Zynga Interview Experience | Set 1

Last Updated : 23 Jul, 2025

Round 1 (F2F 1.5 hour)

OS concepts - semaphors and fork
Average of two numbers , how do you handle over flow? and generalise the same for stream of numbers https://www.geeksforgeeks.org/dsa/average-of-a-stream-of-numbers/ and https://www.quora.com/How-can-I-compute-the-average-of-a-large-array-of-integers-without-running-into-overflow/answer/Umesh-P-Narendran?srid=icYD
Check if binary tree is symmetric ( structurally as well as value) http://www.geeksforgeeks.org/symmetric-tree-tree-which-is-mirror-image-of-itself/
missing number in array of n numbers - solved using xor
write a function for isPrime - O(?n) complexity
In client and server model, how to decrease reponse time - discussed various methods

Round 2 (F2F 1 hour)

what is REST? what could be the ways implemented before REST?
how authentication works? - discussion on cookies, OAuth
find all pairs that add up to give sum k in array of numbers
how hash works when key is a string?
what are advantages of sql and nosql dbs, distributed system concepts like sharding, replication, master-slave

Round 3 (F2F 1 hour)