Google and LinkedIn are two sites where sourcers spend most of their time. Both support Boolean search. Yet it works in very different ways.
The search is not really Boolean (we can call it pseudo-Boolean).
Google finds synonyms to all terms entered without quotation marks. A search like backend java engineer -engineer returns results while “formally” it should not.
The order of words matters, too; Google attempts to interpret words following each other as phrases. Searching for a sentence from a public page even without the quotes will return that page on top.
Google also attunes the