With regards to startups with tech cofounders having more change for success - One thing I've been wondering lately is how a "technical cofounder" is defined?

With regards to startups with tech cofounders having more change for success - One thing I've been wondering lately is how a "technical cofounder" is defined? I graduated from my college with a degree in economics. My career thus far (in Internet startups and companies) has mostly been on the biz dev and marketing side. However, I have always created and managed websites on the side. I have a deep passion for hacking (more than biz dev & marketing) and I'm pretty good at it. So my question is - at what skill level can you be considered a technical cofounder? Do you have to be an expert-level coder on the cutting-edge of technology? Is there a cutoff point with skill level to where you would need a tech cofounder? I know when I create my first startup I will want a technical cofounder. It's not so much that I don't think I could get good enough to code a large-scale website, it's more that the biz dev and marketing stuff comes easily to me so why would I need someone else to do that?