# Mid-level Software Development Engineer in Test (SDET)

> 99x Brazil · São Paulo, Brazil (Remote) · Full-time · Posted 2026-08-28

**Workplace:** remote

## Description

We are seeking a Mid-level Software Development Engineer in Test (SDET) focused on testing web and mobile applications in the online banking domain. 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.

## Requirements

-   B2 English proficiency
-   4+ years of automation engineering or software development experience
-   Strong coding skills and automation framework experience
-   Experience with API testing and automation frameworks
-   Experience working in CI/CD environments
-   Experience testing web UI applications 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.
-   Experience clearly articulating issues and collaborating across teams.
-   Experience in the banking or fintech industry is a plus.

## Benefits

-   We provide resources for you to grow and learn on the job, including online courses, mentoring, and the latest gen laptops;
-   A fully remote work environment with flexible working hours;
-   Bonus for any referrals that we end up hiring.

## Apply

[Apply at 99x Brazil](https://apply.workable.com/99xbrazil/j/0655F82AED/apply)

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