Available for high-leverage work

Realtime systems · AI products

FULLSTACKDEV&AIBUILDER.

I build products that make complex systems legible — realtime apps, AI-integrated workflows, and information surfaces that turn technical depth into a visible advantage.

View flagship work →Open signal feed

Latest ranked signal

The last six months in LLMs in five minutes

SIMONW2h agoscore 68Open signal feed →

Experience

10+ yrs

Live sources

Shipped systems

Published essays

Featured builds

Signals ranked

Current systems

Active work,
live signals, and writing.

Featured builds, the latest ranked signal, and recent writing — all in one place.

Featured build

MAINFRAME

Open-source bash stdlib for AI agents. Signals systems-level engineering range. Shows open-source authorship.

Pure bash runtime · Agent working memory primitives

Latest ranked signal

The last six months in LLMs in five minutes

<p>I put together these annotated slides from my five minute lightning talk at PyCon US 2026, using the <a href="https://tools.simonwillison.net/annotated-presentations">latest iteration</a> of my <a href="https://simonwillison.net/2023/Aug/6/an

SIMONW · 2h ago · score 68

Publishing system

Building Realtime Apps with SpacetimeDB and Next.js 15

A deep dive into SpacetimeDB's TypeScript SDK and how to wire it into a Next.js 15 App Router application for live visitor tracking and realtime features.

3 min read · spacetimedb · next.js

Open-source ecosystems

Projects I support

Small but important signal: I contribute to and support AI-native developer tooling beyond my own products.

PI.DEV / AGENTIC DEVTOOLSPi coding agentSupporting the open-source coding-agent stack behind Pi-style local AI development workflows.GitHub →MULTI-AGENT WORKSPACEScmuxHelping push the terminal/workspace layer for orchestrating agents, browsers, and engineering sessions.GitHub →

✦ Selected Work

Systems I've Built

● LIVE

2024

JPope Tax Portal

Enterprise client portal for tax consultancy

Full-featured client portal built for JPope Tax Consultancy. React, TypeScript, Next.js frontend backed by Convex for real-time data sync. Role-based access, document management, and client communication tools.

ReactTypeScriptNext.jsConvexEnterprise

Outcomes

■Unified client communication surface

■Reduced manual back-office overhead

Architecture

Role-based accessRealtime data syncDocument workflows

● LIVE

2025

TaxScout.app

AI-powered commercial real estate tax optimization

Commercial real estate tax optimization platform for multifamily properties. Cost segregation analysis, 1031 exchange calculations, REPS qualification, and accelerated depreciation schedules. MCP-connected for AI agent access.

Next.jsTypeScriptAI/MCPReal EstateTax Engineering

Outcomes

■Turns niche tax logic into a usable product

■Demonstrates AI + domain depth

Architecture

AI agent publishing surfaceTax calculation workflowsMultifamily domain modeling

View live →

● LIVE

2025

MAINFRAME

Open-source bash stdlib for AI agents

4,000+ pure bash functions: JSON, strings, arrays, HTTP, CSV, git, Agent Working Memory (AWM), RAG, embeddings, and multi-agent orchestration. The codex for AI-native shell scripting.

BashOpen SourceAI AgentsAWMRAG

Outcomes

■Signals systems-level engineering range

■Shows open-source authorship

Architecture

Pure bash runtimeAgent working memory primitivesCLI-first orchestration surface

View repo →

● LIVE

2024

PropertyJunk.com

Junk removal SaaS with integrated CRM

Complete SaaS platform for junk removal operations. Real-time fleet tracking, employee management, customer CRM, scheduling, and billing—all in a single unified interface. Built for scale.

Next.jsTypeScriptConvexReal-timeSaaS

Outcomes

■Turns field operations into software

■Demonstrates breadth across product surfaces

Architecture

Operations dashboardFleet and scheduling workflowsUnified CRM + billing

● WIP

2026

toddwatts.dev

This site — a living experiment

Next.js 16 + SpacetimeDB realtime backend. Headless MDX blog publishable via MCP from Pi or Claude. GHOST SIGNAL design system. Veo 3 video assets. Remotion animations.

Next.js 16SpacetimeDBRemotionVeo 3TypeScript

Outcomes

■Acts as a public product demo

■Shows how content, design, and systems connect

Architecture

Signal feed aggregationHeadless publish APIRealtime-ready portfolio shell

View live →

● LIVE

2026

Pi CMUX

Local multi-agent command center for Pi + CMUX

Open-source Pi extension family that connects Pi with CMUX for local multi-agent workflows: orchestration, session bridging, browser intelligence, and design execution in one package.

Open SourcePiCMUXAI AgentsTypeScript

Outcomes

■Makes local agent teams easier to coordinate

■Connects browser and terminal work surfaces

Architecture

Agent orchestration layerPi session bridgeBrowser lock + checkpoint system

View repo →

✦ My PostsView All →

Feb 28, 2026Latestspacetimedbnext.js

Building Realtime Apps with SpacetimeDB and Next.js 15

A deep dive into SpacetimeDB's TypeScript SDK and how to wire it into a Next.js 15 App Router application for live visitor tracking and realtime features.

3 min read

→

Feb 14, 2026Latestaillm

Fine-tuning Llama 3.2 on Custom Datasets — What I Learned

After three weeks of iteration on fine-tuning Llama 3.2 with custom datasets, here are the practical lessons that saved me from wasting GPU hours.

Ranked signal feed

The last six months in LLMs in five minutes

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