[code]

That doesn't address his question. It addresses what every "founder" should have, not what determines a technical cofounder...

OP, I think as long as you can build what you're trying to build and it's solid without serious issues, you're good enough. Most founders will end up hiring more technical people on to help with complex algorithms and such down the road. Not every technical founder have say, a PhD in Machine Learning for example, to build a complex semantic search engine (random example). As long as you're confident in your code to an extent to get the company up and running and be able to lead a technical team, you're probably good enough to call yourself a technical cofounder.