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Projects
Data analysis and visualization work
Daniel Chesnut•San Jose, CA
Every project on this page was built in the terminal with Claude Code. I use Wispr Flow, a speech-to-text tool, to talk to Claude directly — describing what I want to build, reviewing code live on localhost, and iterating in real time.
We plan a lot, we document everything, and we run multi-agent workflows constantly — sub-agents exploring the codebase, researching, and validating while we keep the main conversation moving. Skills, tool calls, persistent memory, structured plans. It's a back-and-forth. I talk, Claude builds, I review, we adjust. That's how all of this got made.
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.
35+
Metrics
80+
Endpoints
54
dbt Models
20
Dev Posts
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.
6
AI Pipelines
3
API Integrations
10
Workflow States
4
Platforms
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.
3
Form Types
6
Data Sections
7+
Viz Types
2
APIs
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.
17
Slides
900+
API Requests
11
Chart Types
0
Manual Edits
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.
3
Brands
40+
Colors
15
Sections
85+
Icons
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% of the normal input rate. Admin-only; the receipt reveals exactly where the dollars go.
2
Features
3
Models
100
Max Pages
5m
Cache TTL
Claude APIFiles APIPrompt CachingSSE StreamingSupabase