Hedgehog
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.
Selected work
All projects
Transparent.space
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.
Picnic
Brand identity and a campaign-ready visual system built to scale across social, launch moments, and growth touchpoints with a consistent, ownable look.
(Services)
01
Brand Strategy
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.
02
Visual Identity
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.
03
UX/UI Design
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.
04
Systems & Guidelines
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.
About Me
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 wins hackathons at ETHSamba 2023(ETH) and Blockchain.Rio 2024(Ripio)/25(BASE). Whether shaping a product from zero to one or refining an existing system, I bring strategic thinking, strong product intuition, and a high level of craft to everything I build.
Tools & Skills
Testimonials
What clients say
"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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Let's create something great together
Have a project in mind? I'd love to hear about it. Let's discuss how I can help bring your vision to life.
Available for new projects