Article talks about the problem from a very high level and does not go into details. Things like what communication channel is being used to update riders and drivers, how to incorporate new drivers moving into the grid in nearest search results, use of driver location hash table is never discussed. Not enough to clear a system design interview at all 
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Hi @Naman_Mishra !!
Thanks for contacting us. This is an intermediate-level course, and the author assumes that the learner knows the basics of system design.
Happy Learning 