I don't just design interfaces.
I solve problems.
I'm Matheus Fonseca, a UX/UI & Product Designer based in Rio de Janeiro, Brazil. I specialize in turning complex systems into clear, intuitive experiences that drive real outcomes. From Web3 platforms to healthcare products, I design with a focus on usability, clarity, and meaningful impact.
I don't just deliver interfaces. I structure products. I've designed complex systems across Web3, working from zero to one and translating technical concepts into usable, scalable experiences. My work has been recognized through hackathon wins at ETHSamba 2023 (ETH) and Blockchain Rio 2024 (Ripio) / 2025 (BASE).
Tools & Skills
Services
Brand Strategy
Research, competitive mapping, audience insights, naming, messaging, and architecture that guide design and go to market.
Visual Identity
Distinctive identities paired with a precise system of type, color, imagery, motion, and iconography.
UX/UI Design
From research and wireframes to polished interfaces — products that solve real problems across all devices.
Systems & Guidelines
Components, templates, and usage rules that keep your brand and product sharp at every scale.
Have a project in mind?
fonsecaa.design@gmail.com