Demonstrating that you have enthusiasm for the role and a genuine interest in working for the company are both vital for the successful outcome of the interview.
Body language is important, smile, lean forward a little, keep eye contact and nod gently when someone is talking.
Asking questions about the role, team, company, clients and projects, these all show that you are interested. If you turn them into “involvement questions” then they are more powerful:
“Tell me about the team I will be working with?” smile
“What can you say about the type of projects I will be working on?”
“Where will I sit?”
“Who will I work with?”
“Who would you say would be the best mentor I could have from the current team?”
You must show that you are interested in the answer, to be really “ace it”.