00/Introduction
Product designer · Rio de Janeiro
Designing digital products where strategy, systems and experience meet. Hackathons winner, former American football competitor, and product designer inspired by fashion, architecture, culture, music and food.
Discovery → IA → systems → hand-off. Craft that holds up in production.
C to copy email · Send a message
End-to-end product design for a time-based prediction platform fast decisions, clear states, and conversion-focused flows, plus a separate waitlist landing built to turn traffic into qualified leads.
View project ↗
An institutional-grade product turning complex on-chain liquidity and market data into clear, actionable insights for daily decision-making. Supported by a visual identity and UI system built to communicate trust, structure, and operational clarity.
View project ↗
Brand identity and a campaign-ready visual system built to scale across social, launch moments, and growth touchpoints with a consistent, ownable look.
View project ↗“Fonseca has been an exceptional designer to work with. He combines strong visual intuition with a clear understanding of product goals, which consistently results in designs that are not only visually striking but also practical and user-focused. What stands out most is his ability to translate abstract ideas and rough direction into clean, well-thought-out design systems. He works fast without sacrificing quality, communicates clearly, and iterates thoughtfully based on feedback.”
“Fonseca is my go-to designer for everything. I explain it once, and he comes back with something insanely premium. Zero back-and-forth, always top-tier.”
“Fonseca is a hardworking guy and I decided to hire him for AI Agent Arena because of his outstanding skills on UX/UI and also his strong communication skills which led to the success of v1 for AI Agent Arena.”
“Working with Fonseca was a great experience. He took our brand positioning and translated it into a cohesive visual identity system—defining clear standards and templates that made it so much easier to create social media content and apply our brand consistently across different touchpoints. His ability to understand not just what we needed, but why we needed it, made all the difference. Highly recommended.”
“Fonseca has been an exceptional designer to work with. He combines strong visual intuition with a clear understanding of product goals, which consistently results in designs that are not only visually striking but also practical and user-focused. What stands out most is his ability to translate abstract ideas and rough direction into clean, well-thought-out design systems. He works fast without sacrificing quality, communicates clearly, and iterates thoughtfully based on feedback.”
“Fonseca is my go-to designer for everything. I explain it once, and he comes back with something insanely premium. Zero back-and-forth, always top-tier.”
“Fonseca is a hardworking guy and I decided to hire him for AI Agent Arena because of his outstanding skills on UX/UI and also his strong communication skills which led to the success of v1 for AI Agent Arena.”
“Working with Fonseca was a great experience. He took our brand positioning and translated it into a cohesive visual identity system—defining clear standards and templates that made it so much easier to create social media content and apply our brand consistently across different touchpoints. His ability to understand not just what we needed, but why we needed it, made all the difference. Highly recommended.”