AI-native builder & writer
I build production AI systems (retrieval, fine-tuning, agents on the edge) and write about the engineering underneath the hype.
Now Eval harnesses, and working out continual-learning for real-world RAG.
Working threads the two I'm deepest in
Applied AI & ML 4 pieces
Production RAG, fine-tunes and evals: what I shipped, and how I know it works. S3 Vectors in production as an AWS launch partner, plus the eval harness that keeps the claims honest.
07 July AI Memory Is Cosmetic 02 June 107 Sub-Agents, All on Opus: Guarding Claude Code's Most Expensive Default 12 May We Were Going to Build More Vector Servers. AWS Sold Us Storage Instead.
Open thread → Systems & infrastructure 7 pieces Distributed systems, edge platforms and the infrastructure-as-code that keeps them honest, plus the incidents from when they broke.
02 June 107 Sub-Agents, All on Opus: Guarding Claude Code's Most Expensive Default 26 May The CloudFormation Recovery AWS Documents in Halves 12 May We Were Going to Build More Vector Servers. AWS Sold Us Storage Instead.
Open thread → Writing 15 published
07 July AI Memory Is Cosmetic essay 10 June Home-Cooked Software: I Built My Wife the App the Market Was Never Going to Make essay 02 June 107 Sub-Agents, All on Opus: Guarding Claude Code's Most Expensive Default build-log 26 May The CloudFormation Recovery AWS Documents in Halves incident 12 May We Were Going to Build More Vector Servers. AWS Sold Us Storage Instead. architecture 06 May 7 Models, 2 Deployment Targets, and the Part That Actually Mattered Was Calibration build-log The full archive → Shipped selected · live & open-source
FormRecap Form abandonment recovery for the rest of us. Captures partial submissions in real-time and sends magic-link recovery emails that restore the user's exact form state. 100% Cloudflare-native. Cloudflare Workers · Durable Objects · D1 Skopia Privacy-first web analytics you self-host on your own Cloudflare account. Cookieless visitor identity from a daily-rotating HMAC, exact rollups written by a Durable Object, and a 554-byte tracker, all on the free tier. Cloudflare Workers · Durable Objects · Workers Analytics Engine The Goblin's Game Parlour A Cloudflare-native RAG app that answers tabletop rules questions from the actual rulebook, with every ruling grounded in the text and cited so you can check it. Hybrid retrieval, cross-encoder reranking, and a prompt-injection eval, all on Workers AI. Cloudflare Workers · Agents SDK · Durable Objects FormRecap LoRA Classifier 7 LoRA adapters across 4 model families for form abandonment classification. The best fine-tune hit F1 = 0.96 on a 6-class task where every general-purpose baseline scored 0.06. Dual-deployed on Modal for power and Cloudflare Workers AI for production inference. Llama 3.2 3B · Gemma 2B · QLoRA / DoRA All work → All threads the notebook's index