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dgDavid Gray

Portfolio

Things I've built, and what each one taught me

Production defense software I can only describe in outline, research projects with the numbers attached, and side projects I built because something annoyed me. Sorted by how much I want you to read them.

Launch Wordlet
Professional2021 — present

A processor built from the ground up

Kernel, task scheduler and communication protocol written from nothing, in C and Ada, now in production and distributed globally.

In production. Globally distributed.
CAdaRTOSBare metal
Capstone2021

Sign Language Interpretation System

Control any smart device with American Sign Language — hand tracking, a gesture classifier and grammar correction, wired together over a client-server link.

98.8% accuracy across 14 hand gestures
PythonTensorFlowComputer visionCNN
Research2025

Patient Care Portal Triage

An NLP pipeline that routes patient portal messages to the right team and surfaces relevant evidence-based research while they wait for a human.

Classifies sentence embeddings into care teams, then retrieves supporting research
PyTorchEmbeddingGemmaNLPInformation retrieval
Personal2023 — present

Bindersnap

GitHub for everyone who doesn't use GitHub — document management, review lifecycle, team collaboration, search and an in-browser editor.

Started because my wife complained about her company's policy platform
GoVueAWSSQL
Professional2023

A system library that runs anywhere

One portable C++ library targeting any RTOS or bare-metal system, packaged with Docker, Bazel and GitLab CI — cutting porting work by 4×.

4× fewer engineering hours spent on porting
C++BazelDockerGitLab CI
School2026

LaCam for Multi-Agent Path Finding

A from-scratch LaCam solver for CS440 — agents searching a space of joint configurations, each expanded by a constraint tree that rules out collisions and swaps.

Search over joint configurations, not per-agent paths — the whole trick of LaCam
PythonSearchMulti-agent systems
Personal2024
Playable

Wordlet

A word guessing game built in Flutter and compiled to the web — playable right here, no install, no account.

Play it in the browser in about two seconds
DartFlutterWeb
School2020

Handwritten digit recognition with weighted KNN

A KNN classifier for handwritten digits, plus a k-value optimizer that collapses repeated distance calculations into a single pass.

Optimizes k without recomputing distances per candidate
PythonKNNOptimization
School2020

ID3 mushroom classification

A from-scratch ID3 decision tree that predicts whether a mushroom is edible or poisonous from its attributes.

PythonDecision treesInformation gain
Personal2026

This website

A static site built with Astro, hosted free on GitHub Pages, designed so writing a post costs one markdown file and nothing else.

Zero JavaScript on most pages
AstroTypeScriptTailwindGitHub Pages

Let's connect

Want the version with more detail?

A lot of the best work is easier to explain out loud than in writing. Ask me about any of it.

Email me

Usually replies within 24 hours · St. Louis, Missouri

ESC

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davidgraymi@gmail.com

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Download Résumé

Word document (.docx)

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Play Wordlet

Launch the Flutter word puzzle in browser

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Visit GitHub

github.com/davidgraymi

External

Visit LinkedIn

linkedin.com/in/david-gray-mi

External

A processor built from the ground up

Kernel, task scheduler and communication protocol written from nothing, in C and Ada, now in production and distributed globally.

Professional

Sign Language Interpretation System

Control any smart device with American Sign Language — hand tracking, a gesture classifier and grammar correction, wired together over a client-server link.

Capstone

A system library that runs anywhere

One portable C++ library targeting any RTOS or bare-metal system, packaged with Docker, Bazel and GitLab CI — cutting porting work by 4×.

Professional

LaCam for Multi-Agent Path Finding

A from-scratch LaCam solver for CS440 — agents searching a space of joint configurations, each expanded by a constraint tree that rules out collisions and swaps.

School

Patient Care Portal Triage

An NLP pipeline that routes patient portal messages to the right team and surfaces relevant evidence-based research while they wait for a human.

Research

Bindersnap

GitHub for everyone who doesn't use GitHub — document management, review lifecycle, team collaboration, search and an in-browser editor.

Personal

Wordlet

A word guessing game built in Flutter and compiled to the web — playable right here, no install, no account.

Personal

Reinforcement Learning applied to Tetris

An agent that learns to play Tetris — a genuinely fun excuse to get hands-on with reward shaping.

School

Handwritten digit recognition with weighted KNN

A KNN classifier for handwritten digits, plus a k-value optimizer that collapses repeated distance calculations into a single pass.

School

ID3 mushroom classification

A from-scratch ID3 decision tree that predicts whether a mushroom is edible or poisonous from its attributes.

School

Healthcare length-of-stay estimator

A data mining project predicting how long a patient will stay, from admission-time features.

School

This website

A static site built with Astro, hosted free on GitHub Pages, designed so writing a post costs one markdown file and nothing else.

Personal

GPU vs. CPU: Roofline Benchmarks on Apple Silicon MPS with neural-cost v0.2.0

The neural-cost v0.2.0 GPU benchmark moves from CPU roofline analysis to Apple Silicon's MPS GPU backend — measuring PyTorch and JAX across five architectures, four batch sizes, and both eager and compiled execution modes.

Post

PyTorch vs. JAX vs. TensorFlow: A Roofline Benchmark Across 5 Architectures

An empirical investigation comparing PyTorch 2.14, JAX 0.11, and TensorFlow across five model architectures and four batch sizes, measuring compiler speedups, kernel overheads, and hardware limits on Apple Silicon.

Post

neural-cost: Roofline Analysis Across PyTorch, JAX, and TensorFlow

A framework-neutral Python library that estimates a neural network's FLOPs and tensor traffic, measures its runtime, and uses a roofline model to tell you exactly where performance is being left on the table.

Post

I rebuilt this site so that publishing costs one file

The old site was a single 41,000-character index.html. Every change was archaeology. Here is what I replaced it with and why the constraint was maintenance, not design.

Post
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