Mid Software Development Engineer in Test – C#/.NET

This position is open exclusively to candidates who are currently residing in Mexico. Before applying, we encourage you to review our open positions and make sure the location requirements match your current location. Candidates who are not currently based in Mexico will not be contacted for this opportunity.

Nexaminds is looking for a Software Development Engineer in Test (SDET) II to drive software quality through test automation, strategic test planning, and modern AI-assisted quality engineering practices. The ideal candidate has strong hands-on experience with C#, .NET, UI and API test automation, and CI/CD integration, along with the ability to independently own quality initiatives within a software development team. 

Qualifications we are looking for:

• 3+ years of experience in Software Testing, Quality Engineering, Test Automation, or a related technical discipline.
• Strong proficiency in C# and the .NET ecosystem.
• Hands-on experience designing, developing, and maintaining automated tests using Playwright, Selenium, or equivalent test automation frameworks.
• Experience with UI test automation and an understanding of automated testing practices.
• Understanding of CI/CD pipelines and experience integrating automated testing into software delivery workflows.
• Ability to design and execute test strategies based on product requirements, acceptance criteria, and risk assessments.
• Experience reviewing, maintaining, and improving automated test code to ensure reliability and maintainability.
• Ability to independently troubleshoot test failures, identify coverage gaps, and resolve automation issues.
• Experience with AI-assisted development or testing workflows, or willingness to develop proficiency within the first 90 days.
• Strong analytical, problem-solving, and communication skills.
• Ability to work independently and collaborate effectively with Software Engineers, Product Owners, and cross-functional teams.

Nice to have:

• Experience with RestAssured.NET or similar API test automation frameworks.
• Experience with API testing and validation.
• Familiarity with Azure DevOps or similar application lifecycle management tools.
• Exposure to agentic QA platforms, AI-generated test cases, or AI-assisted test automation workflows.
• Experience evaluating and refining AI-generated tests to ensure accurate coverage and alignment with acceptance criteria.
• Experience working in Human Capital Management (HCM), payroll, or regulated software environments.

Job Duties:

• Independently own software quality responsibilities for a development team, including test coverage, risk assessment, and test execution.
• Design and implement comprehensive test strategies aligned with product requirements, acceptance criteria, and sprint objectives.
• Develop, maintain, and refactor automated UI tests using Playwright and API tests using RestAssured.NET within the team's testing framework.
• Integrate and maintain automated tests within CI/CD pipelines to support continuous testing and reliable software delivery.
• Review and evaluate AI-generated test cases and automation outputs, identifying incomplete coverage, inaccurate interpretations of requirements, and unnecessary test duplication.
• Perform code reviews for automated tests developed by engineers and AI-assisted tools.
• Monitor test pipeline health, investigate failures, and maintain automation stability and reliability.
• Collaborate with Software Engineering, Product, and QA teams to identify quality risks and improve testing effectiveness.
• Identify opportunities to improve test coverage, automation frameworks, and overall quality engineering practices.
• Contribute to cross-team discussions, sharing testing insights, best practices, and opportunities for continuous improvement.
• Balance test coverage, execution efficiency, and development velocity to support timely delivery of high-quality software.