Ilya focused on backend development for the oat-sa/extension-tao-testqti repository, addressing a performance regression in the QtiRunner component. He reverted recent changes that had introduced latency, restoring the previous code logic to ensure faster and more reliable test execution. By switching service retrieval from an intermediate PSR container to direct ServiceManager usage, Ilya simplified the architecture and reduced overhead. This PHP-based solution improved the stability and throughput of continuous integration pipelines, resulting in more predictable test runs. Although the work centered on a single bug fix, it demonstrated a thoughtful approach to performance optimization and system reliability within backend systems.