Hi, I'm Jeferson Vieira. Multidisciplinary Product Designer focused on turning complexity into business efficiency

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Let's talk

I develop intuitive digital products and scalable systems that balance user experience, technical feasibility, and business goals.

Mobile app interface for a grocery delivery service showing the homepage, product listings, discount coupon section, and product details for rice, with a background in orange and white.

Sabor Econômico /// Mobile App

A screenshot of a digital dashboard or report with sections of text in Portuguese, including titles about documents and time signatures, and various colorful charts and graphs.

New Chart and Dashboard Library /// netlex

A laptop and a smartphone displaying the homepage of netlex, a document management and agreement platform, with a blue background.

Redesign Website /// netLex

backfill-legacy-documents

Application of Management Data to Documents (Backfill) /// netlex

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My approach

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AI-Optimized Workflow

I use AI tools to speed up discovery, data synthesis, and prototyping, quickly turning messy insights into validated design concepts.


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 Problem Solving & System Vision

 I map out system architectures and anticipate friction to transform complex user flows into clean, intuitive, and logical experiences.

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Business & Tech Alignment

 I collaborate with Product Managers and Engineers to ensure design decisions respect technical constraints and drive company growth.

In their words

  • "A dedicated and curious Product Designer, always trying to fully understand problems before proposing solutions. Easy to work with, collaborative, and open to different points of view."

    Thais Muchon - Product Manager, netLex

  • "His decisions were well grounded, backed by real user conversations and usability tests. We had constant technical conversations to make sure product decisions were feasible and aligned with engineering."

    Natalia Marufuji — Software Engineer

  • "He always went deep into the problem before thinking about the solution. Priority was understanding the real issue, not just delivering something that looked good. He recently led an AI initiative to optimize the whole Design team's workflow."

    Giuliano Griffante — Staff Product Manager

UX Design

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UI Design

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Web Design

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UX Design * UI Design * Web Design *

Lets Talk!

Feel free to reach out for collaborations or just say hello Jef!
email: designbyjef@gmail.com

Get in touch