A technical co-founder would build this for you in a way that has both of your interests in mind. They will account for things like software repôs, that it’s designed and tested well, where and how it’s deployed and how it will be monitored and fixed once live. Who will get up at 3am when there are issues? There’s so much more to software development than paying some engineers to build something for you and as their interest is only financial you’ll have to pay them to do all those extra things too. If you take a co-founder on later they’ll probably want change things.