Online Test portals for developers

I have attended test on nline platforms like IKM, TestDome, HAckerRank. But it seems they only work with recruiters.

I am looking for an portal/platforms that allowes develoers/programmers of different languages to pay and do a test to periodically check their competence.

Does anyone of you know about any such sites/portals? I have been looking for a while without much success. Last I checked with IKM they told that they don't work with candidates yet.

Regards, Anupam