How else will you prove that YOU shipped those things over that period?
* Github account? Ha, my code is on github in many places, mostly without attribution, none of them uploaded by me.
* Recommendations? Ha. Unless the person recommending you already works at the company, their trustworthiness is zero - they could be a paid accomplice.
* Resume? Unless you were the sole employee, there is no way to tell how much actual work YOU did.
* "Tell me about that one time you solved an interesting problem?" Ha. Can easily be a well-practiced lie.
(yes i have seen all of the above)
Turns out that the only sure way to tell if you can do X, is to make you do X and watch you yourself actually do it, in person.
Now, I am not accusing YOU of fraudulently trying to get a job, but people do. An in person interview is a good way to see.
(as always, i speak for myself only, not my employer, my cat, or our Great Lord FSM)