What appears to be a focus purely on beating Shopify, at all costs - encouraging a way of working that seems to be short-sighted, and is building up the (already large) technical debt pile into an even bigger one. The term "exponential growth" comes to mind.
As far as the perks go - it's all mostly for show. The games room is more something to lure new candidates with than an actual games room - it's empty almost all the time except very late in the evening - yes expect long hours when you join up.
When I started they offered "working from home is okay", and "flexible working hours are part of the culture". Expect funny looks from management if you actually decide to actually take up on any of those offers, unless of course you yourself are in a management role - then yes it's all good.
Since the new CPO, things changed a lot; major changes in spending - (they're cutting down on staff: offering a 10-week payout if you decided you don't want to stay etc.), while trying to get more work out of the ones that stay. Here is a summary of the changes condensed into what was preached in a company meeting a little while ago (actual quotes): "work smart, not hard" is now "work hard *and* smart", "quality not quantity" is now "quality *and* quantity". As a result, expect "flexible working hours" to be "long working hours".
I have some friends who work at Shopify, and from talking to them, it's not really that much of a surprise that Shopify have dominated Bigcommerce - let's see if Bigcommerce can reverse the tides - I am hopeful, but I'm at least skeptical too. Oh, and pretend to get excited about their war campaign - "Operation Stompify" >.>