Really all it is is "3 days to showcase you have a working compiler, ide, formatter, can run the tests, and are familiar with the CR tools".
The rest of it is learned (hopefully quickly) through the CRs, and any senior engineer should be comfortable making a few idiomatic mistakes in their CRs that they learn from.
The rest of it is learned (hopefully quickly) through the CRs, and any senior engineer should be comfortable making a few idiomatic mistakes in their CRs that they learn from.