During April 2025, this developer enhanced the QuesmaOrg/quesma repository by implementing client certificate authentication for Elasticsearch and OpenSearch. The work focused on enabling TLS mutual authentication, allowing secure connections through the addition of TLS client certificate path support in both configuration and client creation processes. By integrating these changes using Go, the developer strengthened the security posture of the system, reducing the risk of credential exposure and streamlining secure deployments. The project demonstrated skills in API integration, backend development, and configuration management, with a particular emphasis on secure design and seamless integration with Elasticsearch and OpenSearch environments.