Contact us
Questions, feedback, or a collaboration idea? Here is how to reach us.
For billing, refunds, privacy or data requests, security-sensitive issues, or anything that includes private account details. We usually reply within a few business days.
Use the public feedback repo for platform bugs, video playback issues, GitHub collaboration flow questions, and feature or course requests. Please do not post personal, payment, token, or private repo details there.
Course content & purchases
Questions about a course, section, lesson, or material before or after you buy.
Payments & refunds
Billing questions, or to request a refund. Refunds follow the policy in our Terms and are processed by our team — reach out and we will help.
Content & competitive-programming ideas
Suggest a topic you want covered, or a contest problem you would like broken down.
Training & teaching
We also offer training and guest teaching — for example, helping a school coach its competitive-programming team. Get in touch to discuss.
Privacy & data requests
Access, correct, or delete your data — see the Privacy Policy for details.
Bug reports
Something broken? Tell us what you did and what happened.