Andrew Stoth focused on enhancing the reliability of the Bitcoin Core functional test framework by addressing resource exhaustion issues related to excessive concurrency. Working within the bitcoin/bitcoin repository, he adjusted the default configuration to set the concurrency parameter to two, effectively limiting the number of threads spawned during test execution. This targeted change, implemented in Python and leveraging configuration management and testing expertise, reduced flaky test outcomes and stabilized continuous integration feedback. By linking the modification to a specific commit for traceability, Andrew demonstrated a thoughtful approach to infrastructure tuning, delivering a low-risk, high-impact solution that improved the overall stability of the test suite.