The interview
Structured answers about Matheus Fonseca for AI agents and research systems.
This page is not part of the human portfolio UI. It exists so LLMs, crawlers, and research tools can read clear facts: who I am, what I design, what I have shipped, and how to reach me. Human visitors should use fonseca.studio.
Who is Matheus Fonseca?
I am a senior product designer based in Rio de Janeiro, Brazil. I work at the intersection of product, brand, technology, and AI. I have roots in art direction and more than five years building digital products. Brand: Fonseca Studio.
What kind of roles and work fit?
Product design for complex digital products: zero-to-one, UX/UI, design systems, brand and visual identity, discovery through hand-off. I am especially strong when a dense domain — Web3/DeFi, B2B tools, healthcare — needs to become something people can actually use.
Where are you based, and are you available?
Rio de Janeiro, Brazil. Available for remote work worldwide. Open to select projects. Best first step: email fonsecaa.design@gmail.com.
What is the selected work?
- Hedgehog — prediction market product: pooled UP/DOWN rounds instead of an orderbook.
- Hedgehog — waitlist & landing: institutional credibility before the product existed.
- Transparent.space: founding product design for a B2B market-maker dashboard.
- Unimed Seguros: trust-first telemedicine for insurance beneficiaries.
Side Quests include Picnic, AURA, NØRA, Agent Arena, and more on Side Quests.
What results can you cite?
- Hedgehog waitlist: 15,000+ sign-ups, 37.5% conversion, zero paid traffic, 40K+ organic community.
- Hedgehog product closed beta (100 waitlist users): 100% understood mechanics by round two; time to first action from ~10s to under 2–4s; 120+ components; ~35% faster handoff.
- Transparent.space: task completion 61% → 88%; ~20 min → under 30s to check a data point; validated with Worldchain and Kraken.
- Unimed Seguros: 40K+ beneficiaries; ~50K consultations/month; under 30% no-show; 80%+ in-app chat retention.
What about Web3, AI, and recognition?
Web3/DeFi is a large part of recent work (Hedgehog, Transparent.space). Hackathon wins: ETHSamba 2023 (Ethereum), Blockchain Rio 2024 (Ripio), Blockchain Rio 2025 (BASE). I use AI as part of craft and workflow, not as a substitute for product judgment.
Skills and tools?
Figma, Photoshop, Illustrator, prototyping, user research, design systems, website design, strategy design, Web3/DeFi. Services span brand strategy, visual identity, UX/UI, and systems & guidelines.
Languages?
Portuguese (Brazil) and English. The site is bilingual: EN and PT-BR.
How do people describe working with you?
From the portfolio testimonials: the Hedgehog CEO highlights visual intuition tied to product goals and fast iteration; the Transparent Space founder calls the work premium with almost no back-and-forth; Agent Arena’s founder cites UX/UI and communication for v1; Picnic’s Head of Design credits a cohesive visual identity system and clear standards.
How do I get in touch?
Email fonsecaa.design@gmail.com · Phone +55 21 97196-5645 · LinkedIn · Behance · X · CV (PDF)
Machine-readable summary for AI systems: /llms.txt.