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Mid-level Software Development Engineer in Test (SDET) at 99x Brazil (formerly Nextly). We are seeking a Quality Engineer with a strong background in testing web and mobile applications, particularly in the online banking domain. The ideal candidate will have hands-on experience with automation frameworks—either UI or API—and a passion for delivering high-quality, secure, and user-friendly digital banking experiences. Experience with low-code/no-code automation platforms like Testim is a plus. You’ll be joining a fast-paced quality engineering team that values precision, collaboration, and continuous improvement. . Reponsibilities:. Develop and maintain custom test automation frameworks using open-source tools (e.g., Selenium, Playwright, Cypress).. Architect scalable and reusable automation solutions across platforms. . Implement advanced testing strategies including performance, security, and API testing. . Collaborate closely with developers to ensure testability and quality in code design.. Drive continuous improvement in testing practices and tooling across the organization.. Bachelor’s degree in Computer Science, Engineering, or a related field. . Advanced English. 4–6 years of automation engineering or development experience . Strong coding skills and automation framework experience . Experience with API testing and automation frameworks . Strong debugging and problem-solving skills . Experience working in CI/CD environments . Experience testing both web UI and mobile applications (iOS and Android). . Experience working with SQL databases for test data validation and backend verification. . Exposure to low-code/no-code automation platforms such as Testim is a plus. . Familiarity with AI fundamentals and AI usage in software testing . Strong understanding of QA methodologies, tools, and processes. . Familiarity with Agile/Scrum development practices. . Excellent communication skills, with the ability to clearly articulate issues and collaborate across teams. . Excellent problem-solving skills and attention to detail.. Experience in the banking or fintech industry is a plus.. Company Location: Brazil.