Worked on enhancing the reliability of the OS test suite in the virt-s1/os-tests repository, focusing on AWS environments with EFA-ENA network interfaces. Addressed a persistent issue with flaky PingPong tests by implementing a targeted bug fix in Python, which involved explicitly selecting the correct EFA fabric to accommodate changes introduced by newer Linux kernels and multi-fabric configurations. This approach improved test stability and ensured accurate network testing results. Leveraged expertise in AWS, Linux, and network testing to deliver a robust solution that reinforced the dependability of automated test workflows without introducing new features during the development period.