QA Analyst - Oracle to NET C# Migration & Hybrid System Testing

QA Analyst – Oracle to NET (C#) Migration & Hybrid System Testing Location: Nottingham/ London - Hybrid Length: ASAP – Jan 2026 (6 months) Rate: £450 Hours: 9-6pm About the Project We are modernising a legacy enterprise system built on PHP and Oracle, transitioning to a modern .NET (C#) architecture. This transformation involves re-engineering over 240 Oracle stored procedures and decoupling critical business logic from the database into the application tier, while continuing to support business-as-usual operations throughout a phased migration.  The existing Oracle database will be migrated to Postgres or MySQL and testing this will be critical. This is not a simple platform swap it’s a structural and functional re-architecture that requires careful validation to ensure that behaviour, data integrity, and business rules are preserved. The QA Analyst will play a key role in validating the equivalence of the new system, ensuring that both legacy and re-implemented components function correctly in parallel during the transition.Key Responsibilities

• Develop and execute detailed test plans and test cases across both the legacy Oracle-based platform and the new C#/.NET services.
• Validate that the re-engineered C# logic faithfully reproduces the functionality of existing Oracle PL/SQL procedures, triggers, and packages.
• Perform end-to-end data validation to ensure consistency and correctness during the migration.
• Collaborate with developers, DBAs, and business analysts to extract requirements, define expected behaviour, and identify test coverage needs.
• Support regression, integration, and system-level testing in a hybrid environment where both platforms co-exist temporarily.
• Assist with implementing or optimising automated testing tools and frameworks to enhance test repeatability and efficiency.
• Document test outcomes clearly, raise defects with actionable detail, and contribute to tracking and resolution workflows.
• Help shape QA best practices and contribute to quality standards for phased migration projects.

Required Skills & Experience

• 3+ years of experience in software quality assurance, with involvement in enterprise-scale or migration-driven initiatives.
• Strong understanding of database-centric testing, including SQL querying, data reconciliation, and stored procedure validation.
• Familiarity with Oracle PL/SQL and experience validating its logic during transformation into .NET-based systems.
• Experience in migration of databases.
• Proficient and experienced in developing test plans comparing legacy and new system results to ensure no issues once a solution has migrated to the new platform/s.
• Experience working in hybrid environments where legacy and modern components run in parallel.
• Proficiency in designing and executing both manual and automated backend and integration-level tests.
• Strong attention to detail, analytical thinking, and problem-solving skills.
• Clear communicator, comfortable working across cross-functional teams and documenting complex scenarios.

Desirable Skills

• Exposure to QA in both PHP and .NET environments.
• Experience with test automation tools or frameworks (e.g., Postman, Selenium, JMeter, or similar).
• Familiarity with AI-assisted tools for test generation, code analysis, or quality monitoring.
• Understanding of ETL processes and experience validating data transformations or pipeline behaviours.
• Background in agile delivery methods and working within sprint-based or iterative development cycles.

What We Offer

• A pivotal QA role in a high-impact digital transformation.
• The opportunity to work on both legacy and next-generation systems simultaneously.
• A collaborative, detail-driven team environment focused on delivering quality at scale.
• Exposure to modern development practices and AI-enhanced tooling.