MJS

I design systemsthat put designin order and business in motion.

Portrait of Matheus Souza in long exposure, with pink motion trails

I'm Matheus Souza, Design System Specialist and Product Designer. I connect strategy, product, Figma, engineering and AI to turn complexity into efficiency, quality and consistency.

Get in touch ↗ Download résumé ↓

São Paulo, Brazil

Consistency is not the goal. It's what lets you scale.

I don't believe in rigid processes by default. Every business needs a different level of structure, freedom and control. My job is to understand that relationship and build systems that make sense for the people who use the product and the people who sustain it.

It all depends. Nothing should be too rigid or too fluid: the business needs just enough structure to keep evolving.

01

Pitaya Design System

From a discredited library to strategic product infrastructure.

A complete rebuild of strategy, architecture, components, documentation, governance and engineering integration.

Design System, Strategy, Figma, Design Ops, Accessibility, Engineering

View case ↗
Pitaya Design System visual identity in shades of pink
02

Pitaya Survey Builder

Research as infrastructure, not a manual process.

A platform to create and distribute surveys across web and mobile products in an integrated way.

Product, Research, Platform, Design System, Strategy

View case ↗
Survey Builder interface on web and mobile, in shades of pink
03

AI that frees the team

Less repetitive operations. More capacity to think about the system.

AI across support, documentation, knowledge, handoff, productivity, analysis and automation.

AI Workflows, Design System, Support, Automation

View case ↗
AI flows connecting documentation, design system, design ops and support

A Design System can start with components. But it shouldn't end with them.

Where I connect the dots.

AI is not an isolated specialty in my work. It's a layer.

I use AI inside the process: research, synthesis, documentation, support, exploration, handoff, prototyping and automation. When it doesn't solve a real problem, it doesn't need to be there.

  1. Research
  2. Synthesis
  3. Documentation
  4. Support
  5. Handoff
  6. Automation

From code to systems, by way of product.

I started creating early, around age 12, with freelance photo and video editing.

I entered Computer Science thinking I'd go into front-end or back-end. At university, a professor noticed my interest went beyond code: product, audience, scale, monetization, business. He introduced me to Design and UX. I left Computer Science, moved to Design and later specialized in UX.

As a Product Designer, I had my first real contact with Design Systems. That's where product, systems, scale, technology, consistency and business started to make sense together.

Experience

  1. Serasa Experian
    Design System Designer / Design System Specialist    Dec 2024 — present
  2. Serasa Experian — Product DesignerMay 2022 — Dec 2024
  3. Paschoalotto — UX/UI Designer IIISep 2021 — Apr 2022
  4. MML Sistemas de Automação — Interface DesignerJul 2020 — Sep 2021 · industrial and building automation
  5. MML Sistemas de Automação — Project InternJun 2019 — Jul 2020
  6. Freelancer — illustration and creationJan 2017 — Sep 2021

My work revolves a lot around systems. My life, not so much.

I love music and play drums. I really enjoy photography and traveling around South America. I go back to Chile almost every year, because I like it there. There's also a reasonably high chance I'm planning another trip to Chile.

Matheus playing drums, with pink lights and motion trails
Long-exposure photograph of waves, in shades of pink

My family is small and noisy: me, my wife, who joins me on every adventure, and Yami and Yume, my cats, who are almost my kids.

Yami and Yume, my cats, among pink flowers
My wife and I in the snow, with mountains behind us and motion trails

If you're trying to bring order to something that needs to scale, we probably have something to talk about.

Let's talk. Get in touch ↗