It somewhat depends on the product, but in the beginning, I think the tech only matters inasmuch as it allows you to iterate quickly and build a product people love. It can be a spaghetti code tire fire underneath.

What really matters is market insight to understand what people want, design ability to give it to them, and sales/marketing to get traction. You do need a good engineer to pull this off, but they need to prioritize iteration speed, not engineering quality.