A "Full stack developer" is either one of two people. 1. A person starting a startup and they are the tech lead on their website. 2. A person who liaisons wit

A "Full stack developer" is either one of two people. 1. A person starting a startup and they are the tech lead on their website. 2. A person who liaisons with other departments but is still the owner of the project. They know enough to perform the business duties and may ask for help or the system is simple enough. If your web app becomes big enough it will be extremely difficult to have engineers that know the whole stack but they could have enough to fix most problems and figure out to escalate.