I design AI products people actually understand.
Hey!
I'm Gustavo, a product designer based in Uberlândia, Brazil. Currently Founding Designer at Duo AI.
Senior Product Designer specializing in AI interfaces, SaaS, and early-stage products. From research to shipped screens, I make the complex easy to use.
8+ years designing digital products, from early-stage startups to companies with millions of users.
WHAT I DO
Services
“I want AI in my product, without scaring my users.”
I design AI features that feel natural: conversational interfaces, LLM integration, and the moments when the model is wrong or unsure. The result is AI your users trust and stay in control of.
“My product is hard to use and I can't tell where.”
I review your core flows with usability heuristics and behavioral data, and show where users get stuck. You get the problems prioritized by impact and effort: an action plan, not a 40-page report.
“My product grew into a maze.”
I own the full cycle: research, design, prototype, test, and production code (Next + Tailwind, via Claude Code). I make the complex feel obvious and ship it working, without waiting on a dev queue.
“I don't know what my users actually need.”
I run qualitative and quantitative research (interviews, usability tests, data analysis) and synthesize it into clear findings. You leave with prioritized product decisions backed by evidence, not guesswork.
“My design is inconsistent and the team reinvents everything.”
I build the full system: tokens, component library, documentation, and governance rules. Your team stops reinventing screens and ships consistent UI far faster.
Portfolio
Product, research, and design cases showcasing my process and decisions.
Product, Design, Research
Duo AI: Consumer Redesign
Redesign and implementation of the main consumer surfaces in Duo AI (sign-in, agents, header, sidebar, and light mode), taken from Figma to code using Claude Code.
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Research, Data, Strategy
Hotmart Club: Creator Journey (JTBD)
Mapped the complete Hotmart Club creator journey using Jobs To Be Done methodology. The goal: identify experience gaps and improvement opportunities across the entire platform (30M+ users).
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Product, Design, Research
Duo AI: Creator Studio
Platform where anyone can create custom AI assistants. I designed the Studio (the creation tool) and the end-user chat experience.
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Product, Design, Research
Raio X Creator
AI-powered analytics platform for content creators. Reads performance signals and returns insights that separate content problems from algorithm problems.
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Design, Prototyping, Testing
Design Sprint: Personalization at Hotmart
4-day sprint to solve a personalization pain point. Prototype validated within the week, shipped to production in 1 month.
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Research, Data, Strategy
Automated Research Repository
Centralized feedback system (CSAT, NPS, support tickets) with dynamic dashboards. Became the primary input for backlog prioritization across product teams.
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Design, Prototyping, Testing
Sonho Grande: School Dropout Prevention
Web and mobile app for Instituto Sonho Grande: helps public school managers and education departments track and prevent school dropout, with risk data visualization and concrete follow-up actions.
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Design, Prototyping, Testing
Softruck: Tracking App Redesign
Complete redesign of a vehicle tracking mobile app. Usability improvements, visual overhaul, and expanded feature set.
View projectWHO I AM
Behind the screens
The side that doesn't fit in a case study.
I started wanting to understand why things work, or don't. That led me to UX. Today I design, research, and build. Not necessarily in that order.
I've spent 8+ years designing digital products, from early-stage startups to companies with millions of users. I care about systems that make sense and processes nobody needs to explain twice. My job is to make the complex feel obvious, and sometimes make the simple feel beautiful.
Key Experience(4)
OPEN SOURCE & CONTENT
Things I've built & shared
Tools, frameworks, and ideas I share with the community.
Let's work together.
Have a product that needs design? Building something with AI and need a designer who gets it? Let's talk.
Available for freelance & contract work · Remote · UTC-3 · Flexible timezone overlap