Hi, I'm Josh 👋

I'm a senior engineer at Let's Do This, where I build AI agents and platform features in TypeScript. Outside work I write Zig, Go, and whatever else catches my interest.

I went from pitching portfolio managers to writing hash tables in Zig.

I write about engineering on my blog.

Blog

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

April 13, 2026

Lossless Compaction for AI Agents

Claude Code, Codex, and Cursor all handle context limits differently. I tested an alternative, pointer-based compaction, and it beats summarization by 18 points on grounding after two compactions.

April 9, 2026

Stop Multitasking. Parallel Agent Workflows Are Making You Slower And Burning You Out

I've tested every multi-agent orchestration setup. Conductor, Cursor, Claude Code Max. I was faster single-threaded. The cognitive science on this runs decades deep.

March 28, 2026

59% More Code. 30% More Failures. The Toolchain Bottleneck Is Here.

AI-generated code is flooding pipelines. Main branch success rates hit a five-year low. The Rust rewrite wave accidentally built the verification infrastructure agents need.

March 21, 2026

Anthropic Quietly Killed Three SaaS Categories This Week

Most coverage focused on individual features. Nobody zoomed out to see what Anthropic did across the full week: absorb three categories of SaaS tooling into their own surface area.

March 2, 2026

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.

February 16, 2026

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.

February 8, 2026

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.

January 27, 2026

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.

January 15, 2026

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.

January 6, 2026

Speed Vertigo: A New Kind of Engineering Debt

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

August 26, 2025

Maya: A Multi-Agent Architecture for Conversational AI

My AI yoga instructor had a 2000-token monolithic prompt and kept forgetting what it was doing. I split it into five agents. Each one got smaller, faster, and more reliable.

July 30, 2025

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

I built an AI yoga instructor. The smarter she got at finding existing sequences, the less she created new ones. That's a problem worth thinking about.

May 13, 2025

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

I built a platform where LLMs debate each other with custom personalities and adjustable spiciness. A Sassy Drag Queen vs a Noir Detective at Extra Hot is worth watching.

January 6, 2025

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

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

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

Hackathon Winner

Gender pay gap dashboard for 11,000+ UK companies. Built in 24 hours at JumpStart Hackathon, won Best in Category.

Portfolio Website

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

Goss

A voice-first social platform with real-time 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

TypeScript

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

TypeScript

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

Go AI Agent Foundation

A CLI agent framework in Go with tool use, file operations, and ripgrep search. Uses the Anthropic API.

PyAgent

Python

A CLI code assistant in Python using Gemini. Reads and writes files, runs scripts, and loops until the task is done.

Contact

I'm most interested in AI agent development right now, but happy to talk about anything. Say hi.

[email protected] joshuaisaact joshuatuddenham @joshtuddenham.dev