'Full Stack Engineer' typically means that they are they are too lazy to hire for and/or define task specialization. You will be expected to have the skill sets of half a dozen different professions. Web developer, UI/UX engineer, Business Logic developer, back end development, Operations, Database Administrator, Tech support, AND you get to be on call to fix things when they break in the middle of the night... And the best thing? It is all your official responsibility and you will get blamed for everything.