Worked on core improvements to PHP static analysis and gRPC client libraries, focusing on type safety and reliability. In phpstan/phpstan-src, addressed session handling correctness by updating SessionHandlerInterface::read to reflect its true return types, expanding static analysis coverage and reducing false positives for session-backed PHP applications. In Shopify/grpc, enhanced the PHP gRPC library by refining PHPDoc annotations for UnaryCall and ensuring global namespace qualification for stdClass, which improved type hinting and minimized naming conflicts. Leveraged PHP, C++, and static analysis tools to deliver targeted fixes and features, resulting in more robust codebases and a smoother developer experience for PHP clients.