Leo Souza is a senior product designer who takes on hard problems for the thrill of building something new.

Let the system do the work: device codes decide the setup path.

A 34-screen onboarding architecture across five user roles.

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A design system built as a product that serves other products.

Shared tokens, components and governance for product and marketing.

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Operators could not see the system. The dashboard and admin panel show it.

System visibility and admin control for contactless payments in the transit networks of Brasília, Rio de Janeiro and Buenos Aires.

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A secure messaging app that keeps every customer conversation compliant.

Chats and calls on WhatsApp, iMessage and Telegram, archived and protected without slowing sales teams down.

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