I don't think a person has to be super specific or say "I am interested in X and Y." What they do need is consistency in a resume so the reviewer/interviewer

I don't think a person has to be super specific or say "I am interested in X and Y." What they do need is consistency in a resume so the reviewer/interviewer can evaluate what their primary and secondary focus areas are. Sometimes you have to leave stuff out. For example, Data Scientists typically don't deploy and maintain a Data Science stack unless it's a really small company. And a Data Science Infrastructure person at a bigger company probably isn't analyzing data unless they are just playing around to validate their stack. But if you have a resume (or say this during an interview) that gives equal weight to the data analysis and the stack deployment, it's just confusing to the person reading it. Especially in Data Science, which already confusing from a skillset perspective. Lots of resumes look like the applicants just thought 10 things with minimal overlap were cool and decided to put them on their resume. Even if you did work at a 5 person startup and had the unoffical title of "Data Scientist, Data Engineer, Data DevOps, DB Admin, and Chief Data Officer" I'd recommend you downplay some of those based on the jobs you are applying for. Figure out what is essential and what is +1