[codingdave]

I've found that tech leads grow organically as a team grows. The go-to guy who knows the products and the tech, and to whom everyone go with questions, if they also have leadership skills and like to help other, ends up falling into that role almost by accident. Whether it becomes formalized or not depends on the organization. I don't think you need to inject a tech lead role onto a team that hasn't already informally started using one.