Quality Assurance Engineer (Mid-Level) – Legacy .NET Systems

Techstra Solutions • Pittsburgh, PA

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About The Position

Techstra solutions is seeking a mid-level Quality Assurance Engineer to support and evolve a mission-critical, legacy .NET application that has been in production for over 20 years. This role blends hands-on testing execution with strategic quality thinking and is ideal for someone who can work effectively within the constraints of older systems while helping drive practical improvements to testing practices, tooling, and risk management. The ideal candidate is comfortable navigating undocumented behavior, tightly coupled code, and historical design decisions , and can partner closely with developers, product owners, and operations to ensure platform stability while enabling incremental modernization .

Requirements

• 8–10 years of experience in software testing or quality engineering.
• Hands-on experience testing .NET applications , particularly older or legacy systems.
• Strong understanding of manual testing fundamentals and test design techniques.
• Experience with test automation frameworks such as Selenium, Playwright, SpecFlow, NUnit, xUnit, or MSTest .
• Solid SQL skills for data validation and troubleshooting.
• Familiarity with source control systems (e.g., Git, TFS/Azure DevOps).
• Experience working in environments with limited documentation and significant technical debt .
• Strong analytical and problem-solving abilities.
• Comfortable asking questions, challenging assumptions, and investigating why systems behave as they do .
• Ability to balance speed, risk, and quality when supporting release decisions.
• Clear written and verbal communication skills, especially when explaining risk to non-technical stakeholders.
• Self-directed and comfortable working independently while collaborating within established teams.
• This is a full-time, W2 salaried position .
• Applicants must be legally authorized to work in the United States now and in the future without sponsorship .

Responsibilities

• Design, execute, and maintain manual and automated test cases for legacy .NET applications (WebForms, WinForms, WCF, early MVC).
• Perform functional, regression, integration, and system testing , with a focus on protecting critical business workflows.
• Validate fixes in areas with limited or no existing test coverage .
• Conduct data validation and backend testing using SQL Server.
• Investigate defects by reproducing issues, analyzing logs, and collaborating closely with development teams.
• Support release testing, production validation, and post-release verification activities.
• Assess existing testing practices and identify pragmatic, incremental improvements appropriate for a legacy environment.
• Help define and execute risk-based testing strategies , focusing effort on high-impact and high-change areas.
• Partner with developers to introduce or expand automated regression coverage where feasible.
• Advocate for testability improvements in legacy code during enhancements and refactoring efforts.
• Contribute to test documentation, knowledge sharing, and tribal knowledge capture .
• Provide input into modernization initiatives (e.g., strangler patterns, service extraction, CI/CD enablement).

What This Job Offers

• Job Type: Full-time
• Career Level: Mid Level
• Education Level: No Education Listed