During December 2025, Thomas Hoerner focused on enhancing routing reliability within the symfony/symfony repository. He addressed a nuanced bug in the PHP-based Symfony framework, ensuring that numeric-keyed query parameters are preserved during URL generation rather than being renumbered or altered. His approach involved both a targeted code fix and the addition of regression tests, which validate the correct handling of these parameters and safeguard against future regressions. By increasing test coverage and reinforcing URL integrity, Thomas contributed to more stable client-side and SEO behavior. His work demonstrated depth in PHP, Symfony, and back end development within a complex codebase.