In a single sentence - WASTE OF TIME
First round - Technical Phone Interview (1 hr)
Second round - Technical Phone + Collabedit (1 hr)
Third round - Coding assessment (2 days)
Fourth round - Technical Phone with CTO
Fifth round - Phone interview with CEO
Sixth round - Phone interview with Product Lead
Then, if you are lucky enough, you will be called on-site for an entire day technical assessment.