Projects

Data analysis and visualization work

Daniel Chesnut•San Jose, CA

I use AI as a development multiplier. I architect the systems, make the design decisions, and direct the implementation — using Claude Code and Wispr Flow (speech-to-text) to ship at 5x the pace of traditional development.

Every project here was planned, reviewed, and iterated on localhost before shipping. The architecture, metric selection, and business logic are mine. AI accelerates the build — it doesn't replace the thinking.

SaaS Analytics Dashboard

B2B SaaS Metrics Platform with Live Data

Revenue analytics

A complete analytics platform showcasing revenue, customer health, churn, and operational metrics — the kind of dashboards I build for real companies. 35+ live metrics from Supabase PostgreSQL, 80+ API endpoints, Observable Plot charts, and a development log documenting every major build session.

Next.jsSupabaseObservable PlotdbtWebAssembly

LumiLexicon

AI-Powered Antiquarian Book Business Tool

Password Protected

Inventory table with status filters

End-to-end book-flipping business tool: video scan a book, AI extracts frames and identifies it, voice narration sets condition and grading, Claude generates valuations and listing descriptions, then pushes to eBay via API. Built for pre-ISBN, pre-barcode rare books where traditional scanners fail.

Claude VisioneBay APISupabaseMobile-FirstWebRTC

Nonprofit Public Filings Explorer

ProPublica API Integration

Grant distribution map

Search any nonprofit by name or EIN and explore their IRS filing data — revenue, expenses, balance sheets, officer compensation, grant recipients, and distribution compliance. Parses raw 990-PF XML from ProPublica into interactive D3.js visualizations with Leaflet maps and full spreadsheet export.

D3.jsProPublica APIData VizIRS 990-PFSupabase

HealthScope

Automated Google Slides Pipeline

Automated pipeline flow

A fully automated presentation built entirely by Claude Code — from raw CSV data to a polished 17-slide Google Slides deck with D3.js charts, Sankey diagrams, and waterfall analyses. Zero manual slide editing: 6,230 encounter records parsed, analyzed, visualized, and assembled via 900+ Google Slides API requests.

Claude CodeGoogle Slides APID3.jsPuppeteerNode.js

Unified Design System

Cross-Brand Visual Language & Style Guide

Color palette reference

A living design system comparison across three brands — Sobrato, LumiLexicon, and Chestnut.ai. Side-by-side analysis of typography, color palettes, chart colors, icons, and UI elements, with a synthesized unified proposal inspired by Accurat's La Lettura visualizations and 19th-century ethnographic art.

Design SystemTypographyColor TheoryData VizAccurat

Research

PDF Q&A with Claude Files API + Prompt Caching

Password Protected

Drop zone

Drop a PDF, ask it anything. A working tool and a live demonstration of two stacked Anthropic API features — the Files API and prompt caching — with every token priced out on the page. First question pays cache-write; follow-ups inside the 5-minute window read cached tokens at 10&percnt; of the normal input rate. Admin-only; the receipt reveals exactly where the dollars go.

Claude APIFiles APIPrompt CachingSSE StreamingSupabase

Metric Reels

Manim-Powered Data Animations

Cohort Retention

Cinematic SaaS metric animations generated by Claude Opus and rendered with Manim — the engine behind 3Blue1Brown. Pick a chart, generate a scene, refine conversationally, publish.

ManimClaude OpusData VizPythonFFmpeg

La Cuesta Handyman

A Free Website for a One-Man Trade

Home

A friend runs a one-man handyman shop and never had a website, so I built him one — what he does, where he works, and a contact form that's easy from a phone, photos and all. Requests land in my inbox and I pass them along. It's a template: the next tradesman who needs a hand getting online is just another config file.

Next.jsSupabaseResendMulti-TenantMobile-First