Our company's project is toB, users also very few, so little in our code to handle concurrent logic, is also have no, I see other back-end wrote is the very foundation to add and delete,
But always the interview ask the problem of concurrency, I just want to ask these big companies like ali o written each interface should have concurrent processing, how they handle, small white haven't stayed in a big company, sincerely, our company is said to have come out from a big company, I think he wrote that is common to add and delete, no lock ah of what,