Worked on stabilizing HTTP CORS handling in the aws-powertools/powertools-lambda-python repository, focusing on backend API reliability for cross-origin requests. Addressed a persistent issue where CORS preflight (OPTIONS) requests returned 500 errors by refactoring the HttpResolverLocal logic to delegate to the parent resolver, ensuring correct route matching and standardized CORS behavior. Used Python to streamline the codebase, removing redundant overrides and centralizing exception handling. This fix improved maintainability and reduced support incidents related to CORS failures. Applied skills in API development, backend development, and testing to enhance the developer experience for frontend integrations relying on AWS Lambda APIs.