Software Engineer in Test – C# / WPF

CaseGuard•Arlington, VA

12d

About The Position

We are seeking a detail-oriented and driven Software Engineer in Test to join our desktop application team. This role is focused on ensuring the quality and reliability of our WPF-based application through a combination of manual UI testing, automated test development, and integration testing. You will champion quality throughout the development cycle and own the release-readiness signal, working closely with developers to build a robust testing culture and infrastructure.

Requirements

Bachelor's degree in Computer Science, Software Engineering, or a related field, or equivalent professional experience.
2+ years of experience in a software testing, QA engineering, or SDET role.
Proficiency in C# and experience with .NET Framework.
Hands-on experience writing and maintaining unit tests and integration tests using frameworks such as MSTest, NUnit or xUnit.
Experience performing manual UI testing for desktop or complex GUI applications.
Familiarity with WPF concepts (data binding, MVVM pattern, control hierarchy) sufficient to navigate and inspect the application under test.
Strong attention to detail and a methodical approach to reproducing and documenting issues.
Ability to work independently, prioritize effectively, and collaborate with cross-functional teams.

Nice To Haves

Experience automating WPF or Windows desktop UI interactions using tools such as FlaUI.
Demonstrated practice of test-driven development (TDD) or behavior-driven development (BDD).
Experience integrating automated test suites into CI/CD pipelines (e.g., GitLab CI, GitHub Actions, Azure DevOps).
Familiarity with performance profiling and identifying UI responsiveness or rendering bottlenecks in WPF applications.
Experience with SQL or embedded databases used by desktop applications.
Knowledge of accessibility testing standards and tools for Windows desktop applications.
Familiarity with static analysis or code quality tools in the .NET ecosystem.
Experience introducing test coverage to a large legacy codebase.

Responsibilities

Design, develop, and maintain test cases, integration tests, and end-to-end test suites for a WPF desktop application built with C# and .NET Framework.
Perform thorough manual UI testing, including exploratory testing to surface edge cases and regressions.
Automate UI interactions and workflows using desktop automation frameworks (e.g. FlaUI) to build a reliable, repeatable test suite.
Verify media outputs: frame-accurate redaction checks, golden-file comparisons, and tolerance-based validation of AI detection results across GPU and CPU execution paths.
Collaborate with developers and product teams to understand feature requirements and define testable acceptance criteria.
Identify and document bugs with clear reproduction steps, root-cause analysis, and priority assessment; create and track bug tickets through resolution.
Participate in code reviews to provide input on testability, coverage gaps, and quality standards.
Contribute to a test-driven development (TDD) culture by writing tests alongside feature development and advocating for testability in design decisions.
Maintain and improve CI/CD pipeline integration so automated tests run consistently on every build.