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Gabriel Castro

@gabrielcastro3

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QA Automation Engineer at 300 Softwares who built 2,917 tests across three production systems.

Brazil

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What I'm looking for

I’m open to QA Automation, Senior QA Automation, and SDET roles. I’m based in Brazil and experienced working remotely with US teams.

At 300 Softwares, I was the sole owner of test automation for Everchain, a US fintech platform handling billion-dollar transactions. I built its end-to-end suite from scratch across three production systems, bringing it to 2,917 automated tests.

I migrated part of the suite to Playwright and split test runs by type, reducing daily test runtime by 40%. Moving key validations to database and API layers cut flaky tests by 75%.

I orchestrated 40–50 daily Azure DevOps pipelines and set Allure as the reporting standard. I also kept the suite stable through an Auth0 overhaul, a GraphQL-to-REST migration, and replacement of the UI library.

I designed an AI-integrated QA workflow using Claude, Claude Code, and Playwright MCP, and trained a manual tester who went on to handle 20%+ of our automation each sprint. I’m open to QA Automation, Senior QA Automation, and SDET roles, and have experience working remotely with US teams.

Experience

Work history, roles, and key accomplishments

QA Automation Engineer

300 Softwares

Sep 2021 - Sep 2026 (5 years)

Contracted through 300 Softwares as the QA Automation Engineer for Everchain, a US fintech platform in the debt-sale and receivables space (SOC 2, billion-dollar transactions). I was the sole owner of test automation and made the key calls on architecture, coverage, and tooling.

• Built the E2E suite from scratch across 3 production systems: 2,917 automated tests, taking the platform from no syst

Co-Founder & Tech Lead

Grupo Eleven

Mar 2014 - Dec 2025 (11 years 9 months)

Worked as Co-Founder & Tech Lead at Grupo Eleven.

Sports Photographer

Gabriel Castro

Jun 2011 - Dec 2021 (10 years 6 months)

Sports photographer and ESPN Brasil correspondent in Belo Horizonte, and photographer of the book "O Atleticano Vai ao Paraíso". Covering live events under tight deadlines sharpened the attention to detail and the eye for the unexpected that I now bring to software quality.

Programmer & Web Designer

300 Softwares

Sep 2017 - Sep 2021 (4 years)

• Developed web-based applications and ran functional testing to ensure system stability and performance
• Bridged design and development using Figma and Adobe Creative Suite, ensuring technical feasibility and high UI/UX standards
• Worked on front-end refinements and troubleshooting using JavaScript and PHP

Education

Degrees, certifications, and relevant coursework

PUC Minas

Postgraduate Specialization, Software Quality Engineering and Testing

2026 - 2027

Ultima School

Course/Certificate, Software Testing / QA

2021 - 2021

Training in software testing and quality: current testing theory, the software development lifecycle, object-oriented JavaScript programming, unit testing, and test automation with Selenium WebDriver.