Late answer but I'll give it a shot. Ja, vi gör alltid det sounds ok (and is an accepted answer) but Ja, vi gör det alltid sounds off, I can't imagine a context for it. I think it's the kind of expression that while it may be used in some cases, it's so rare that it shouldn't be accepted in a course for beginners.
On the other hand, det gör det alltid is perfectly normal. Like, Regnar det? Ja, det gör det alltid. 'Does it rain? Yes, it always does.' But that's a totally different construction where the subject is actually the second det, not the first one (in vi gör det, the subject is of course vi).
PS the reason alltid wants to go before the object is that it's a satsadverbial 'sentence adverbial' which modifies the whole sentence, and those like to go in the so called "fourth place". More about word order here: https://www.duolingo.com/comment/8970470
Tack!! That makes a lot of sense in a time perspective, "we always make it (in time)." Would "jag, det gör vi alltid" make sense if the context was regarding actually making something physical (eg. Pottery hehe) such as "yes, we always make it (referring to clay pots)"? Thanks!!! :)