Tech lead's can be a position where someone is considered the primary expert on a particular piece of technology but operates solo. It can be the case that the role involves teaching or nurturing others, but it is not a specific requirement. The reason this role might exist is if the person working it is an expert at a piece of technology that does not require a larger team, or if they must remain flexible and change assignments often. In that case, things like too many meetings and/or spending extra time doing PR reviews would bog things down.
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Tech lead's can be a position where someone is considered the primary expert on a particular piece of technology but operates solo. It can be the case that the role involves teaching or nurturing others, but it is not a specific requirement. The reason this role might exist is if the person working it is an expert at a piece of technology that does not require a larger team, or if they must remain flexible and change assignments often. In that case, things like too many meetings and/or spending extra time doing PR reviews would bog things down.