Blurring the lines is a senior engineer's job (though at a larger company, this may not happen until the next level up). It's how they grow the scope of what they deliver to the company.
I would be upset if a senior engineer told me that anything in the path of delivering the final product was not their job. Defining 'job' here as understanding something and communicating/helping address/fix with the appropriate team.
I would be upset if a senior engineer told me that anything in the path of delivering the final product was not their job. Defining 'job' here as understanding something and communicating/helping address/fix with the appropriate team.