[Job - 31028] QA with Security Fix Validation Expertise, Brazil

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. At CI&T, our rapid growth is fueled by the innovative solutions we create for our global clients. We are seeking a detail-driven QA  to safeguard quality on a security remediation squad serving a large US mortgage lender. Remediation at volume is where regressions hide, and you will be the control that keeps throughput from costing the client stability — proving each fix works and nothing else broke. Responsibilities: • Validate remediation fixes by confirming the vulnerability no longer reproduces and intended behavior remains intact. • Design and execute regression testing around each fix, focusing on the blast radius of dependency upgrades and configuration changes. • Build and maintain automated regression coverage for the areas the squad touches most frequently. • Define testable validation and closure criteria together with the developers so "fixed" is a verifiable statement. • Produce validation evidence the client's risk program can attach to closure records. • Execute testing across the client's AWS environments and verify deployment behaves consistently between them. • Raise quality risk early when a fix's scope is broader than it first appears. • Integrate automated tests into the client's CI/CD pipeline. Requirements: • Bachelor's degree in Computer Science, Information Technology, or a related field. • Experience as QA or quality engineering for web applications. • Good English communication skills (reading, writing, and speaking) — direct collaboration with a US-based engineering team. • Proven capability in both manual exploratory testing and test automation. • Test automation experience with a modern framework such as Cypress, Playwright, or Selenium. • API testing experience with Postman, REST-assured, or an equivalent tool. • Strong regression testing discipline, including the ability to scope what a change could have broken rather than re-running everything. • Comfort testing PHP web applications hosted on AWS, including the ability to read PHP well enough to understand what a fix changed. • Experience integrating automated tests into CI/CD pipelines. Nice to Have: • Security testing exposure — validating vulnerability fixes, OWASP-based test cases, and basic penetration testing concepts. • Performance testing experience with JMeter or k6. • SQL proficiency for data validation. • Prior experience on a remediation or technical debt squad. • Experience in mortgage or financial services. • Experience working with international clients. Join CI&T and be a part of our mission to ensure quality never becomes the trade-off for speed. If you have a passion for quality engineering and want to own validation on work that directly reduces a client's security risk, we want to hear from you! #LI-JM5