S&T summer to IB

I'm a junior at a target school with a 3.7+ with a highly technical degree (engineering/CS). As of now, I'm committed to S&T at a mid-BB (BAML, Barclays, Citi, CS). I am pretty sure I'll end up on a good desk given my skillset and be sought after as an intern despite the cuts and decline of S&T.

I also really do enjoy the markets and am thrilled to have this offer many would love. However, I think I made a mistake in not realizing that I do not want to be in the markets my whole career, and that I would love to go into technology/startups/product after a few years. As a result, exit opportunities, which is a weakness of S&T, is something I should have but did not optimize for while recruiting.

I am going to do my absolute best to get a return offer, although when the dust settles I do not think I'll be in S&T full-time. I think my best chance to pivot is through internal moves at my firm to IB, but I wanted to know how exactly I should make this transition. I figure preparing will be as standard as IB interviews.

Of course, I also plan on preparing for consulting, etc, but I figure IB is most relevant to this forum.

Thanks in advance.