Mayara Castro, Product Designer & UX Engineer

I’ve worked between design and engineering since 2019. I started as a front-end developer, built design systems at Warren, at Renner and, through Meiuca, for Itaú and BV, and at Appmax I took over the design and the code of the websites and internal tools. Today I design products, from research to screen, with a focus on accessibility.

Design and code · Design systems · WCAG AA accessibility · User research

Case studies

Three screens of the Sessão de Rua app: welcome, the Cinemateca Capitólio page and a screening’s details

Research · UI · App · 2026

Sessão de Rua, an app for Porto Alegre’s street cinemas

A project from the UX do Zero ao Case course, made to practice user research: a survey with 30 responses, 2 interviews, ideation and a 12-screen app prototype that shows the listings of all four cinemas.

Daily view of Conciliação, a fictional product built with the design system: the week’s payouts, open items and a weekly summary. Interface in Portuguese

Design system · Appmax · 2026

One design system for Appmax’s three products

Six principles, tokens with a dark theme and 42 components, used by the design team and tested on a new product without creating a single color or style outside the system.

Month view of Calendário 360, with content pieces colored by project on each day. Interface in Portuguese

Product · Internal tool · 2026

One calendar for three brands’ content

An internal tool I designed and built, used every day by about 12 people on the marketing content team, with access roles, a roadmap and a Jira integration.

Top of the Black Friday landing page, with the headline, an email field and a phone showing the approval rate. Interface in Portuguese

UI · Process · Appmax · 2026

A Black Friday landing page to sign up merchants

Design and code for the campaign’s merchant sign-up page, which moved out of the main website and got the email field at the top. Launched on September 25, 2026.

Top of the Max homepage, with the headline “Max, your digital account with Artificial Intelligence”. Interface in Portuguese

UI · Max · 2026

A new homepage for Max

Redesign of the homepage of an AI-powered digital account for individuals and businesses, from concept to shipped code.

Storybook of the multi-brand design system in Vue, with the component list and the Start here page

Design system · Code · 2022

A multi-brand design system in Vue

A take-home test for Meiuca’s hiring process in January 2022: starting from the Figma layout, I built the tokens, the multi-brand components, the Storybook and the visual tests.