It means you need know how to architect, integrate and hack/debug/write/patch whatever software, in the meantime you also need to do bitwise and shift of intege

It means you need know how to architect, integrate and hack/debug/write/patch whatever software, in the meantime you also need to do bitwise and shift of integers, balanced binary tree algorithm algorithms fast. The former you need for the real work, the latter you need for interview. You need cover both ends.