João Araujo

About

Email meRésumé

years in digital accessibility

6+

countries where the assistive technology I co-invented is patented

5

working languages: Portuguese, English, and Libras

3

Experience

1. Jul 2026 to present

   Accessibility Testing Specialist

   Keeggo, for Caixa

   • Run manual and automated accessibility audits against WCAG 2.2 AA on web and mobile apps for a Brazilian bank.
   • Test with NVDA, JAWS, VoiceOver, TalkBack, and keyboard-only navigation, documenting each issue with reproduction steps and severity.
   • Write remediation specs and code-level recommendations covering semantic HTML, ARIA, focus management, and contrast.
   • Train cross-functional teams on inclusive design practices and accessibility acceptance criteria.

   • WCAG 2.2
   • NVDA
   • JAWS
   • VoiceOver
   • TalkBack
   • axe
   • Lighthouse

2. Dec 2025 to present

   Course Instructor, Specialization in Deaf Education

   Federal University of São Carlos (UFSCar), SEaD

   • Teach Mathematics Teaching for the Deaf in the bilingual-approach specialization.
   • Teach Libras and Portuguese translation and interpretation for STEM.

3. Aug 2021 to Jul 2026

   Quantitative UX Researcher and Digital Accessibility Consultant

   FIPT, for Lenovo

   • Led UX research and defined specifications for 20+ accessible features with development, AI, and QA teams in a Scrum environment.
   • Co-invented an assistive technology for Deaf signers, patented in Brazil, the USA, the EU, China, and Japan.
   • Co-created bilingual Libras and Portuguese surveys with 200+ Deaf participants, and ran 50+ usability tests and interviews.
   • Built 5+ data-driven proto-personas from 190M+ Brazilian census records to guide inclusive product design.
   • Delivered 50+ trilingual presentations and trainings on digital accessibility and D&I.

   • R
   • Excel
   • Scrum
   • Usability testing
   • Libras

4. May 2025 to Aug 2025

   Full Stack Developer

   LUZ Soluções Financeiras

   • Automated a multi-step financial process, cutting processing time from 2 hours to 15 minutes.
   • Improved database query performance by 75% and reached 90%+ unit-test coverage.

   • Python
   • Django
   • C#
   • .NET
   • PostgreSQL
   • Oracle

5. Apr 2024 to Nov 2024

   Math Content QA Consultant and Dashboard Specialist

   Duolingo

   • Ran accessibility testing in 5+ courses on web and mobile with NVDA, TalkBack, VoiceOver, Lighthouse, and Accessibility Scanner.
   • Wrote reports with WCAG considerations to improve user flows and component accessibility.
   • Localized 40+ Math units and 50+ accessibility-related strings for the launch of Duolingo Math in Portuguese, a product with 100M+ monthly active users.

   • NVDA
   • TalkBack
   • VoiceOver
   • Google Apps Script

6. May 2024 to Aug 2024

   Quantitative UX Researcher and Product Analyst

   Avenue Code, for Braskem

   • Ran 10+ B2B usability tests and user interviews to identify critical pain points.
   • Built 20+ UX metrics dashboards and led an NPS analysis that identified 5+ improvements.

   • Pendo
   • Power BI

7. Mar 2019 to Dec 2019

   Researcher, Deaf Education

   FAPESP

   • Adapted a math anxiety scale for visual and linguistic accessibility for Libras users, ran 100+ accessible questionnaire sessions with Deaf students, and analyzed the results in R.

Volunteering

1. Aug 2026 to present

   Data Science Volunteer

   Mapa Autismo Brasil

   • Member of the data science team building a national dashboard on autism data in Brazil.

2. Aug 2025 to present

   Digital Accessibility Volunteer

   Movimento Web Para Todos

   • Promote digital accessibility and a more inclusive web ecosystem in Brazil.

3. 2018 to 2019

   Volunteer Math Tutor

   Associação dos Surdos de São Carlos

   • Tutored Deaf students in math and helped organize the first Fórum de Direitos Humanos Surdos.

Projects

Selected work across accessibility, research, and front-end development.

Showing 9 projects

• Virtual sign language system

  An assistive technology for Deaf signers that I co-invented at FIPT for Lenovo. Patented in Brazil, the USA, the EU, China, and Japan.

  • Accessibility
  • Research

  Google Patents

• Duolingo Math in Portuguese

  Localization of 40+ Math units, plus screen reader testing on iOS, Android, and web ahead of the Portuguese launch.

  • Accessibility

  Duolingo Blog

• Proto-personas from census data

  Clustering 190M+ Brazilian census records into proto-personas that guided inclusive product design for Deaf users.

  • Research
  • Data

  ACM Digital Library

• Counting Deaf signers in the Brazilian census

  My master’s dissertation on how census surveys quantify Deaf people who use sign language, and what that means for inclusive policy.

  • Research
  • Data

  UFSCar Repository

• Toast component

  A toast notification component in React, built during The Joy of React by Josh W. Comeau.

  • Front-end

  GitHub

• Word game

  A Wordle clone in React, built during The Joy of React by Josh W. Comeau.

  • Front-end

  GitHub

• Sole & Ankle

  A responsive e-commerce layout, built during CSS for JavaScript Developers by Josh W. Comeau.

  • Front-end

  GitHub

• Accessible document tutorials

  Videos for UFSCar’s accessibility portal on converting documents into accessible formats, with Libras interpretation.

  • Accessibility

  YouTube

• Data analysis projects

  Data cleaning, analysis, and visualization projects in SQL, R, Python, and Power BI.

  • Data

  GitHub

Skills

Education

1. Jul 2025 to present

   Bachelor of Technology in Data Science

   UNIVESP

2. Feb 2020 to Jun 2023

   Master’s degree in Special Education

   Federal University of São Carlos (UFSCar)

   Dissertation: Reflections and possibilities on the quantification of signing deaf people in Brazilian census surveys.

3. Feb 2016 to Dec 2019

   Bachelor’s degree in Physics

   University of São Paulo (USP)

Contact

Email is the fastest way to reach me. You can also find me on LinkedIn and GitHub.

• Résumé
• LinkedIn
• GitHub
• Frontend Mentor
• YouTube