Hi, I'm Josh 👋

I build AI agents at Let's Do This, shipping TypeScript at scale. Currently exploring systems programming in Zig on the side.

Before engineering, I spent 8 years in enterprise sales to hedge funds. I wanted to build the tools I used to sell. That background means I think about what users actually need, not just what's technically interesting.

I write about Knowledge Debt on my blog - the gap between shipping fast and understanding deeply.

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Josh Tuddenham

Blog

Writing about the things I'm figuring out. Mostly Knowledge Debt, systems stuff, and whatever rabbit hole I'm currently in.

What's Left When You Unplug?

What's Left When You Unplug?

There is now a permanent gap between who you are with AI and who you are without it. And nobody knows which one is real anymore.

Your Agent's Safety Net Is an If-Statement. Mine Is a Proof.

Your Agent's Safety Net Is an If-Statement. Mine Is a Proof.

Two weeks ago, security researchers found over 1,800 exposed OpenClaw instances. Every vulnerability maps to the same failure mode - a code path that didn't hit the check. Petri nets fix this.

You're Already Building Petri Nets. You're Just Building Them Badly.

You're Already Building Petri Nets. You're Just Building Them Badly.

There's a formalism from 1962 that solves a problem you hit every month. Nobody told you about it.

Your Interview Process is a Liability

Your Interview Process is a Liability

Testing engineers without the tools they use every day is a business liability. It actively selects against the future. Here is the fix.

A Student Disproved a 40-Year-Old Conjecture. I Implemented It.

A Student Disproved a 40-Year-Old Conjecture. I Implemented It.

A student revisited an old paper 'just for fun' and accidentally disproved a 40-year-old conjecture. I decoded the maths and built it - 4x faster than Zig's std.HashMap at 99% load.

Speed Vertigo: A New Kind of Engineering Debt

Speed Vertigo: A New Kind of Engineering Debt

It's not imposter syndrome. It's being over-leveraged in the code you shipped.

Maya: A Multi-Agent Architecture for Conversational AI

Maya: A Multi-Agent Architecture for Conversational AI

How I evolved my AI yoga instructor from a 2000-token monolithic prompt to an orchestrated system of specialized agents - and why separation of concerns might be the most underrated pattern in AI development.

The AI Creativity Paradox: Why Smarter Isn't Always More Creative

The AI Creativity Paradox: Why Smarter Isn't Always More Creative

My journey building an AI yoga instructor revealed a core tension in modern AI: the battle between creative exploration and algorithmic efficiency. This is the story of that paradox.

AIgument: The Art of AI Disagreement – Developing a Language Model Debate Platform

AIgument: The Art of AI Disagreement – Developing a Language Model Debate Platform

Beyond bland AI responses: I built a full-stack debate platform where language models adopt vibrant personalities and argue with adjustable intensity.

Building a Live London Underground Tracker: Learning Go From Scratch

Building a Live London Underground Tracker: Learning Go From Scratch

How I learned Go by building a real-time London Underground tracker, featuring concurrent polling, WebSockets, and lots of debugging.

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Featured Projects

Side projects where I dig into whatever's caught my interest - AI agents, systems programming, tools that solve problems I've actually had.

PetriFlow documentation site

PetriFlow

A Petri net-based safety layer for AI agents. Uses formal verification to enforce tool access control, sequencing, rate limits, and human approval gates before an agent runs.

AIgument

Watch AI models debate! AIgument pits LLMs (GPT-4o, Claude, Gemini) against each other with unique personalities. Built with Next.js, Vercel AI SDK, and Neon DB.

Music Round game interface

Music Round

A real-time multiplayer song guessing game where players compete to identify songs from Spotify previews. Features daily challenges, battle royale mode, and hint systems.

JoshDesk

When our team's hybrid work tool got prohibitively expensive, I built an alternative. A Slack app that helps teams coordinate office days and collaborate more.

Wooster

Full-stack AI travel planner built with React/TypeScript and Node.js. Features custom itinerary generation, production-grade auth, and automated CI/CD. Live at trywooster.live

Foundations Platform Preview

Foundations

Hackathon Winner

Led frontend development of a diversity data transparency platform, transforming raw pay gap data into actionable insights. Built and deployed in 24 hours, winning Best in Category at JumpStart Hackathon.

Portfolio Website

Portfolio Website

A modern, content-focused portfolio built with Astro, featuring a blog system, responsive design, and optimal performance through static site generation.

Goss

Architected a robust real-time social platform featuring WebSocket notifications, social graph management, and file handling. Built with Next.js, TypeScript, and Supabase.

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Developer Tools & Utilities

Smaller tools and starter kits I've built along the way.

Elastic Hash Zig

SIMD-accelerated elastic hashing implementation in Zig. 4-8x faster inserts than std.HashMap at 99% load factor.

petri-ts

A TypeScript Petri net engine on npm. Define places and transitions, fire them, analyse reachable/terminal states, check invariants, and export Graphviz DOT.

Petri Net

A Petri net engine and three worked examples that teach concurrency concepts, with a reachability analyser that proves invariants.

Bun Server Starter

A production-ready Bun HTTP server template with TypeScript, structured logging, and proper error handling.

Go AI Agent Foundation

A foundational Go project for building AI agents that interact with users and utilize tools, defaulting to the Anthropic (Claude) API.

PyAgent

An AI-powered code assistant built with Python and Google's Gemini API. Features file management, code execution, and an agentic loop for completing complex tasks.

Contact

Looking to build something interesting, tackle a tricky technical challenge, or just want to chat about tech? I'm always open to exploring collaborations, discussing emerging technologies (especially in AI and Go!), or debating the finer points of system design.

[email protected] joshuaisaact joshuatuddenham @joshtuddenham.dev