I was contacted by a headhunter through LinkedIn. I received an email from Motorola with a Codility challenge. One task was to return an array of integers which sum up to 0, given n (how many numbers). The second was to debug a code by changing only three lines in it. There were 55 minutes for those two.

Then I was invited for a 2-hour interview, both technical and "tell me about yourself."

How would you check if a file sent over the network has not been changed during this transfer?

Write (on paper) a method that takes in a long and returns true if its binary representation has an even number of 1s, false otherwise. Do not turn the long into binary (the trick was to use & with a bitmask, >> and a loop). Write unit tests.

Method to remove duplicates from a Map.

Write an SQL query to return data from Table1 when given an ID which is a foreign key from Table2 (inner join question).

Why use equals instead of == for comparing Strings?

Describe Unix commands:

• chmod
• grep
• top

How would you configure two network cards (inside one machine) so that one card is open to the internet while another isn't?

Describe Continuous Integration.

Scrum vs. Kanban.