When you refer developers to Circular –either via email or sharing your referral link– they have to give consent and signup in order to join Circular and start receiving interview invitations (i.e. Circular is 100% opt-in for developers you refer).
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If you refer them via email and they decide not to sign-up, we never contact them again. We wouldn't be able to contact them even if we wanted to, because we don't store these email addresses beyond 24 hours.
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If you shared your referral link (outside of our platform) with a developer and they decide not to sign-up, we don't have any information about the developer.