What is the purpose of a technical lead engineer, software architect, software developer, designer, quality engineer, and SEO expert? Do I need everyone on my team to build a high end, very complicated application?

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These roles gradually evolve out of existing developer roles as the needs become clear. In the beginning software teams typically consist of one or more devs who just do everything. There generally is never enough resources to get everything done, so careful management and marshaling of resources is