During April 2025, N.B. enhanced AWS SigV4 authentication in the curl/curl repository, focusing on improving reliability and debuggability for AWS API calls. They implemented targeted changes in C, refining URL encoding and canonicalization for query parameters and path normalization to ensure accurate signature generation. By adding verbose logging around the signing process, N.B. enabled more effective troubleshooting and clearer traceability of authentication issues. Their work leveraged skills in API development, AWS integration, and unit testing, resulting in more robust and interoperable AWS API requests. The depth of these changes addressed signature-related failures and streamlined debugging workflows for developers.