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📕 Here are some good solutions we found for this question:
Good overview: https://medium.com/%40sandeep4.verma/system-design-scalable-url-shortener-service-like-tinyurl-106f30f23a82
Good solution: http://designgurus.io/blog/url-shortening
Neetcode solution: https://www.youtube.com/watch?v=qSJAvd5Mgio
Another solution: https://blog.algomaster.io/p/design-a-url-shortener