Questioning Start-Up PE Buyout Firm

You haven't indicated how old/what year you are so flying a bit blind here. It's always worth interviewing somewhere if you don't have anything else, especially if you're just trying to get something on the resume for Freshman/Sophomore year so you have something to point to to demonstrate interest in future interviews. You could potentially use the offer (if you get one) to try and leverage something better. Long-term though this is not somewhere I could recommend anyone actually start their career if they have the opportunity to go elsewhere.   

As someone who covers software, a few immediate things jump out to me about the firm:

• Founder has 0 FT PE or IB experience (sure she worked with some PEs, but that's not the same), is 7 years out of undergrad (+ a 1yr MBA), and her longest tenure anywhere was as a consultant with McKinsey which, while a great firm, does nothing for building the kind of experience needed to actually run a PE firm well
• Founder spent a year operating in fashion not software - sure it was "digital transformation & corporate strategy", but I'm also biased against consultants since they always seem to fluff up what they're doing/how impactful it is by cherry picking good stats and hiding bad ones, even if they're from MBB
• Almost all the employees are student interns, even some of the "associates" - big red flag
• The majority of the employees are Chinese or Indian - this is not about their race, but they all look like they're foreign students with unimpressive backgrounds who are fairly young which is a classic sign of a startup PE firm using a ton of unpaid interns that are desperate to get their foot in the door to handle scut work & basic admin
• They advertise a ~90 day close - this can be hard even with an experienced team with good resources, which they appear to be neither 

I just can't imagine any smart LP putting money with these folks based on this shallow dive. But like I said, if you're a Freshman or Sophomore and have nothing better, no harm in giving it a shot. Worse case scenario it's more interview experience.