QA Automation Engineer - UI & API, C#/.NET

Mission.dev; United States; Remote; USD 110,000 - 150,000; Full time

Job summary

Mission.dev is seeking a QA Automation Engineer to own end-to-end testing for its security operations platform. You will build robust UI and API automation, maintain scalable test frameworks, and contribute to reliable CI/CD pipelines across an international team.

You will leverage C#, .NET 8, Selenium WebDriver, NUnit, and REST testing to validate complex JSON responses and ensure product quality for security professionals worldwide.

Qualifications

• Proven experience in software quality automation and test design.
• Strong skills in UI and API testing with modern frameworks.
• Hands-on with Selenium WebDriver, NUnit and REST APIs.

Responsibilities

• Develop and maintain automated UI test suites using Selenium WebDriver and C#.
• Design and execute REST API tests validating JSON payloads.
• Build and scale test automation frameworks with Page Object Model.
• Manage test data lifecycles and Cleanup processes.
• Isolate and troubleshoot flaky tests to stabilize CI/CD.
• Implement asynchronous and parallel testing to reduce execution time.
• Collaborate with engineers to integrate tests into deployment workflows.

Skills

C#

.NET 8

Selenium

NUnit

UI testing

API testing

Git

CI/CD

Parallel testing

Test automation

Tools

RestSharp

GitHub Actions

Allure

Job description

Mission.dev is seeking a QA Automation Engineer to own end-to-end testing for its security operations platform. You will build robust UI and API automation, maintain scalable test frameworks, and contribute to reliable CI/CD pipelines across an international team.

You will leverage C#, .NET 8, Selenium WebDriver, NUnit, and REST testing to validate complex JSON responses and ensure product quality for security professionals worldwide.