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FIELD NOTES

Practical notes on AI, cloud, and shipping fast.

AI·2026-06-12·7 min

RAG vs. Fine-Tuning: A Decision Framework for SaaS Founders

Most teams reach for fine-tuning when retrieval would have shipped in a week for a tenth of the cost. Here is the decision tree we actually use.

Cloud·2026-05-28·8 min

The $0-to-Scale AWS Architecture: Lambda Cost Optimization

Serverless promises you pay for what you use — but naive Lambda setups quietly burn money on memory, cold starts, and idle waits. Here is how we tune them.

Engineering·2026-06-30·6 min

Shipping AI Features Without Rebuilding Your Product

You don't need a platform migration to add AI. The fastest wins bolt onto your existing stack as a thin, well-bounded service. Here is how we scope them.