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equationalapplications/README.md

Equational Applications LLC

Kurt VanDusen — Founder and Sole Member

Equational Applications LLC publishes software and provides freelance full-stack development services for web and mobile. Specializing in AI-powered apps built with React Native / Expo, Firebase, Google Cloud, and modern AI (Vertex AI, Anthropic Claude). Building in public.

React Native · Expo · React · Node.js · TypeScript · PostgreSQL · Apollo GraphQL · Vertex AI · Anthropic Claude · Firebase · Stripe

equationalapplications.com
info@equationalapplications.com
(616) 528-0098

Connect

LinkedIn
Upwork Profile
GitHub

Skills

  • React Native & Expo
  • React
  • Node.js
  • TypeScript
  • Google Cloud / Vertex AI
  • Anthropic Claude (AI)
  • Firebase
  • PostgreSQL / Cloud SQL
  • Apollo GraphQL
  • xState & TanStack Query
  • Stripe Payments
  • REST API
  • Git & GitHub Actions (CI/CD)
  • Expo EAS
  • Docker
  • LangChain / LangFlow / ChromaDB
  • HTML, CSS & JavaScript

Certifications

Press

Conversations with Kurt VanDusen — Voyage Michigan Magazine

Work Experience

Full Stack & Mobile Engineer — Spectrum Net Designs, Inc (Oct 2023 – Mar 2026)
Full-stack and mobile development for Auctioneer Software. Built and maintained React, React Native (Expo), and Node.js applications deployed on bare-metal Kubernetes. Managed Play Store and App Store releases, handled CI/CD pipelines, and contributed across the entire stack from database to mobile client.

Owner / Software Developer — Equational Applications LLC (Mar 2020 – Present)
Independent contracting, consulting, and software development. Building AI-powered mobile and web apps with React Native, Expo, Firebase, Google Cloud, and Vertex AI.

Music Producer — equationalsound.com (2001 – Present)
Indie music recording and publishing.

Owner — Under the Sun Artisan Goods / utsag.com (2019 – Present)
Online retail: beads, gemstones, and jewelry.

Web Developer — Alley Cat Bead Company (2001 – 2015)
Drupal e-commerce website developer for online retail store.

Owner — Webstore Specialist (2005 – 2010)
Website development for e-commerce and SEO services.

Owner — Harmony Grounds Cafe (2000 – 2005)
Coffee, food, music, and culture at Harmony Grounds in Gaylord, Petoskey, and music festivals of Michigan.

Education

University of Chicago (1989 – 1990)
Honors Physics, Honors Calculus

Self-Taught Developer (Always)
Grew up going to computer camp and fixing home computers. Created one of the first 3D first-person shooters in 1983. Built an artificial neural network on an Amiga in 1991. Builder of chatbots and AI apps.

Projects

Clanker — Open Source AI Chatbot App

Open source AI chatbot platform built in public. Users create custom AI characters and chat with them using Vertex AI. Firebase + Cloud SQL backend with subscription-based access control.

Stack: React Native · Expo · TypeScript · Vertex AI · Anthropic Claude · Firebase · PostgreSQL · Stripe

clanker-ai.com · GitHub · App Store · Google Play

Curated Thoughts

A privacy-first, LLM-curated wiki for your second brain.

GitHub

expo-llm-wiki

A modular LLM wiki memory system for React Native / Expo apps. Provides structured, queryable facts, tasks, and episodic events for AI characters and agents.

expo-llm-wiki — Mono Repo

  • Typescript Core Logic
  • React Hooks
  • Expo Package

Marketing Agent — GCP + Vertex AI

Hybrid marketing agent for promoting a cross-platform app. Vertex AI Agent Builder for campaign logic, Cloud Run for production deployment.

github.com/equationalapplications/marketing-agent-gcp-adk

RAG Chatbot — LangFlow + ChromaDB

Local retrieval-augmented generation chatbot using LangFlow, ChromaDB, and OpenAI. Fully Dockerized.

github.com/equationalapplications/RAG-LangFlow-ChromaDB

Instructor — Eduonix Jamstack Microservices E-Degree

Instructor for the "Microservices Using NodeJS" module of the Jamstack E-Degree from Eduonix.

Demo App · Sign up on Eduonix

ViroReact AR — Open Source Contributions

Contributed updated examples to the @ViroCommunity ViroReact augmented reality library for React Native.

samples · starter-kit

AR Tutorial Videos:
Hello World ViroReact · React Native AR/VR Stack

Pinned Loading

  1. clanker clanker Public

    Clanker

    TypeScript 4

  2. curated-thoughts curated-thoughts Public

    A private second brain desktop app — Tauri 2.x + React + Rust + Ollama

    Rust 1

  3. expo-llm-wiki expo-llm-wiki Public

    Offline-first, SQLite-backed memory for LLM apps built with Expo

    TypeScript 2

  4. RAG-LangFlow-ChromaDB RAG-LangFlow-ChromaDB Public

  5. firebase-auth-supabase-bridge firebase-auth-supabase-bridge Public

    Exchange a Firebase Auth token for a real Supabase session — no Supabase SSO add-on required.

    TypeScript

  6. marketing-agent-gcp-adk marketing-agent-gcp-adk Public

    A hybrid marketing agent setup for promoting a cross-platform app. Uses Vertex AI Agent Builder for campaign logic and Cloud Run for production deployment.