About

I use data and research to understand why people come back to a product

Product Designer with 3+ years in B2B and B2C digital products, deciding with the team what is worth building.

My background in UX Research makes me start from the right problem: I run discovery end to end, from user research and data to a validated solution, and I've taken an app from zero to the app stores. Experience with Design Systems, accessibility and generative AI applied to the design process.

Brazil · 3+ years

Guilherme Domingues, wearing glasses and a light T-shirt, looking down.

Career

  1. Apr 2026 – present

    Remote (Malta HQ)

    Product Designer

    KTO Group

    I work on the Loyalty team, responsible for the experience of Clube KTO, the company's loyalty program.

    • I lead product discovery and look for the cause of churn and low engagement, which is often different from the problem that gets reported.
    • I turn behavioral data into design hypotheses that can be tested, and I prioritize the ones most likely to improve retention.
    • I work with the data team and the PMs to bring each finding into the product. I prototype and validate the solutions in Figma.
  2. Jan 2025 – Apr 2026

    Remote (São Paulo)

    Product Designer I

    Locaweb

    I worked in the Customer Center and Domain Registration squads, during a period when the design team grew from 6 to over 15 designers.

    • I redesigned the Customer Center, where customers pay invoices, change plans and buy services. The average time per action dropped from over 2 minutes to under 1.
    • Together with engineering, design decisions and optimizations made the most complex features load 59% faster (from 129s to 53s) and screens render 75% faster (from 24s to 6s).
    • I worked at Locaweb and KingHost at the same time. I had to prioritize carefully and switch between different products without losing depth in either.
    • I helped mature the design processes as the team grew.
  3. Jun 2025 – Apr 2026

    Remote (Porto Alegre)

    Product Designer I

    KingHost

    I worked on the SSL, Domain Registration, Financial Panel, Control Panel and KingApp products, critical systems where any friction turns into a support ticket or a lost conversion.

    • I led the discovery and design of KingApp, KingHost's service management app. It went from kickoff to the app stores in 5 months and is rated 5.0. It was the first app of its kind among Brazilian hosting companies.
    • Financial management was the feature users asked for most in the app, and it helped reduce late payments.
    • I designed responsive, accessible interfaces to remove friction points from the user's path.
    • Alongside PMs, developers and stakeholders, I worked on discovery and validated hypotheses with wireframes and prototypes of different fidelities before development.
    • I ran usability tests and cross-referenced the results with other qualitative data to support design decisions.
    • I took part in evolving the company's Design System and documented decisions so other teams could follow the same standard.
  4. Sep 2023 – Jun 2025

    Remote (Porto Alegre)

    UX Researcher

    KingHost

    I worked on discovery and applied research, bringing what data and users showed into product decisions.

    • I interviewed stakeholders and business teams to turn vague requests into clear product requirements.
    • I analyzed data and support tickets to understand where users got stuck.
    • I mapped user journeys with Service Design, which also looks at what happens off the screen, and turned friction points into product opportunities.

Toolbox

Skills

  • Product Design
  • Product Discovery
  • User Research
  • Usability Testing
  • Design Systems
  • Prototyping
  • Wireframing
  • UX/UI Design
  • Interaction Design
  • WCAG Accessibility
  • Service Design
  • Customer Journey
  • Mobile App Design
  • Design Thinking
  • Agile Methodologies
  • Generative AI for Design

Tools

  • Figma
  • FigJam
  • Miro
  • Jira
  • Notion
  • Hotjar
  • Google Analytics
  • Mixpanel
  • Maze
  • UserTesting
  • Claude Code
  • HTML/CSS (basic)

Languages

Portuguese
Native
English
Upper-intermediate

Contact

Shall we talk?

Available for Product Design and UX roles, including remote. If you have an open position or want to talk about a project, send me an email.

Let's talk