Systems design: What is the system design of the Uber App?
Systems design: What is the architecture for the OLA?
Systems design: What is the software design of the LYFT App?
Arch diagram: https://imgur.com/a/c1Nkuvf
Answer to all of the above questions is here, though I have explained much about Uber's system design, but for interviews you can adopt the same answer to all of the cab aggregation services question.
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Good reads:
https://eng.uber.com/techstackpart...
https://eng.uber.com/techstackpart...
https://github.com/uber
https://eng.uber.com/schemalesspart...
https://github.com/uber/RIBs
https://eng.uber.com/mezzaninemigrat...
https://github.com/confluentinc/kafka...
http://highscalability.com/blog/2015/...
http://www.bgr.in/news/thisishowgo...