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Turning complex ideas into intuitive experiences. Every pixel, every interaction — designed to make your users stay.
I identify the position your brand can own and the language to express it with clarity. Research, competitive mapping, audience insights, naming, messaging, and architecture come together as a practical plan that guides design and go to market.
I craft identities that read fast and feel distinctive across every touchpoint. Custom wordmarks and symbols are paired with a precise system of type, color, imagery, motion, and iconography so recognition and recall grow with each impression.
I create intuitive digital experiences that users love and businesses grow. From research and wireframes to polished interfaces, I design products that solve real problems while delivering seamless, beautiful interactions across all devices.
I build living frameworks that keep your brand and product sharp anywhere they appear. Components, templates, and usage rules make teams faster, improve consistency, and scale from product UI to print without losing quality or intent.
A proven approach that ensures we deliver the right solution, on time and on budget.
Research users & business goals to understand the challenge.
Synthesize insights and define a clear design strategy.
Create wireframes, prototypes, and polished UI designs.
Test with real users and iterate based on data insights.
Hand off designs with specs and support development.
I'm Matheus Fonseca aka ''Fonseca'', a UX/UI & Product Designer based in Rio de Janeiro, Brazil. I specialize in translating complex challenges into clear, intuitive experiences that drive real results. From Web3 platforms to healthcare systems, I design products that people actually want to use.
My approach is simple: understand deeply, design intentionally, and deliver with precision. I've led design for enterprise clients like Petrobras Saúde and Unimed Seguros, and won 1st place at ETHSamba 2023 and BlockchainRio 2024. Whether it's a bold brand identity or a full product redesign, I bring strategy, craft, and obsessive attention to detail to every 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."
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Have a project in mind? I'd love to hear about it. Let's discuss how I can help bring your vision to life.
