Blog · Technical Writing§ 07

Engineering notes.

Production AI from the inside.

Eval-Driven LLM Systems: How I Improved Accuracy by 34% Without Changing the Model
AI EngineeringLLMEvalsPrompt Engineering

53% to 87% accuracy — without touching the model. This is the story of building an eval-driven LLM pipeline with prompt versioning, a golden dataset, and Braintrust. And why the cheaper model tied the expensive one.

March 2026 · 10 min read

LLMs Aren't Magic: Lessons From Taking a Legal AI System From Chaos to Production
AI EngineeringLLMProductionLegalTech

Five months in production. Over 3,000 court notifications processed. 99.22% success rate. This is the story of taking a Legal AI system from chaos to production.

November 2025 · 15 min read

From Ambiguity to Sprint: How I Turn a Scattered Founder Conversation Into Something Buildable
Product ManagementScopingSprint PlanningPrototype

A founder with an Excel spreadsheet and a fuzzy vision. One full-stack engineer. Two weeks. This is the story of how I turned a scattered intake conversation into an executable Sprint 1 — and why what I didn't build matters as much as what I did.

March 2026 · 8 min read

PDRO BRANDÃO · Applied AI Engineer