FelixAI LLC · Updated 2026-09-23
Our content standards
We aim to provide independently authored or appropriately licensed practice materials. Rights review and learning quality are separate checks.
Publishing review
Unreviewed legacy coding questions are unavailable for display, execution and AI input. We do not treat a public repository, a paid third-party account or an attribution link as automatic permission to redistribute a question.
Your submissions
Only submit materials you can lawfully use. Do not share confidential interview questions, employer secrets or another person’s private materials. New exercises should be independently written, not paraphrased copies of third-party questions.
Report a concern
Send support@cairn.so the page URL, a description of the material, your contact details and the basis for your concern. We will review the material and may restrict access during review. Do not send unnecessary sensitive documents.