Worked on improving the reliability of PTF-based packet testing in the sonic-net/sonic-mgmt repository, focusing on test_fib.py and related test workflows. Addressed a recurring AssertionError in test_hash by fixing packet formation logic and refining the parameter order in check_ipv4_route(), while also correcting the assignment of ipinip_pkt in check_ipv6_route() for more accurate IPv4 and IPv6 route validation. These Python-based changes, implemented within the Ansible-driven test framework, enhanced the stability of continuous integration and reduced debugging time for network validation tests. The work demonstrated strong skills in Python, networking, and automated testing within a complex codebase.