10/10 is not needed, genuine resource pool would be an essence
Core technology -Unix and SQL is important and needed, if the resource know Big data concepts, Hadoop, Alteryx et al would be added advantage
Cloud experience and awareness is mandatory from create, Configure, and monitor perspective
As an SRE, the resource should have worked on monitoring tools in SRE such as Data dog, Splunk, they will work on Testing, creating environments, Support Production, deploying codes, CI/CD, Incident managements, troubleshoot
% wise-SRE 80% and 20 % Development as they grow in the System it would/could be 60:40 ratio
Also depends on the background of the resource for the % alignment