I got the concept for the Killer-App.
And i need a dev team. No joke.

It would be better if you stated what your "killer app" is about, and what requirements you are looking for in a dev team.

Yes - but i'm looking for a interested dev that i can tell my concept.
But the following things i can say: Financle App with an blockchain based transaction and wallet system. The concept opens the way to bring in crypto in mainstream using.
Everything else i will tell a trusted and really interested dev.
(Im really sorry for my english)

Just having an Idea will not take you too long.It must be feasible both technically and financially.You should search linkedin to find someone expert in blockchain and discuss your idea with him