03 — What I did.

Things I've
built & shipped.

Projects, systems, websites and documentation — growing as I build.

Three Tone English

AI writing assistant built with Next.js and OpenAI APIs. Helps users improve English writing with tone-aware suggestions.

Next.jsOpenAI APIAI Live

DB_ Brand Guide

Visual identity system — typography, color palette, logo rules and tone of voice for douglasbarbosa.com.

Design SystemBrand Doc

douglasbarbosa.com

Personal site — mobile-first, clean design, built from scratch with custom brand identity.

ReactMobile-first In progress

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More coming. This page grows as I ship — apps, systems, client websites and more.