There are always 2 way to build a great product for any startups.

1. Assemble team of genius engineers. Give them freedom, trust their instincts and skills. Only thing is difficult to find genius engineers
2. Work on your development plan. Find out function points. Break down things into smaller things. Implement quality assurance processes. Problem is it takes away coolness in the startup environment.

Both ways have proven to yield results.  It’s your choice whether you want to keep looking for genius or you want to start building with what is available at your disposal.