Google Senior Software Developer Engineer interview questions

Been contacted by google in November, I've done the screening interview after 1.5 months. It went not really well and the recruiter managed to let me do another round of screening interviews and I passed. After 1 month they told me that the position is already filled, after another 2 months they call me for the final interviews (1 googliness and 3 technical) . All done remotely.

5 different interviews 4 technical interviews ask questions about data structure and algorithms, including graph traversals and prefix trees. The last interview was goodliness which was aimed at figuring out if I was a cultural fit.