Integrative architecture & delivery — the rare part
systems · program · design
One abstraction proved by instances; a multi-repo program; AI directed as a coordinated teammate; and the design to present it all.
- Abstract systems design — unified the whole stack under one operation (the reconcile) and demonstrated it across 15+ organs: the same loop is accountability’s spine, security’s gate, provenance’s witness, and creativity’s novelty-criterion. The kind of cross-domain abstraction rarely arrived at — and harder still to ship.
- Program management — coordinated it as a multi-repo superproject under a spec → plan → build discipline: an ecosystem map and registry across ~100 logical projects, release engineering across many packages, every claim tracked to its receipt.
- AI as a coordinated engineering teammate — architected and built solo by directing multi-agent systems (parallel agents for discovery, review, and construction) at a scale and breadth one person could not otherwise reach — while keeping the architecture, the integration, and every verified claim first-party. Directing AI at this level is itself a discipline.
- Design & front-end — designed and hand-built the portfolio itself: a zero-dependency design system (semantic HTML / CSS / JS, WebGL, a live in-browser generative engine), proof-carrying and accessible — the presentation is a worked artifact, not a template. harperz9.github.io
The accountability spine — design + implementation
flagship · public
A composable stack built around one loop — perceive → gate → act → verify → witness — and the theory it implements.
- Designed EMET, an external byte/provenance witness that answers MATCH / DRIFT / UNVERIFIABLE — never trusted; proved 19/19 conformance across three independent implementations (Python · Rust · Node).
- Shipped proof-surface, a stdlib-only default-deny authorization gate with expiring least-privilege grants and delegation chains rooted in a real human; 258 tests, on PyPI.
- Shipped coherence-membrane, zero-dependency perception organs (visual · raw · region · structured · audio · caption) that emit witnessed, re-derivable observations; 868 tests, on PyPI.
- Built accountable-surface, the live loop — an MCP server with filesystem/web/command effectors, inert until authorized; 201 tests including a 39-test adversarial suite that forges digests, manufactures grants, and escapes bounds, confirming each is refused.
QuantaLang / quantac — typed-effects compiler
Rust · C backend
- Designed a language where the effects a function may perform and the lifetimes of the references it returns are part of the type and checked through to native code; lowered end-to-end through a C backend; 1002 passed / 11 ignored.
Systems, graphics & color
C++23 · D3D11 · PyPI
- Authored header-only C++23 signal/anomaly kernels — entropy, mutual information, Granger causality, PELT changepoint, FFT.
- Built RAW (Rendering Advancement Workshop) — a public real-time D3D11 rendering platform: a proxy DLL that owns the pipeline and dispatches screen-space GI, AO, and reflections (GTAO · SSGI · SSR) mid-frame. Deep reverse-engineering + graphics; maturing toward the substrate's spatial engine.
- Shipped color science on PyPI — 15+ spaces, CIECAM02/CAM16, perceptual ΔE, ICC, HDR tone mapping (quanta-color v1.0.1) plus a Windows display-calibration tool.
Security — build-and-break, for defense
C++23 · RE
- Built a C++23 integrity / anti-cheat framework (~3,000 tests across ~59 modules) detecting tampering, evasion, and manipulation by understanding exactly how they are done.
- Practiced binary reverse-engineering, instrumentation, and red-team research across the stack — repurposed inward to make the accountability platform self-accountable by adversarial construction.