Worked on the NethermindEth/nethermind repository to enhance the reliability and maintainability of the test infrastructure. Focused on stabilizing precompile tracing within state tests by addressing a critical bug in the StateTestTxTracer, ensuring that tracing operations only occur when appropriate and improving the clarity of collection initialization. Improved test determinism by refactoring the logging system to isolate all test output to stderr, preventing log contamination of test results. Consolidated logger initialization and removed unused logging classes to streamline the codebase. Utilized C# and applied skills in debugging, refactoring, and unit testing to deliver more robust and maintainable test workflows.