Joshua Tuddenham | Full-Stack Engineer

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 and Go on systems-level projects. In a past life I sold AI software to hedge fund managers. I write about engineering on my blog.

Blog

What Learning Zig Taught Me About Harness Engineering

Months of building in Zig changed what I reach for first when I hit an AI engineering problem. The constraints turn out to rhyme.

Forks and Locks: Why Smarter Decoding Can't Fix a Model's Distributions

I tried to make a code model smarter at inference time. Adaptive decoding, entropy thresholds, the works. It made things worse. Then self-distillation fixed it in four minutes.

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.

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.

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.

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.

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Featured Projects

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.

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Developer Tools & Utilities

Auto Claude

Shell

A shell harness that lets Claude Code optimize code autonomously. Point it at a file, give it a benchmark, and it loops -editing, measuring, committing or rolling back -until it beats the baseline. Built 53% faster JSON serialization and 3.7x faster glob matching this 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.

Contact

[email protected] joshuaisaact joshuatuddenham @joshtuddenham.dev