More specifically, the psychopaths that you're likely to run into in a tech company fall into this class.
There are certainly psychopaths who are hopeless at concealing the fact. These are typically the less smart ones, so you wouldn't meet them; they are more likely to be in and out of prison than your office.
There are also psychopaths who are just about perfect at pretending not to be, and have no intention of ever doing otherwise. You can work with one of those for decades, and never notice a thing unless something extreme enough to make 'acting normal' seem a long-term liability happens.
There are certainly psychopaths who are hopeless at concealing the fact. These are typically the less smart ones, so you wouldn't meet them; they are more likely to be in and out of prison than your office.
There are also psychopaths who are just about perfect at pretending not to be, and have no intention of ever doing otherwise. You can work with one of those for decades, and never notice a thing unless something extreme enough to make 'acting normal' seem a long-term liability happens.