The difference is the screen
A CV that says STM32, FreeRTOS and CAN tells you very little on its own. It does not
say whether the person wrote that driver or inherited it, whether they ever had the board on the
bench, or what they did when it did not come up.
So we ask. Before a CV reaches you we have had a technical
conversation with that engineer, and the notes we send say what they actually did, in their own
words, with anything they could not answer marked as such.
If the shortlist is four people, it is because four people were worth your time.