This position is listed on behalf of a partner company, who manages all applications and next steps. Our partner is looking for a QA Automation Sênior based in Brazil. This is a senior quality engineering role focused on ensuring the reliability and performance of high-usage digital applications. You will work extensively with mobile testing across Android and iOS, as well as API validation and end-to-end automation. The role combines hands-on testing with technical investigation, risk identification, and continuous quality improvement. You will validate complex application flows, payloads, integrations, and GraphQL contracts while supporting robust CI/CD practices. Working closely with multidisciplinary teams, you will have significant autonomy to identify issues and propose effective solutions. Experience in large-scale retail, e-commerce, or high-traffic mobile environments will be especially valuable.