maintainability, readability, testability, security, architectural fitness, operational quality, performance, change risk
- AI-powered analysis — pluggable provider system supporting OpenAI, Anthropic, Ollama, Azure, and custom endpoints
- VSCode extension — CodeLens grade annotations, interactive dashboard, tree view sidebar, AI provider configurator with model discovery
- CI integration — GitHub Actions workflow with advisory and enforcing modes
- Self-certifying — Certify runs on itself, maintaining an A- (91.7%) across 50 code units
Documentation → · GitHub → · VSCode Extension →
Biorhythm Guide
2025 · iOS (iPad/iPhone) · SwiftUI + AWS
A personal rhythm and daily cycle explorer using biorhythm theory — mapping natural patterns in your physical, emotional, and intellectual energy.
Enter your birthdate and the app calculates your unique biorhythm cycles using sine wave formulas. Track your highs, lows, and critical phases across three core cycles:
- Physical (23 days) — energy, strength, coordination
- Emotional (28 days) — mood, empathy, sensitivity
- Intellectual (33 days) — focus, learning, clarity
Plus composite cycles like Passion, Wisdom, and Mastery, and extended cycles for Intuitive, Aesthetic, and Spiritual dimensions. Includes AI-generated daily Cycle Summaries with personalized guidance for work and relationships.
Book Tools
2025 · CLI + Docker + GitHub Actions · Shell · Open Source
A complete open-source toolkit for writing and publishing books from Markdown. Write in plain text, push to GitHub, and get beautifully formatted books in PDF, EPUB, MOBI, HTML, and DOCX — automatically.
The suite is three projects that work together:
- book-tools — the core CLI and build scripts. Handles chapter management, multi-language support, format conversion via Pandoc, and smart incremental builds. Install with a single
curlcommand. - book-template — a GitHub template repo. Click “Use this template,” start writing in Markdown, and the included GitHub Actions workflow builds and releases your book automatically.
- book-builder — the Docker image with all dependencies (Pandoc, LaTeX, Calibre, Kindlegen) pre-installed for consistent builds everywhere.
I dogfood these tools for my own books (below) and used them to build Certify’s documentation. The philosophy is simple: write, push, forget — the system handles the rest.
book-tools → · book-template → · book-builder →
Rise & Code
2025 · Free Book (in development) · English + Spanish
A free, open-source book teaching programming concepts without requiring a computer — designed for all ages and accessibility levels.
Using “the notebook method,” learners use pen and paper as their computer — creating algorithms for everyday tasks, tracking variables through visual representations, and designing flowcharts to map program execution. The book covers computational thinking, algorithmic reasoning, and fundamental programming concepts across 12 chapters, from variables and loops to data structures and real-world problem solving.
Available in English and Spanish. Built with book-tools.
Read Online → · Download PDF → · GitHub →
Actual Intelligence
2025 · Free Book (in development) · English + Spanish
A practical, non-technical guide to using AI tools like ChatGPT in everyday life.
Designed for people without technical backgrounds who find AI intimidating but are curious about what it can do. Starting with ChatGPT as training wheels, the guide walks through real use cases for personal and professional life. Published by Khaos Studios.
Available in English and Spanish. Built with book-tools.
Read Online → · Download PDF → · GitHub →
Yields
2020–2022 · iOS/macOS · SwiftUI · Apple
An internal operations metrics app built at Apple, giving manufacturing teams instant access to production yield data across global facilities.
Yields put real-time production metrics — total yield, gold/silver/other breakdowns, station-level data, and trend deltas — directly in the hands of operations engineers and managers. Users could search by product code, save favorites for quick access, and drill into station-by-station breakdowns.
I was the sole developer across three major versions, responsible for the full SwiftUI app architecture, API integration with internal data services, and a DocC-powered documentation site with interactive tutorials. The architecture used a VIP (View–Interactor–Presenter) pattern combined with MVVM for scene-level state management, with dedicated Workers and Services layers for data access.
- Favorites system with Siri Shortcuts integration for quick lookups
- Product search across all device lines and assembly types (FATP, MLB)
- DRI contact lookup — one-tap access to the responsible engineer for any product line
- Automated update checks and self-service feature requests
- Full DocC documentation with 12 interactive tutorials and 128 API reference pages
Claim It!
2014–2016 · iOS + React Native · Cofounder / CTO
A giveaway platform featuring weekly and daily prize drawings. As cofounder and sole developer, I was responsible for the full stack — the iOS and React Native clients, RESTful APIs, real-time features via WebSockets, and the backend infrastructure on AWS (EC2, S3, MongoDB).
Surv
2012–2013 · iOS · Node.js + AWS
A crowdsourced surveillance camera mapping app, co-developed with Kaza Razat. Surv combined user input and metadata to create maps with detailed descriptions of the locations and types of surveillance cameras.
The app was born from realizing how little access even law enforcement had to this kind of information. Our background in game development informed the design — a leaderboard system and unlockable features rewarded contributions, while a curated user base helped maintain data accuracy.
Surv launched as a closed beta in New York City and was featured on Mashable.
Martha Stewart CraftStudio
2011–2012 · iPad · Callaway Digital Arts
My first role as an iOS developer. I led the architecture and development of Martha Stewart’s crafting app for iPad at Callaway Digital Arts. The project pushed me deep into UIKit, Core Graphics, and Core Animation.
To support the app’s need for proprietary vector-based craft shapes, I built a companion desktop tool that converted SVG files to .plist format, which were then rendered natively via Core Graphics on the iPad.