Marketers usually won't understand what it takes to build a tech product. So, you need to make them understand that writing code requires solving complex problems and it takes time. Even the best programmers can't build shit overnight!

In fact you are the Rockstar of the project and it should stay that way (not taking credit away from your marketer partner). You guys should talk this over drinks. Without the right camaraderie no startup has ever succeeded.

PS: I am not a programmer