If you notice any issues with CircleCI you can submit a support ticket. With the support ticket try to include any additional information that would help us triage the bug. Screenshots, steps to reproduce (if possible), and producing HAR files can help speed up identification and resolution of bugs. We currently do not have a bug bounty program.
If you feel that a feature should work differently than it does now, or have suggestions for new features you can add them to our ideas page. Our product teams regularly review the feedback and change requests.