Worked on the apache/answer repository, focusing on backend development and API security using Go. Delivered a targeted security fix to the Best Answer Access Control mechanism, ensuring that only answers associated with the current question could be marked as the best answer. This was achieved by implementing server-side validation in the AcceptAnswer method, specifically verifying that the accepted answer’s question ID matched the request’s question ID. The update mitigated privilege escalation risks and improved data integrity within the answer acceptance flow. The approach emphasized security best practices, resulting in clearer auditability and a maintainable validation path for future development.