Joost van der Borg focused on enhancing the aws/aws-cdk repository by improving documentation for S3 event notifications. He updated outdated links and clarified docstrings in bucket.ts, ensuring developers could easily access accurate configuration guidance aligned with the latest AWS CDK user guide. Working primarily with TypeScript and leveraging his expertise in AWS S3 and documentation best practices, Joost’s contributions aimed to reduce misconfigurations and streamline onboarding for new users. His work demonstrated careful attention to detail and a strong understanding of developer experience, resulting in clearer, more maintainable documentation that supports faster adoption of S3 event notifications in CDK projects.