[Job - 25102] Senior SDET - Software Development Engineer in Test, Brazil

We are **tech transformation** specialists, uniting human expertise with AI to create scalable tech solutions. With over 7\.400 CI\&Ters around the world, we’ve built partnerships with more than 1,000 clients during our 30 years of history. Artificial Intelligence is our reality. We seek an Senior SDET to grow API test coverage and performance scenarios focused on application security. This role partners with the API \& Performance Frameworks lead to author and maintain high\-value tests across critical services, ensuring resilience and reliability at scale. It also includes supporting developers with unit and integration testing. We value self\-starting, self\-driven and proactive engineers who thrive in a fast\-paced, startup\-like environment and can adapt to frequent changes in direction.**Responsibilities** Author and maintain API test cases using existing contract and integration frameworks, expanding coverage across high\-traffic endpoints. Develop and execute negative, edge, and performance scenarios to ensure robustness against unexpected inputs and loads. Maintain and evolve test data fixtures for APIs to support integration and regression runs. Collaborate with the framework lead to integrate authored tests into CodeBuild/GitHub CI pipelines, contributing to reliable release gates. Use tools such as k6 (or equivalent) to author and extend load/performance test profiles. Ensure service\-level gates are enforced (e.g., p95/p99 latency, throughput, error rate) by incorporating performance checks into test suites. **Qualifications** Proven experience in API testing (REST/GraphQL/gRPC), including automation and contract/integration test development. Familiarity with consumer\-driven contract testing and service\-level validation. Experience with performance/load testing tools (e.g., k6, JMeter, Locust) and interpreting performance metrics. Strong background in JavaScript/TypeScript or Python for test automation. Hands\-on experience with CI/CD systems (e.g., GitHub Actions, AWS CodeBuild) and integrating test suites. Detail\-oriented with a passion for building scalable, maintainable test suites that improve software quality. **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.** 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.