At CI&T, we help large enterprises transform the potential of AI into real business impact with AI Deployment, AI-native execution, and tech-integrated business solutions. With 30 years of experience in technological transformation, we accelerate innovation with expertise in Agentic SDLC, Application modernization, Data & AI, Martech and Business strategy. We are 8,000 CI&Ters across more than 25 countries, collaborating to build solutions with real impact. AI is already part of how we work, evolve, and innovate every day. We're looking for a Senior QA Automation Engineer to join an international team building highly scalable payment solutions. This is an opportunity for someone who enjoys solving complex technical challenges and is passionate about quality, automation, API testing, and performance testing. WHAT YOU'LL BE DOING * Design, develop, and maintain automated test solutions. * Validate REST and GraphQL APIs. * Perform API contract testing to ensure compatibility between providers and consumers. * Execute functional, integration, and end-to-end testing. * Develop and execute performance and load testing using JMeter. * Collaborate closely with developers, Product Owners, and Scrum teams throughout the SDLC. * Identify edge cases, improve test coverage, and help drive quality from the early stages of development. * Investigate defects, analyze root causes, and support continuous improvement. WHAT WE'RE LOOKING FOR * Senior-level experience in QA Automation. * Advanced English (daily communication with international teams). * Strong experience with API testing using Postman. * Experience with Contract Testing (PACT or similar frameworks). * Experience with performance and load testing using JMeter. * Experience with REST APIs (GraphQL is a plus). * Knowledge of automation frameworks such as Cucumber, JUnit, Mockito, WireMock, and REST Assured. * Experience with mutation testing (PIT) is a plus. * Strong analytical and problem-solving skills. * Ability to think through edge cases and complex business scenarios. * Comfortable working in Agile environments. NICE TO HAVE * Experience in the payments or fintech industry. * Knowledge of security testing (DAST/OAT). * Experience working with CI/CD pipelines. Location: Hybrid – São Paulo, Brazil Language: Advanced English required #Li-MG4 #Midsenior Our benefits:   -Health and dental insurance -Meal and food allowance -Childcare assistance -Extended paternity leave -Partnership with gyms and health and wellness professionals via Wellhub (Gympass) TotalPass; -Profit Sharing and Results Participation (PLR); -Life insurance -Continuous learning platform (CI&T University); -Discount club -Free online platform dedicated to physical, mental, and overall well-being -Pregnancy and responsible parenting course -Partnerships with online learning platforms -Language learning platform And many more!   More details about our benefits here: https://ciandt.com/br/pt-br/carreiras   At CI&T, inclusion starts at the first contact. If you are a person with a disability, it is important to present your assessment during the selection process. See which data needs to be included in the report by clicking here.This way, we can ensure the support and accommodations that you deserve. If you do not yet have the assessment, don't worry: we can support you in obtaining it.   We have a dedicated Health and Well-being team, inclusion specialists, and affinity groups who will be with you at every stage. Count on us to make this journey side by side.