Worked on Symfony’s core repositories, focusing on backend PHP development and technical documentation. Delivered updates to the symfony/symfony-docs repository, clarifying NumberNormalizer behavior in Symfony 7.3 to ensure BcMath\Number and GMP values are normalized as strings, which improved upgrade guidance and maintained alignment with the Symfony Serializer changelog. Addressed XML serialization stability in symfony/symfony and symfony/serializer by fixing PHP 8.5 warnings related to NaN and INF values, implementing robust unit tests to ensure consistent behavior across components. Demonstrated a methodical approach to documentation, bug fixing, and test coverage, contributing to maintainable code and smoother developer onboarding.